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-rw-r--r--src/backend/catalog/dependency.c15
-rw-r--r--src/backend/nodes/copyfuncs.c40
-rw-r--r--src/backend/nodes/equalfuncs.c36
-rw-r--r--src/backend/nodes/nodeFuncs.c42
-rw-r--r--src/backend/nodes/outfuncs.c36
-rw-r--r--src/backend/nodes/readfuncs.c44
-rw-r--r--src/backend/parser/analyze.c47
-rw-r--r--src/backend/parser/gram.y58
-rw-r--r--src/backend/parser/parse_agg.c7
-rw-r--r--src/backend/parser/parse_cte.c193
-rw-r--r--src/backend/parser/parse_expr.c4
-rw-r--r--src/backend/parser/parse_func.c3
-rw-r--r--src/backend/parser/parse_relation.c54
-rw-r--r--src/backend/parser/parse_target.c17
-rw-r--r--src/backend/rewrite/Makefile1
-rw-r--r--src/backend/rewrite/rewriteHandler.c18
-rw-r--r--src/backend/rewrite/rewriteSearchCycle.c668
-rw-r--r--src/backend/utils/adt/ruleutils.c47
18 files changed, 1300 insertions, 30 deletions
diff --git a/src/backend/catalog/dependency.c b/src/backend/catalog/dependency.c
index 2140151a6af..13257336249 100644
--- a/src/backend/catalog/dependency.c
+++ b/src/backend/catalog/dependency.c
@@ -2264,6 +2264,21 @@ find_expr_references_walker(Node *node,
context->addrs);
/* fall through to examine substructure */
}
+ else if (IsA(node, CTECycleClause))
+ {
+ CTECycleClause *cc = (CTECycleClause *) node;
+
+ if (OidIsValid(cc->cycle_mark_type))
+ add_object_address(OCLASS_TYPE, cc->cycle_mark_type, 0,
+ context->addrs);
+ if (OidIsValid(cc->cycle_mark_collation))
+ add_object_address(OCLASS_COLLATION, cc->cycle_mark_collation, 0,
+ context->addrs);
+ if (OidIsValid(cc->cycle_mark_neop))
+ add_object_address(OCLASS_OPERATOR, cc->cycle_mark_neop, 0,
+ context->addrs);
+ /* fall through to examine substructure */
+ }
else if (IsA(node, Query))
{
/* Recurse into RTE subquery or not-yet-planned sublink subquery */
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 21e09c667a3..65bbc18ecba 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -2589,6 +2589,38 @@ _copyOnConflictClause(const OnConflictClause *from)
return newnode;
}
+static CTESearchClause *
+_copyCTESearchClause(const CTESearchClause *from)
+{
+ CTESearchClause *newnode = makeNode(CTESearchClause);
+
+ COPY_NODE_FIELD(search_col_list);
+ COPY_SCALAR_FIELD(search_breadth_first);
+ COPY_STRING_FIELD(search_seq_column);
+ COPY_LOCATION_FIELD(location);
+
+ return newnode;
+}
+
+static CTECycleClause *
+_copyCTECycleClause(const CTECycleClause *from)
+{
+ CTECycleClause *newnode = makeNode(CTECycleClause);
+
+ COPY_NODE_FIELD(cycle_col_list);
+ COPY_STRING_FIELD(cycle_mark_column);
+ COPY_NODE_FIELD(cycle_mark_value);
+ COPY_NODE_FIELD(cycle_mark_default);
+ COPY_STRING_FIELD(cycle_path_column);
+ COPY_LOCATION_FIELD(location);
+ COPY_SCALAR_FIELD(cycle_mark_type);
+ COPY_SCALAR_FIELD(cycle_mark_typmod);
+ COPY_SCALAR_FIELD(cycle_mark_collation);
+ COPY_SCALAR_FIELD(cycle_mark_neop);
+
+ return newnode;
+}
+
static CommonTableExpr *
_copyCommonTableExpr(const CommonTableExpr *from)
{
@@ -2598,6 +2630,8 @@ _copyCommonTableExpr(const CommonTableExpr *from)
COPY_NODE_FIELD(aliascolnames);
COPY_SCALAR_FIELD(ctematerialized);
COPY_NODE_FIELD(ctequery);
+ COPY_NODE_FIELD(search_clause);
+ COPY_NODE_FIELD(cycle_clause);
COPY_LOCATION_FIELD(location);
COPY_SCALAR_FIELD(cterecursive);
COPY_SCALAR_FIELD(cterefcount);
@@ -5682,6 +5716,12 @@ copyObjectImpl(const void *from)
case T_OnConflictClause:
retval = _copyOnConflictClause(from);
break;
+ case T_CTESearchClause:
+ retval = _copyCTESearchClause(from);
+ break;
+ case T_CTECycleClause:
+ retval = _copyCTECycleClause(from);
+ break;
case T_CommonTableExpr:
retval = _copyCommonTableExpr(from);
break;
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index 5a5237c6c30..c2d73626fcc 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -2842,12 +2842,42 @@ _equalOnConflictClause(const OnConflictClause *a, const OnConflictClause *b)
}
static bool
+_equalCTESearchClause(const CTESearchClause *a, const CTESearchClause *b)
+{
+ COMPARE_NODE_FIELD(search_col_list);
+ COMPARE_SCALAR_FIELD(search_breadth_first);
+ COMPARE_STRING_FIELD(search_seq_column);
+ COMPARE_LOCATION_FIELD(location);
+
+ return true;
+}
+
+static bool
+_equalCTECycleClause(const CTECycleClause *a, const CTECycleClause *b)
+{
+ COMPARE_NODE_FIELD(cycle_col_list);
+ COMPARE_STRING_FIELD(cycle_mark_column);
+ COMPARE_NODE_FIELD(cycle_mark_value);
+ COMPARE_NODE_FIELD(cycle_mark_default);
+ COMPARE_STRING_FIELD(cycle_path_column);
+ COMPARE_LOCATION_FIELD(location);
+ COMPARE_SCALAR_FIELD(cycle_mark_type);
+ COMPARE_SCALAR_FIELD(cycle_mark_typmod);
+ COMPARE_SCALAR_FIELD(cycle_mark_collation);
+ COMPARE_SCALAR_FIELD(cycle_mark_neop);
+
+ return true;
+}
+
+static bool
_equalCommonTableExpr(const CommonTableExpr *a, const CommonTableExpr *b)
{
COMPARE_STRING_FIELD(ctename);
COMPARE_NODE_FIELD(aliascolnames);
COMPARE_SCALAR_FIELD(ctematerialized);
COMPARE_NODE_FIELD(ctequery);
+ COMPARE_NODE_FIELD(search_clause);
+ COMPARE_NODE_FIELD(cycle_clause);
COMPARE_LOCATION_FIELD(location);
COMPARE_SCALAR_FIELD(cterecursive);
COMPARE_SCALAR_FIELD(cterefcount);
@@ -3735,6 +3765,12 @@ equal(const void *a, const void *b)
case T_OnConflictClause:
retval = _equalOnConflictClause(a, b);
break;
+ case T_CTESearchClause:
+ retval = _equalCTESearchClause(a, b);
+ break;
+ case T_CTECycleClause:
+ retval = _equalCTECycleClause(a, b);
+ break;
case T_CommonTableExpr:
retval = _equalCommonTableExpr(a, b);
break;
diff --git a/src/backend/nodes/nodeFuncs.c b/src/backend/nodes/nodeFuncs.c
index 6be19916fce..49357ac5c2d 100644
--- a/src/backend/nodes/nodeFuncs.c
+++ b/src/backend/nodes/nodeFuncs.c
@@ -1566,6 +1566,12 @@ exprLocation(const Node *expr)
case T_OnConflictClause:
loc = ((const OnConflictClause *) expr)->location;
break;
+ case T_CTESearchClause:
+ loc = ((const CTESearchClause *) expr)->location;
+ break;
+ case T_CTECycleClause:
+ loc = ((const CTECycleClause *) expr)->location;
+ break;
case T_CommonTableExpr:
loc = ((const CommonTableExpr *) expr)->location;
break;
@@ -1909,6 +1915,7 @@ expression_tree_walker(Node *node,
case T_NextValueExpr:
case T_RangeTblRef:
case T_SortGroupClause:
+ case T_CTESearchClause:
/* primitive node types with no expression subnodes */
break;
case T_WithCheckOption:
@@ -2148,6 +2155,16 @@ expression_tree_walker(Node *node,
return true;
}
break;
+ case T_CTECycleClause:
+ {
+ CTECycleClause *cc = (CTECycleClause *) node;
+
+ if (walker(cc->cycle_mark_value, context))
+ return true;
+ if (walker(cc->cycle_mark_default, context))
+ return true;
+ }
+ break;
case T_CommonTableExpr:
{
CommonTableExpr *cte = (CommonTableExpr *) node;
@@ -2156,7 +2173,13 @@ expression_tree_walker(Node *node,
* Invoke the walker on the CTE's Query node, so it can
* recurse into the sub-query if it wants to.
*/
- return walker(cte->ctequery, context);
+ if (walker(cte->ctequery, context))
+ return true;
+
+ if (walker(cte->search_clause, context))
+ return true;
+ if (walker(cte->cycle_clause, context))
+ return true;
}
break;
case T_List:
@@ -2615,6 +2638,7 @@ expression_tree_mutator(Node *node,
case T_NextValueExpr:
case T_RangeTblRef:
case T_SortGroupClause:
+ case T_CTESearchClause:
return (Node *) copyObject(node);
case T_WithCheckOption:
{
@@ -3019,6 +3043,17 @@ expression_tree_mutator(Node *node,
return (Node *) newnode;
}
break;
+ case T_CTECycleClause:
+ {
+ CTECycleClause *cc = (CTECycleClause *) node;
+ CTECycleClause *newnode;
+
+ FLATCOPY(newnode, cc, CTECycleClause);
+ MUTATE(newnode->cycle_mark_value, cc->cycle_mark_value, Node *);
+ MUTATE(newnode->cycle_mark_default, cc->cycle_mark_default, Node *);
+ return (Node *) newnode;
+ }
+ break;
case T_CommonTableExpr:
{
CommonTableExpr *cte = (CommonTableExpr *) node;
@@ -3031,6 +3066,10 @@ expression_tree_mutator(Node *node,
* recurse into the sub-query if it wants to.
*/
MUTATE(newnode->ctequery, cte->ctequery, Node *);
+
+ MUTATE(newnode->search_clause, cte->search_clause, CTESearchClause *);
+ MUTATE(newnode->cycle_clause, cte->cycle_clause, CTECycleClause *);
+
return (Node *) newnode;
}
break;
@@ -3913,6 +3952,7 @@ raw_expression_tree_walker(Node *node,
}
break;
case T_CommonTableExpr:
+ /* search_clause and cycle_clause are not interesting here */
return walker(((CommonTableExpr *) node)->ctequery, context);
default:
elog(ERROR, "unrecognized node type: %d",
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index 8392be6d44a..fda732b4c2d 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -3078,6 +3078,34 @@ _outWithClause(StringInfo str, const WithClause *node)
}
static void
+_outCTESearchClause(StringInfo str, const CTESearchClause *node)
+{
+ WRITE_NODE_TYPE("CTESEARCHCLAUSE");
+
+ WRITE_NODE_FIELD(search_col_list);
+ WRITE_BOOL_FIELD(search_breadth_first);
+ WRITE_STRING_FIELD(search_seq_column);
+ WRITE_LOCATION_FIELD(location);
+}
+
+static void
+_outCTECycleClause(StringInfo str, const CTECycleClause *node)
+{
+ WRITE_NODE_TYPE("CTECYCLECLAUSE");
+
+ WRITE_NODE_FIELD(cycle_col_list);
+ WRITE_STRING_FIELD(cycle_mark_column);
+ WRITE_NODE_FIELD(cycle_mark_value);
+ WRITE_NODE_FIELD(cycle_mark_default);
+ WRITE_STRING_FIELD(cycle_path_column);
+ WRITE_LOCATION_FIELD(location);
+ WRITE_OID_FIELD(cycle_mark_type);
+ WRITE_INT_FIELD(cycle_mark_typmod);
+ WRITE_OID_FIELD(cycle_mark_collation);
+ WRITE_OID_FIELD(cycle_mark_neop);
+}
+
+static void
_outCommonTableExpr(StringInfo str, const CommonTableExpr *node)
{
WRITE_NODE_TYPE("COMMONTABLEEXPR");
@@ -3086,6 +3114,8 @@ _outCommonTableExpr(StringInfo str, const CommonTableExpr *node)
WRITE_NODE_FIELD(aliascolnames);
WRITE_ENUM_FIELD(ctematerialized, CTEMaterialize);
WRITE_NODE_FIELD(ctequery);
+ WRITE_NODE_FIELD(search_clause);
+ WRITE_NODE_FIELD(cycle_clause);
WRITE_LOCATION_FIELD(location);
WRITE_BOOL_FIELD(cterecursive);
WRITE_INT_FIELD(cterefcount);
@@ -4262,6 +4292,12 @@ outNode(StringInfo str, const void *obj)
case T_WithClause:
_outWithClause(str, obj);
break;
+ case T_CTESearchClause:
+ _outCTESearchClause(str, obj);
+ break;
+ case T_CTECycleClause:
+ _outCTECycleClause(str, obj);
+ break;
case T_CommonTableExpr:
_outCommonTableExpr(str, obj);
break;
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index d2c8d58070b..4388aae71d2 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -410,6 +410,44 @@ _readRowMarkClause(void)
}
/*
+ * _readCTESearchClause
+ */
+static CTESearchClause *
+_readCTESearchClause(void)
+{
+ READ_LOCALS(CTESearchClause);
+
+ READ_NODE_FIELD(search_col_list);
+ READ_BOOL_FIELD(search_breadth_first);
+ READ_STRING_FIELD(search_seq_column);
+ READ_LOCATION_FIELD(location);
+
+ READ_DONE();
+}
+
+/*
+ * _readCTECycleClause
+ */
+static CTECycleClause *
+_readCTECycleClause(void)
+{
+ READ_LOCALS(CTECycleClause);
+
+ READ_NODE_FIELD(cycle_col_list);
+ READ_STRING_FIELD(cycle_mark_column);
+ READ_NODE_FIELD(cycle_mark_value);
+ READ_NODE_FIELD(cycle_mark_default);
+ READ_STRING_FIELD(cycle_path_column);
+ READ_LOCATION_FIELD(location);
+ READ_OID_FIELD(cycle_mark_type);
+ READ_INT_FIELD(cycle_mark_typmod);
+ READ_OID_FIELD(cycle_mark_collation);
+ READ_OID_FIELD(cycle_mark_neop);
+
+ READ_DONE();
+}
+
+/*
* _readCommonTableExpr
*/
static CommonTableExpr *
@@ -421,6 +459,8 @@ _readCommonTableExpr(void)
READ_NODE_FIELD(aliascolnames);
READ_ENUM_FIELD(ctematerialized, CTEMaterialize);
READ_NODE_FIELD(ctequery);
+ READ_NODE_FIELD(search_clause);
+ READ_NODE_FIELD(cycle_clause);
READ_LOCATION_FIELD(location);
READ_BOOL_FIELD(cterecursive);
READ_INT_FIELD(cterefcount);
@@ -2653,6 +2693,10 @@ parseNodeString(void)
return_value = _readWindowClause();
else if (MATCH("ROWMARKCLAUSE", 13))
return_value = _readRowMarkClause();
+ else if (MATCH("CTESEARCHCLAUSE", 15))
+ return_value = _readCTESearchClause();
+ else if (MATCH("CTECYCLECLAUSE", 14))
+ return_value = _readCTECycleClause();
else if (MATCH("COMMONTABLEEXPR", 15))
return_value = _readCommonTableExpr();
else if (MATCH("SETOPERATIONSTMT", 16))
diff --git a/src/backend/parser/analyze.c b/src/backend/parser/analyze.c
index 65483892252..0f3a70c49a8 100644
--- a/src/backend/parser/analyze.c
+++ b/src/backend/parser/analyze.c
@@ -1810,6 +1810,33 @@ transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt)
}
/*
+ * Make a SortGroupClause node for a SetOperationStmt's groupClauses
+ */
+SortGroupClause *
+makeSortGroupClauseForSetOp(Oid rescoltype)
+{
+ SortGroupClause *grpcl = makeNode(SortGroupClause);
+ Oid sortop;
+ Oid eqop;
+ bool hashable;
+
+ /* determine the eqop and optional sortop */
+ get_sort_group_operators(rescoltype,
+ false, true, false,
+ &sortop, &eqop, NULL,
+ &hashable);
+
+ /* we don't have a tlist yet, so can't assign sortgrouprefs */
+ grpcl->tleSortGroupRef = 0;
+ grpcl->eqop = eqop;
+ grpcl->sortop = sortop;
+ grpcl->nulls_first = false; /* OK with or without sortop */
+ grpcl->hashable = hashable;
+
+ return grpcl;
+}
+
+/*
* transformSetOperationTree
* Recursively transform leaves and internal nodes of a set-op tree
*
@@ -2109,31 +2136,15 @@ transformSetOperationTree(ParseState *pstate, SelectStmt *stmt,
*/
if (op->op != SETOP_UNION || !op->all)
{
- SortGroupClause *grpcl = makeNode(SortGroupClause);
- Oid sortop;
- Oid eqop;
- bool hashable;
ParseCallbackState pcbstate;
setup_parser_errposition_callback(&pcbstate, pstate,
bestlocation);
- /* determine the eqop and optional sortop */
- get_sort_group_operators(rescoltype,
- false, true, false,
- &sortop, &eqop, NULL,
- &hashable);
+ op->groupClauses = lappend(op->groupClauses,
+ makeSortGroupClauseForSetOp(rescoltype));
cancel_parser_errposition_callback(&pcbstate);
-
- /* we don't have a tlist yet, so can't assign sortgrouprefs */
- grpcl->tleSortGroupRef = 0;
- grpcl->eqop = eqop;
- grpcl->sortop = sortop;
- grpcl->nulls_first = false; /* OK with or without sortop */
- grpcl->hashable = hashable;
-
- op->groupClauses = lappend(op->groupClauses, grpcl);
}
/*
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index b2f447bf9a2..dd72a9fc3c4 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -494,6 +494,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
%type <list> row explicit_row implicit_row type_list array_expr_list
%type <node> case_expr case_arg when_clause case_default
%type <list> when_clause_list
+%type <node> opt_search_clause opt_cycle_clause
%type <ival> sub_type opt_materialized
%type <value> NumericOnly
%type <list> NumericOnly_list
@@ -625,7 +626,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
ASSERTION ASSIGNMENT ASYMMETRIC AT ATTACH ATTRIBUTE AUTHORIZATION
BACKWARD BEFORE BEGIN_P BETWEEN BIGINT BINARY BIT
- BOOLEAN_P BOTH BY
+ BOOLEAN_P BOTH BREADTH BY
CACHE CALL CALLED CASCADE CASCADED CASE CAST CATALOG_P CHAIN CHAR_P
CHARACTER CHARACTERISTICS CHECK CHECKPOINT CLASS CLOSE
@@ -637,7 +638,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
CURRENT_TIME CURRENT_TIMESTAMP CURRENT_USER CURSOR CYCLE
DATA_P DATABASE DAY_P DEALLOCATE DEC DECIMAL_P DECLARE DEFAULT DEFAULTS
- DEFERRABLE DEFERRED DEFINER DELETE_P DELIMITER DELIMITERS DEPENDS DESC
+ DEFERRABLE DEFERRED DEFINER DELETE_P DELIMITER DELIMITERS DEPENDS DEPTH DESC
DETACH DICTIONARY DISABLE_P DISCARD DISTINCT DO DOCUMENT_P DOMAIN_P
DOUBLE_P DROP
@@ -11353,8 +11354,6 @@ simple_select:
* WITH [ RECURSIVE ] <query name> [ (<column>,...) ]
* AS (query) [ SEARCH or CYCLE clause ]
*
- * We don't currently support the SEARCH or CYCLE clause.
- *
* Recognizing WITH_LA here allows a CTE to be named TIME or ORDINALITY.
*/
with_clause:
@@ -11386,13 +11385,15 @@ cte_list:
| cte_list ',' common_table_expr { $$ = lappend($1, $3); }
;
-common_table_expr: name opt_name_list AS opt_materialized '(' PreparableStmt ')'
+common_table_expr: name opt_name_list AS opt_materialized '(' PreparableStmt ')' opt_search_clause opt_cycle_clause
{
CommonTableExpr *n = makeNode(CommonTableExpr);
n->ctename = $1;
n->aliascolnames = $2;
n->ctematerialized = $4;
n->ctequery = $6;
+ n->search_clause = castNode(CTESearchClause, $8);
+ n->cycle_clause = castNode(CTECycleClause, $9);
n->location = @1;
$$ = (Node *) n;
}
@@ -11404,6 +11405,49 @@ opt_materialized:
| /*EMPTY*/ { $$ = CTEMaterializeDefault; }
;
+opt_search_clause:
+ SEARCH DEPTH FIRST_P BY columnList SET ColId
+ {
+ CTESearchClause *n = makeNode(CTESearchClause);
+ n->search_col_list = $5;
+ n->search_breadth_first = false;
+ n->search_seq_column = $7;
+ n->location = @1;
+ $$ = (Node *) n;
+ }
+ | SEARCH BREADTH FIRST_P BY columnList SET ColId
+ {
+ CTESearchClause *n = makeNode(CTESearchClause);
+ n->search_col_list = $5;
+ n->search_breadth_first = true;
+ n->search_seq_column = $7;
+ n->location = @1;
+ $$ = (Node *) n;
+ }
+ | /*EMPTY*/
+ {
+ $$ = NULL;
+ }
+ ;
+
+opt_cycle_clause:
+ CYCLE columnList SET ColId TO AexprConst DEFAULT AexprConst USING ColId
+ {
+ CTECycleClause *n = makeNode(CTECycleClause);
+ n->cycle_col_list = $2;
+ n->cycle_mark_column = $4;
+ n->cycle_mark_value = $6;
+ n->cycle_mark_default = $8;
+ n->cycle_path_column = $10;
+ n->location = @1;
+ $$ = (Node *) n;
+ }
+ | /*EMPTY*/
+ {
+ $$ = NULL;
+ }
+ ;
+
opt_with_clause:
with_clause { $$ = $1; }
| /*EMPTY*/ { $$ = NULL; }
@@ -15222,6 +15266,7 @@ unreserved_keyword:
| BACKWARD
| BEFORE
| BEGIN_P
+ | BREADTH
| BY
| CACHE
| CALL
@@ -15266,6 +15311,7 @@ unreserved_keyword:
| DELIMITER
| DELIMITERS
| DEPENDS
+ | DEPTH
| DETACH
| DICTIONARY
| DISABLE_P
@@ -15733,6 +15779,7 @@ bare_label_keyword:
| BIT
| BOOLEAN_P
| BOTH
+ | BREADTH
| BY
| CACHE
| CALL
@@ -15797,6 +15844,7 @@ bare_label_keyword:
| DELIMITER
| DELIMITERS
| DEPENDS
+ | DEPTH
| DESC
| DETACH
| DICTIONARY
diff --git a/src/backend/parser/parse_agg.c b/src/backend/parser/parse_agg.c
index 588f005dd93..fd08b9eeff0 100644
--- a/src/backend/parser/parse_agg.c
+++ b/src/backend/parser/parse_agg.c
@@ -545,6 +545,10 @@ check_agglevels_and_constraints(ParseState *pstate, Node *expr)
break;
+ case EXPR_KIND_CYCLE_MARK:
+ errkind = true;
+ break;
+
/*
* There is intentionally no default: case here, so that the
* compiler will warn if we add a new ParseExprKind without
@@ -933,6 +937,9 @@ transformWindowFuncCall(ParseState *pstate, WindowFunc *wfunc,
case EXPR_KIND_GENERATED_COLUMN:
err = _("window functions are not allowed in column generation expressions");
break;
+ case EXPR_KIND_CYCLE_MARK:
+ errkind = true;
+ break;
/*
* There is intentionally no default: case here, so that the
diff --git a/src/backend/parser/parse_cte.c b/src/backend/parser/parse_cte.c
index 4e0029c58c9..f4f7041ead0 100644
--- a/src/backend/parser/parse_cte.c
+++ b/src/backend/parser/parse_cte.c
@@ -18,9 +18,13 @@
#include "catalog/pg_type.h"
#include "nodes/nodeFuncs.h"
#include "parser/analyze.h"
+#include "parser/parse_coerce.h"
+#include "parser/parse_collate.h"
#include "parser/parse_cte.h"
+#include "parser/parse_expr.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
+#include "utils/typcache.h"
/* Enumeration of contexts in which a self-reference is disallowed */
@@ -334,6 +338,195 @@ analyzeCTE(ParseState *pstate, CommonTableExpr *cte)
if (lctyp != NULL || lctypmod != NULL || lccoll != NULL) /* shouldn't happen */
elog(ERROR, "wrong number of output columns in WITH");
}
+
+ if (cte->search_clause || cte->cycle_clause)
+ {
+ Query *ctequery;
+ SetOperationStmt *sos;
+
+ if (!cte->cterecursive)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("WITH query is not recursive"),
+ parser_errposition(pstate, cte->location)));
+
+ /*
+ * SQL requires a WITH list element (CTE) to be "expandable" in order
+ * to allow a search or cycle clause. That is a stronger requirement
+ * than just being recursive. It basically means the query expression
+ * looks like
+ *
+ * non-recursive query UNION [ALL] recursive query
+ *
+ * and that the recursive query is not itself a set operation.
+ *
+ * As of this writing, most of these criteria are already satisfied by
+ * all recursive CTEs allowed by PostgreSQL. In the future, if
+ * further variants recursive CTEs are accepted, there might be
+ * further checks required here to determine what is "expandable".
+ */
+
+ ctequery = castNode(Query, cte->ctequery);
+ Assert(ctequery->setOperations);
+ sos = castNode(SetOperationStmt, ctequery->setOperations);
+
+ /*
+ * This left side check is not required for expandability, but
+ * rewriteSearchAndCycle() doesn't currently have support for it, so
+ * we catch it here.
+ */
+ if (!IsA(sos->larg, RangeTblRef))
+ ereport(ERROR,
+ (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+ errmsg("with a SEARCH or CYCLE clause, the left side of the UNION must be a SELECT")));
+
+ if (!IsA(sos->rarg, RangeTblRef))
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("with a SEARCH or CYCLE clause, the right side of the UNION must be a SELECT")));
+ }
+
+ if (cte->search_clause)
+ {
+ ListCell *lc;
+ List *seen = NIL;
+
+ foreach(lc, cte->search_clause->search_col_list)
+ {
+ Value *colname = lfirst(lc);
+
+ if (!list_member(cte->ctecolnames, colname))
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("search column \"%s\" not in WITH query column list",
+ strVal(colname)),
+ parser_errposition(pstate, cte->search_clause->location)));
+
+ if (list_member(seen, colname))
+ ereport(ERROR,
+ (errcode(ERRCODE_DUPLICATE_COLUMN),
+ errmsg("search column \"%s\" specified more than once",
+ strVal(colname)),
+ parser_errposition(pstate, cte->search_clause->location)));
+ seen = lappend(seen, colname);
+ }
+
+ if (list_member(cte->ctecolnames, makeString(cte->search_clause->search_seq_column)))
+ ereport(ERROR,
+ errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("search sequence column name \"%s\" already used in WITH query column list",
+ cte->search_clause->search_seq_column),
+ parser_errposition(pstate, cte->search_clause->location));
+ }
+
+ if (cte->cycle_clause)
+ {
+ ListCell *lc;
+ List *seen = NIL;
+ TypeCacheEntry *typentry;
+ Oid op;
+
+ foreach(lc, cte->cycle_clause->cycle_col_list)
+ {
+ Value *colname = lfirst(lc);
+
+ if (!list_member(cte->ctecolnames, colname))
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("cycle column \"%s\" not in WITH query column list",
+ strVal(colname)),
+ parser_errposition(pstate, cte->cycle_clause->location)));
+
+ if (list_member(seen, colname))
+ ereport(ERROR,
+ (errcode(ERRCODE_DUPLICATE_COLUMN),
+ errmsg("cycle column \"%s\" specified more than once",
+ strVal(colname)),
+ parser_errposition(pstate, cte->cycle_clause->location)));
+ seen = lappend(seen, colname);
+ }
+
+ if (list_member(cte->ctecolnames, makeString(cte->cycle_clause->cycle_mark_column)))
+ ereport(ERROR,
+ errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("cycle mark column name \"%s\" already used in WITH query column list",
+ cte->cycle_clause->cycle_mark_column),
+ parser_errposition(pstate, cte->cycle_clause->location));
+
+ cte->cycle_clause->cycle_mark_value = transformExpr(pstate, cte->cycle_clause->cycle_mark_value,
+ EXPR_KIND_CYCLE_MARK);
+ cte->cycle_clause->cycle_mark_default = transformExpr(pstate, cte->cycle_clause->cycle_mark_default,
+ EXPR_KIND_CYCLE_MARK);
+
+ if (list_member(cte->ctecolnames, makeString(cte->cycle_clause->cycle_path_column)))
+ ereport(ERROR,
+ errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("cycle path column name \"%s\" already used in WITH query column list",
+ cte->cycle_clause->cycle_path_column),
+ parser_errposition(pstate, cte->cycle_clause->location));
+
+ if (strcmp(cte->cycle_clause->cycle_mark_column,
+ cte->cycle_clause->cycle_path_column) == 0)
+ ereport(ERROR,
+ errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("cycle mark column name and cycle path column name are the same"),
+ parser_errposition(pstate, cte->cycle_clause->location));
+
+ cte->cycle_clause->cycle_mark_type = select_common_type(pstate,
+ list_make2(cte->cycle_clause->cycle_mark_value,
+ cte->cycle_clause->cycle_mark_default),
+ "CYCLE", NULL);
+ cte->cycle_clause->cycle_mark_value = coerce_to_common_type(pstate,
+ cte->cycle_clause->cycle_mark_value,
+ cte->cycle_clause->cycle_mark_type,
+ "CYCLE/SET/TO");
+ cte->cycle_clause->cycle_mark_default = coerce_to_common_type(pstate,
+ cte->cycle_clause->cycle_mark_default,
+ cte->cycle_clause->cycle_mark_type,
+ "CYCLE/SET/DEFAULT");
+
+ cte->cycle_clause->cycle_mark_typmod = select_common_typmod(pstate,
+ list_make2(cte->cycle_clause->cycle_mark_value,
+ cte->cycle_clause->cycle_mark_default),
+ cte->cycle_clause->cycle_mark_type);
+
+ cte->cycle_clause->cycle_mark_collation = select_common_collation(pstate,
+ list_make2(cte->cycle_clause->cycle_mark_value,
+ cte->cycle_clause->cycle_mark_default),
+ true);
+
+ typentry = lookup_type_cache(cte->cycle_clause->cycle_mark_type, TYPECACHE_EQ_OPR);
+ if (!typentry->eq_opr)
+ ereport(ERROR,
+ errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("could not identify an equality operator for type %s",
+ format_type_be(cte->cycle_clause->cycle_mark_type)));
+ op = get_negator(typentry->eq_opr);
+ if (!op)
+ ereport(ERROR,
+ errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("could not identify an inequality operator for type %s",
+ format_type_be(cte->cycle_clause->cycle_mark_type)));
+
+ cte->cycle_clause->cycle_mark_neop = op;
+ }
+
+ if (cte->search_clause && cte->cycle_clause)
+ {
+ if (strcmp(cte->search_clause->search_seq_column,
+ cte->cycle_clause->cycle_mark_column) == 0)
+ ereport(ERROR,
+ errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("search sequence column name and cycle mark column name are the same"),
+ parser_errposition(pstate, cte->search_clause->location));
+
+ if (strcmp(cte->search_clause->search_seq_column,
+ cte->cycle_clause->cycle_path_column) == 0)
+ ereport(ERROR,
+ errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("search_sequence column name and cycle path column name are the same"),
+ parser_errposition(pstate, cte->search_clause->location));
+ }
}
/*
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index 379355f9bff..6c87783b2c7 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -507,6 +507,7 @@ transformColumnRef(ParseState *pstate, ColumnRef *cref)
case EXPR_KIND_CALL_ARGUMENT:
case EXPR_KIND_COPY_WHERE:
case EXPR_KIND_GENERATED_COLUMN:
+ case EXPR_KIND_CYCLE_MARK:
/* okay */
break;
@@ -1723,6 +1724,7 @@ transformSubLink(ParseState *pstate, SubLink *sublink)
case EXPR_KIND_RETURNING:
case EXPR_KIND_VALUES:
case EXPR_KIND_VALUES_SINGLE:
+ case EXPR_KIND_CYCLE_MARK:
/* okay */
break;
case EXPR_KIND_CHECK_CONSTRAINT:
@@ -3044,6 +3046,8 @@ ParseExprKindName(ParseExprKind exprKind)
return "WHERE";
case EXPR_KIND_GENERATED_COLUMN:
return "GENERATED AS";
+ case EXPR_KIND_CYCLE_MARK:
+ return "CYCLE";
/*
* There is intentionally no default: case here, so that the
diff --git a/src/backend/parser/parse_func.c b/src/backend/parser/parse_func.c
index 07d0013e84b..37cebc7d829 100644
--- a/src/backend/parser/parse_func.c
+++ b/src/backend/parser/parse_func.c
@@ -2527,6 +2527,9 @@ check_srf_call_placement(ParseState *pstate, Node *last_srf, int location)
case EXPR_KIND_GENERATED_COLUMN:
err = _("set-returning functions are not allowed in column generation expressions");
break;
+ case EXPR_KIND_CYCLE_MARK:
+ errkind = true;
+ break;
/*
* There is intentionally no default: case here, so that the
diff --git a/src/backend/parser/parse_relation.c b/src/backend/parser/parse_relation.c
index e490043cf55..43db4e9af8b 100644
--- a/src/backend/parser/parse_relation.c
+++ b/src/backend/parser/parse_relation.c
@@ -2235,6 +2235,8 @@ addRangeTableEntryForCTE(ParseState *pstate,
int numaliases;
int varattno;
ListCell *lc;
+ int n_dontexpand_columns = 0;
+ ParseNamespaceItem *psi;
Assert(pstate != NULL);
@@ -2267,9 +2269,9 @@ addRangeTableEntryForCTE(ParseState *pstate,
parser_errposition(pstate, rv->location)));
}
- rte->coltypes = cte->ctecoltypes;
- rte->coltypmods = cte->ctecoltypmods;
- rte->colcollations = cte->ctecolcollations;
+ rte->coltypes = list_copy(cte->ctecoltypes);
+ rte->coltypmods = list_copy(cte->ctecoltypmods);
+ rte->colcollations = list_copy(cte->ctecolcollations);
rte->alias = alias;
if (alias)
@@ -2294,6 +2296,34 @@ addRangeTableEntryForCTE(ParseState *pstate,
rte->eref = eref;
+ if (cte->search_clause)
+ {
+ rte->eref->colnames = lappend(rte->eref->colnames, makeString(cte->search_clause->search_seq_column));
+ if (cte->search_clause->search_breadth_first)
+ rte->coltypes = lappend_oid(rte->coltypes, RECORDOID);
+ else
+ rte->coltypes = lappend_oid(rte->coltypes, RECORDARRAYOID);
+ rte->coltypmods = lappend_int(rte->coltypmods, -1);
+ rte->colcollations = lappend_oid(rte->colcollations, InvalidOid);
+
+ n_dontexpand_columns += 1;
+ }
+
+ if (cte->cycle_clause)
+ {
+ rte->eref->colnames = lappend(rte->eref->colnames, makeString(cte->cycle_clause->cycle_mark_column));
+ rte->coltypes = lappend_oid(rte->coltypes, cte->cycle_clause->cycle_mark_type);
+ rte->coltypmods = lappend_int(rte->coltypmods, cte->cycle_clause->cycle_mark_typmod);
+ rte->colcollations = lappend_oid(rte->colcollations, cte->cycle_clause->cycle_mark_collation);
+
+ rte->eref->colnames = lappend(rte->eref->colnames, makeString(cte->cycle_clause->cycle_path_column));
+ rte->coltypes = lappend_oid(rte->coltypes, RECORDARRAYOID);
+ rte->coltypmods = lappend_int(rte->coltypmods, -1);
+ rte->colcollations = lappend_oid(rte->colcollations, InvalidOid);
+
+ n_dontexpand_columns += 2;
+ }
+
/*
* Set flags and access permissions.
*
@@ -2321,9 +2351,19 @@ addRangeTableEntryForCTE(ParseState *pstate,
* Build a ParseNamespaceItem, but don't add it to the pstate's namespace
* list --- caller must do that if appropriate.
*/
- return buildNSItemFromLists(rte, list_length(pstate->p_rtable),
+ psi = buildNSItemFromLists(rte, list_length(pstate->p_rtable),
rte->coltypes, rte->coltypmods,
rte->colcollations);
+
+ /*
+ * The columns added by search and cycle clauses are not included in star
+ * expansion in queries contained in the CTE.
+ */
+ if (rte->ctelevelsup > 0)
+ for (int i = 0; i < n_dontexpand_columns; i++)
+ psi->p_nscolumns[list_length(psi->p_rte->eref->colnames) - 1 - i].p_dontexpand = true;
+
+ return psi;
}
/*
@@ -3008,7 +3048,11 @@ expandNSItemVars(ParseNamespaceItem *nsitem,
const char *colname = strVal(colnameval);
ParseNamespaceColumn *nscol = nsitem->p_nscolumns + colindex;
- if (colname[0])
+ if (nscol->p_dontexpand)
+ {
+ /* skip */
+ }
+ else if (colname[0])
{
Var *var;
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 7eaa076771a..51ecc16c42e 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -399,8 +399,23 @@ markTargetListOrigin(ParseState *pstate, TargetEntry *tle,
{
CommonTableExpr *cte = GetCTEForRTE(pstate, rte, netlevelsup);
TargetEntry *ste;
+ List *tl = GetCTETargetList(cte);
+ int extra_cols = 0;
+
+ /*
+ * RTE for CTE will already have the search and cycle columns
+ * added, but the subquery won't, so skip looking those up.
+ */
+ if (cte->search_clause)
+ extra_cols += 1;
+ if (cte->cycle_clause)
+ extra_cols += 2;
+ if (extra_cols &&
+ attnum > list_length(tl) &&
+ attnum <= list_length(tl) + extra_cols)
+ break;
- ste = get_tle_by_resno(GetCTETargetList(cte), attnum);
+ ste = get_tle_by_resno(tl, attnum);
if (ste == NULL || ste->resjunk)
elog(ERROR, "CTE %s does not have attribute %d",
rte->eref->aliasname, attnum);
diff --git a/src/backend/rewrite/Makefile b/src/backend/rewrite/Makefile
index b435b3e985c..4680752e6a7 100644
--- a/src/backend/rewrite/Makefile
+++ b/src/backend/rewrite/Makefile
@@ -17,6 +17,7 @@ OBJS = \
rewriteHandler.o \
rewriteManip.o \
rewriteRemove.o \
+ rewriteSearchCycle.o \
rewriteSupport.o \
rowsecurity.o
diff --git a/src/backend/rewrite/rewriteHandler.c b/src/backend/rewrite/rewriteHandler.c
index 0c7508a0d8b..0672f497c6b 100644
--- a/src/backend/rewrite/rewriteHandler.c
+++ b/src/backend/rewrite/rewriteHandler.c
@@ -38,6 +38,7 @@
#include "rewrite/rewriteDefine.h"
#include "rewrite/rewriteHandler.h"
#include "rewrite/rewriteManip.h"
+#include "rewrite/rewriteSearchCycle.h"
#include "rewrite/rowsecurity.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
@@ -2080,6 +2081,23 @@ fireRIRrules(Query *parsetree, List *activeRIRs)
ListCell *lc;
/*
+ * Expand SEARCH and CYCLE clauses in CTEs.
+ *
+ * This is just a convenient place to do this, since we are already
+ * looking at each Query.
+ */
+ foreach(lc, parsetree->cteList)
+ {
+ CommonTableExpr *cte = lfirst_node(CommonTableExpr, lc);
+
+ if (cte->search_clause || cte->cycle_clause)
+ {
+ cte = rewriteSearchAndCycle(cte);
+ lfirst(lc) = cte;
+ }
+ }
+
+ /*
* don't try to convert this into a foreach loop, because rtable list can
* get changed each time through...
*/
diff --git a/src/backend/rewrite/rewriteSearchCycle.c b/src/backend/rewrite/rewriteSearchCycle.c
new file mode 100644
index 00000000000..1a7d66fa6f9
--- /dev/null
+++ b/src/backend/rewrite/rewriteSearchCycle.c
@@ -0,0 +1,668 @@
+/*-------------------------------------------------------------------------
+ *
+ * rewriteSearchCycle.c
+ * Support for rewriting SEARCH and CYCLE clauses.
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ * src/backend/rewrite/rewriteSearchCycle.c
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "catalog/pg_operator_d.h"
+#include "catalog/pg_type_d.h"
+#include "nodes/makefuncs.h"
+#include "nodes/pg_list.h"
+#include "nodes/parsenodes.h"
+#include "nodes/primnodes.h"
+#include "parser/analyze.h"
+#include "parser/parsetree.h"
+#include "rewrite/rewriteManip.h"
+#include "rewrite/rewriteSearchCycle.h"
+#include "utils/fmgroids.h"
+
+
+/*----------
+ * Rewrite a CTE with SEARCH or CYCLE clause
+ *
+ * Consider a CTE like
+ *
+ * WITH RECURSIVE ctename (col1, col2, col3) AS (
+ * query1
+ * UNION [ALL]
+ * SELECT trosl FROM ctename
+ * )
+ *
+ * With a search clause
+ *
+ * SEARCH BREADTH FIRST BY col1, col2 SET sqc
+ *
+ * the CTE is rewritten to
+ *
+ * WITH RECURSIVE ctename (col1, col2, col3, sqc) AS (
+ * SELECT col1, col2, col3, -- original WITH column list
+ * ROW(0, col1, col2) -- initial row of search columns
+ * FROM (query1) "*TLOCRN*" (col1, col2, col3)
+ * UNION [ALL]
+ * SELECT col1, col2, col3, -- same as above
+ * ROW(sqc.depth + 1, col1, col2) -- count depth
+ * FROM (SELECT trosl, ctename.sqc FROM ctename) "*TROCRN*" (col1, col2, col3, sqc)
+ * )
+ *
+ * (This isn't quite legal SQL: sqc.depth is meant to refer to the first
+ * column of sqc, which has a row type, but the field names are not defined
+ * here. Representing this properly in SQL would be more complicated (and the
+ * SQL standard actually does it in that more complicated way), but the
+ * internal representation allows us to construct it this way.)
+ *
+ * With a search caluse
+ *
+ * SEARCH DEPTH FIRST BY col1, col2 SET sqc
+ *
+ * the CTE is rewritten to
+ *
+ * WITH RECURSIVE ctename (col1, col2, col3, sqc) AS (
+ * SELECT col1, col2, col3, -- original WITH column list
+ * ARRAY[ROW(col1, col2)] -- initial row of search columns
+ * FROM (query1) "*TLOCRN*" (col1, col2, col3)
+ * UNION [ALL]
+ * SELECT col1, col2, col3, -- same as above
+ * sqc || ARRAY[ROW(col1, col2)] -- record rows seen
+ * FROM (SELECT trosl, ctename.sqc FROM ctename) "*TROCRN*" (col1, col2, col3, sqc)
+ * )
+ *
+ * With a cycle clause
+ *
+ * CYCLE col1, col2 SET cmc TO 'Y' DEFAULT 'N' USING cpa
+ *
+ * (cmc = cycle mark column, cpa = cycle path) the CTE is rewritten to
+ *
+ * WITH RECURSIVE ctename (col1, col2, col3, cmc, cpa) AS (
+ * SELECT col1, col2, col3, -- original WITH column list
+ * 'N', -- cycle mark default
+ * ARRAY[ROW(col1, col2)] -- initial row of cycle columns
+ * FROM (query1) "*TLOCRN*" (col1, col2, col3)
+ * UNION [ALL]
+ * SELECT col1, col2, col3, -- same as above
+ * CASE WHEN ROW(col1, col2) = ANY (ARRAY[cpa]) THEN 'Y' ELSE 'N' END, -- compute cycle mark column
+ * cpa || ARRAY[ROW(col1, col2)] -- record rows seen
+ * FROM (SELECT trosl, ctename.cmc, ctename.cpa FROM ctename) "*TROCRN*" (col1, col2, col3, cmc, cpa)
+ * WHERE cmc <> 'Y'
+ * )
+ *
+ * The expression to compute the cycle mark column in the right-hand query is
+ * written as
+ *
+ * CASE WHEN ROW(col1, col2) IN (SELECT p.* FROM TABLE(cpa) p) THEN cmv ELSE cmd END
+ *
+ * in the SQL standard, but in PostgreSQL we can use the scalar-array operator
+ * expression shown above.
+ *
+ * Also, in some of the cases where operators are shown above we actually
+ * directly produce the underlying function call.
+ *
+ * If both a search clause and a cycle clause is specified, then the search
+ * clause column is added before the cycle clause columns.
+ */
+
+/*
+ * Make a RowExpr from the specified column names, which have to be among the
+ * output columns of the CTE.
+ */
+static RowExpr *
+make_path_rowexpr(const CommonTableExpr *cte, const List *col_list)
+{
+ RowExpr *rowexpr;
+ ListCell *lc;
+
+ rowexpr = makeNode(RowExpr);
+ rowexpr->row_typeid = RECORDOID;
+ rowexpr->row_format = COERCE_IMPLICIT_CAST;
+ rowexpr->location = -1;
+
+ foreach(lc, col_list)
+ {
+ char *colname = strVal(lfirst(lc));
+
+ for (int i = 0; i < list_length(cte->ctecolnames); i++)
+ {
+ char *colname2 = strVal(list_nth(cte->ctecolnames, i));
+
+ if (strcmp(colname, colname2) == 0)
+ {
+ Var *var;
+
+ var = makeVar(1, i + 1,
+ list_nth_oid(cte->ctecoltypes, i),
+ list_nth_int(cte->ctecoltypmods, i),
+ list_nth_oid(cte->ctecolcollations, i),
+ 0);
+ rowexpr->args = lappend(rowexpr->args, var);
+ rowexpr->colnames = lappend(rowexpr->colnames, makeString(colname));
+ break;
+ }
+ }
+ }
+
+ return rowexpr;
+}
+
+/*
+ * Wrap a RowExpr in an ArrayExpr, for the initial search depth first or cycle
+ * row.
+ */
+static Expr *
+make_path_initial_array(RowExpr *rowexpr)
+{
+ ArrayExpr *arr;
+
+ arr = makeNode(ArrayExpr);
+ arr->array_typeid = RECORDARRAYOID;
+ arr->element_typeid = RECORDOID;
+ arr->location = -1;
+ arr->elements = list_make1(rowexpr);
+
+ return (Expr *) arr;
+}
+
+/*
+ * Make an array catenation expression like
+ *
+ * cpa || ARRAY[ROW(cols)]
+ *
+ * where the varattno of cpa is provided as path_varattno.
+ */
+static Expr *
+make_path_cat_expr(RowExpr *rowexpr, AttrNumber path_varattno)
+{
+ ArrayExpr *arr;
+ FuncExpr *fexpr;
+
+ arr = makeNode(ArrayExpr);
+ arr->array_typeid = RECORDARRAYOID;
+ arr->element_typeid = RECORDOID;
+ arr->location = -1;
+ arr->elements = list_make1(rowexpr);
+
+ fexpr = makeFuncExpr(F_ARRAY_CAT, RECORDARRAYOID,
+ list_make2(makeVar(1, path_varattno, RECORDARRAYOID, -1, 0, 0),
+ arr),
+ InvalidOid, InvalidOid, COERCE_EXPLICIT_CALL);
+
+ return (Expr *) fexpr;
+}
+
+/*
+ * The real work happens here.
+ */
+CommonTableExpr *
+rewriteSearchAndCycle(CommonTableExpr *cte)
+{
+ Query *ctequery;
+ SetOperationStmt *sos;
+ int rti1,
+ rti2;
+ RangeTblEntry *rte1,
+ *rte2,
+ *newrte;
+ Query *newq1,
+ *newq2;
+ Query *newsubquery;
+ RangeTblRef *rtr;
+ Oid search_seq_type = InvalidOid;
+ AttrNumber sqc_attno = InvalidAttrNumber;
+ AttrNumber cmc_attno = InvalidAttrNumber;
+ AttrNumber cpa_attno = InvalidAttrNumber;
+ TargetEntry *tle;
+ RowExpr *cycle_col_rowexpr = NULL;
+ RowExpr *search_col_rowexpr = NULL;
+ List *ewcl;
+ int cte_rtindex = -1;
+
+ Assert(cte->search_clause || cte->cycle_clause);
+
+ cte = copyObject(cte);
+
+ ctequery = castNode(Query, cte->ctequery);
+
+ /*
+ * The top level of the CTE's query should be a UNION. Find the two
+ * subqueries.
+ */
+ Assert(ctequery->setOperations);
+ sos = castNode(SetOperationStmt, ctequery->setOperations);
+ Assert(sos->op == SETOP_UNION);
+
+ rti1 = castNode(RangeTblRef, sos->larg)->rtindex;
+ rti2 = castNode(RangeTblRef, sos->rarg)->rtindex;
+
+ rte1 = rt_fetch(rti1, ctequery->rtable);
+ rte2 = rt_fetch(rti2, ctequery->rtable);
+
+ Assert(rte1->rtekind == RTE_SUBQUERY);
+ Assert(rte2->rtekind == RTE_SUBQUERY);
+
+ /*
+ * We'll need this a few times later.
+ */
+ if (cte->search_clause)
+ {
+ if (cte->search_clause->search_breadth_first)
+ search_seq_type = RECORDOID;
+ else
+ search_seq_type = RECORDARRAYOID;
+ }
+
+ /*
+ * Attribute numbers of the added columns in the CTE's column list
+ */
+ if (cte->search_clause)
+ sqc_attno = list_length(cte->ctecolnames) + 1;
+ if (cte->cycle_clause)
+ {
+ cmc_attno = list_length(cte->ctecolnames) + 1;
+ cpa_attno = list_length(cte->ctecolnames) + 2;
+ if (cte->search_clause)
+ {
+ cmc_attno++;
+ cpa_attno++;
+ }
+ }
+
+ /*
+ * Make new left subquery
+ */
+ newq1 = makeNode(Query);
+ newq1->commandType = CMD_SELECT;
+ newq1->canSetTag = true;
+
+ newrte = makeNode(RangeTblEntry);
+ newrte->rtekind = RTE_SUBQUERY;
+ newrte->alias = makeAlias("*TLOCRN*", cte->ctecolnames);
+ newrte->eref = newrte->alias;
+ newsubquery = copyObject(rte1->subquery);
+ IncrementVarSublevelsUp((Node *) newsubquery, 1, 1);
+ newrte->subquery = newsubquery;
+ newrte->inFromCl = true;
+ newq1->rtable = list_make1(newrte);
+
+ rtr = makeNode(RangeTblRef);
+ rtr->rtindex = 1;
+ newq1->jointree = makeFromExpr(list_make1(rtr), NULL);
+
+ /*
+ * Make target list
+ */
+ for (int i = 0; i < list_length(cte->ctecolnames); i++)
+ {
+ Var *var;
+
+ var = makeVar(1, i + 1,
+ list_nth_oid(cte->ctecoltypes, i),
+ list_nth_int(cte->ctecoltypmods, i),
+ list_nth_oid(cte->ctecolcollations, i),
+ 0);
+ tle = makeTargetEntry((Expr *) var, i + 1, strVal(list_nth(cte->ctecolnames, i)), false);
+ tle->resorigtbl = castNode(TargetEntry, list_nth(rte1->subquery->targetList, i))->resorigtbl;
+ tle->resorigcol = castNode(TargetEntry, list_nth(rte1->subquery->targetList, i))->resorigcol;
+ newq1->targetList = lappend(newq1->targetList, tle);
+ }
+
+ if (cte->search_clause)
+ {
+ Expr *texpr;
+
+ search_col_rowexpr = make_path_rowexpr(cte, cte->search_clause->search_col_list);
+ if (cte->search_clause->search_breadth_first)
+ {
+ search_col_rowexpr->args = lcons(makeConst(INT8OID, -1, InvalidOid, sizeof(int64),
+ Int64GetDatum(0), false, FLOAT8PASSBYVAL),
+ search_col_rowexpr->args);
+ search_col_rowexpr->colnames = lcons(makeString("*DEPTH*"), search_col_rowexpr->colnames);
+ texpr = (Expr *) search_col_rowexpr;
+ }
+ else
+ texpr = make_path_initial_array(search_col_rowexpr);
+ tle = makeTargetEntry(texpr,
+ list_length(newq1->targetList) + 1,
+ cte->search_clause->search_seq_column,
+ false);
+ newq1->targetList = lappend(newq1->targetList, tle);
+ }
+ if (cte->cycle_clause)
+ {
+ tle = makeTargetEntry((Expr *) cte->cycle_clause->cycle_mark_default,
+ list_length(newq1->targetList) + 1,
+ cte->cycle_clause->cycle_mark_column,
+ false);
+ newq1->targetList = lappend(newq1->targetList, tle);
+ cycle_col_rowexpr = make_path_rowexpr(cte, cte->cycle_clause->cycle_col_list);
+ tle = makeTargetEntry(make_path_initial_array(cycle_col_rowexpr),
+ list_length(newq1->targetList) + 1,
+ cte->cycle_clause->cycle_path_column,
+ false);
+ newq1->targetList = lappend(newq1->targetList, tle);
+ }
+
+ rte1->subquery = newq1;
+
+ if (cte->search_clause)
+ {
+ rte1->eref->colnames = lappend(rte1->eref->colnames, makeString(cte->search_clause->search_seq_column));
+ }
+ if (cte->cycle_clause)
+ {
+ rte1->eref->colnames = lappend(rte1->eref->colnames, makeString(cte->cycle_clause->cycle_mark_column));
+ rte1->eref->colnames = lappend(rte1->eref->colnames, makeString(cte->cycle_clause->cycle_path_column));
+ }
+
+ /*
+ * Make new right subquery
+ */
+ newq2 = makeNode(Query);
+ newq2->commandType = CMD_SELECT;
+ newq2->canSetTag = true;
+
+ newrte = makeNode(RangeTblEntry);
+ newrte->rtekind = RTE_SUBQUERY;
+ ewcl = copyObject(cte->ctecolnames);
+ if (cte->search_clause)
+ {
+ ewcl = lappend(ewcl, makeString(cte->search_clause->search_seq_column));
+ }
+ if (cte->cycle_clause)
+ {
+ ewcl = lappend(ewcl, makeString(cte->cycle_clause->cycle_mark_column));
+ ewcl = lappend(ewcl, makeString(cte->cycle_clause->cycle_path_column));
+ }
+ newrte->alias = makeAlias("*TROCRN*", ewcl);
+ newrte->eref = newrte->alias;
+
+ /*
+ * Find the reference to our CTE in the range table
+ */
+ for (int rti = 1; rti <= list_length(rte2->subquery->rtable); rti++)
+ {
+ RangeTblEntry *e = rt_fetch(rti, rte2->subquery->rtable);
+
+ if (e->rtekind == RTE_CTE && strcmp(cte->ctename, e->ctename) == 0)
+ {
+ cte_rtindex = rti;
+ break;
+ }
+ }
+ Assert(cte_rtindex > 0);
+
+ newsubquery = copyObject(rte2->subquery);
+ IncrementVarSublevelsUp((Node *) newsubquery, 1, 1);
+
+ /*
+ * Add extra columns to target list of subquery of right subquery
+ */
+ if (cte->search_clause)
+ {
+ Var *var;
+
+ /* ctename.sqc */
+ var = makeVar(cte_rtindex, sqc_attno,
+ search_seq_type, -1, InvalidOid, 0);
+ tle = makeTargetEntry((Expr *) var,
+ list_length(newsubquery->targetList) + 1,
+ cte->search_clause->search_seq_column,
+ false);
+ newsubquery->targetList = lappend(newsubquery->targetList, tle);
+ }
+ if (cte->cycle_clause)
+ {
+ Var *var;
+
+ /* ctename.cmc */
+ var = makeVar(cte_rtindex, cmc_attno,
+ cte->cycle_clause->cycle_mark_type,
+ cte->cycle_clause->cycle_mark_typmod,
+ cte->cycle_clause->cycle_mark_collation, 0);
+ tle = makeTargetEntry((Expr *) var,
+ list_length(newsubquery->targetList) + 1,
+ cte->cycle_clause->cycle_mark_column,
+ false);
+ newsubquery->targetList = lappend(newsubquery->targetList, tle);
+
+ /* ctename.cpa */
+ var = makeVar(cte_rtindex, cpa_attno,
+ RECORDARRAYOID, -1, InvalidOid, 0);
+ tle = makeTargetEntry((Expr *) var,
+ list_length(newsubquery->targetList) + 1,
+ cte->cycle_clause->cycle_path_column,
+ false);
+ newsubquery->targetList = lappend(newsubquery->targetList, tle);
+ }
+
+ newrte->subquery = newsubquery;
+ newrte->inFromCl = true;
+ newq2->rtable = list_make1(newrte);
+
+ rtr = makeNode(RangeTblRef);
+ rtr->rtindex = 1;
+
+ if (cte->cycle_clause)
+ {
+ Expr *expr;
+
+ /*
+ * Add cmc <> cmv condition
+ */
+ expr = make_opclause(cte->cycle_clause->cycle_mark_neop, BOOLOID, false,
+ (Expr *) makeVar(1, cmc_attno,
+ cte->cycle_clause->cycle_mark_type,
+ cte->cycle_clause->cycle_mark_typmod,
+ cte->cycle_clause->cycle_mark_collation, 0),
+ (Expr *) cte->cycle_clause->cycle_mark_value,
+ InvalidOid,
+ cte->cycle_clause->cycle_mark_collation);
+
+ newq2->jointree = makeFromExpr(list_make1(rtr), (Node *) expr);
+ }
+ else
+ newq2->jointree = makeFromExpr(list_make1(rtr), NULL);
+
+ /*
+ * Make target list
+ */
+ for (int i = 0; i < list_length(cte->ctecolnames); i++)
+ {
+ Var *var;
+
+ var = makeVar(1, i + 1,
+ list_nth_oid(cte->ctecoltypes, i),
+ list_nth_int(cte->ctecoltypmods, i),
+ list_nth_oid(cte->ctecolcollations, i),
+ 0);
+ tle = makeTargetEntry((Expr *) var, i + 1, strVal(list_nth(cte->ctecolnames, i)), false);
+ tle->resorigtbl = castNode(TargetEntry, list_nth(rte2->subquery->targetList, i))->resorigtbl;
+ tle->resorigcol = castNode(TargetEntry, list_nth(rte2->subquery->targetList, i))->resorigcol;
+ newq2->targetList = lappend(newq2->targetList, tle);
+ }
+
+ if (cte->search_clause)
+ {
+ Expr *texpr;
+
+ if (cte->search_clause->search_breadth_first)
+ {
+ FieldSelect *fs;
+ FuncExpr *fexpr;
+
+ /*
+ * ROW(sqc.depth + 1, cols)
+ */
+
+ search_col_rowexpr = copyObject(search_col_rowexpr);
+
+ fs = makeNode(FieldSelect);
+ fs->arg = (Expr *) makeVar(1, sqc_attno, RECORDOID, -1, 0, 0);
+ fs->fieldnum = 1;
+ fs->resulttype = INT8OID;
+ fs->resulttypmod = -1;
+
+ fexpr = makeFuncExpr(F_INT8INC, INT8OID, list_make1(fs), InvalidOid, InvalidOid, COERCE_EXPLICIT_CALL);
+
+ lfirst(list_head(search_col_rowexpr->args)) = fexpr;
+
+ texpr = (Expr *) search_col_rowexpr;
+ }
+ else
+ {
+ /*
+ * sqc || ARRAY[ROW(cols)]
+ */
+ texpr = make_path_cat_expr(search_col_rowexpr, sqc_attno);
+ }
+ tle = makeTargetEntry(texpr,
+ list_length(newq2->targetList) + 1,
+ cte->search_clause->search_seq_column,
+ false);
+ newq2->targetList = lappend(newq2->targetList, tle);
+ }
+
+ if (cte->cycle_clause)
+ {
+ ScalarArrayOpExpr *saoe;
+ CaseExpr *caseexpr;
+ CaseWhen *casewhen;
+
+ /*
+ * CASE WHEN ROW(cols) = ANY (ARRAY[cpa]) THEN cmv ELSE cmd END
+ */
+
+ saoe = makeNode(ScalarArrayOpExpr);
+ saoe->location = -1;
+ saoe->opno = RECORD_EQ_OP;
+ saoe->useOr = true;
+ saoe->args = list_make2(cycle_col_rowexpr,
+ makeVar(1, cpa_attno, RECORDARRAYOID, -1, 0, 0));
+
+ caseexpr = makeNode(CaseExpr);
+ caseexpr->location = -1;
+ caseexpr->casetype = cte->cycle_clause->cycle_mark_type;
+ caseexpr->casecollid = cte->cycle_clause->cycle_mark_collation;
+ casewhen = makeNode(CaseWhen);
+ casewhen->location = -1;
+ casewhen->expr = (Expr *) saoe;
+ casewhen->result = (Expr *) cte->cycle_clause->cycle_mark_value;
+ caseexpr->args = list_make1(casewhen);
+ caseexpr->defresult = (Expr *) cte->cycle_clause->cycle_mark_default;
+
+ tle = makeTargetEntry((Expr *) caseexpr,
+ list_length(newq2->targetList) + 1,
+ cte->cycle_clause->cycle_mark_column,
+ false);
+ newq2->targetList = lappend(newq2->targetList, tle);
+
+ /*
+ * cpa || ARRAY[ROW(cols)]
+ */
+ tle = makeTargetEntry(make_path_cat_expr(cycle_col_rowexpr, cpa_attno),
+ list_length(newq2->targetList) + 1,
+ cte->cycle_clause->cycle_path_column,
+ false);
+ newq2->targetList = lappend(newq2->targetList, tle);
+ }
+
+ rte2->subquery = newq2;
+
+ if (cte->search_clause)
+ {
+ rte2->eref->colnames = lappend(rte2->eref->colnames, makeString(cte->search_clause->search_seq_column));
+ }
+ if (cte->cycle_clause)
+ {
+ rte2->eref->colnames = lappend(rte2->eref->colnames, makeString(cte->cycle_clause->cycle_mark_column));
+ rte2->eref->colnames = lappend(rte2->eref->colnames, makeString(cte->cycle_clause->cycle_path_column));
+ }
+
+ /*
+ * Add the additional columns to the SetOperationStmt
+ */
+ if (cte->search_clause)
+ {
+ sos->colTypes = lappend_oid(sos->colTypes, search_seq_type);
+ sos->colTypmods = lappend_int(sos->colTypmods, -1);
+ sos->colCollations = lappend_oid(sos->colCollations, InvalidOid);
+ if (!sos->all)
+ sos->groupClauses = lappend(sos->groupClauses,
+ makeSortGroupClauseForSetOp(search_seq_type));
+ }
+ if (cte->cycle_clause)
+ {
+ sos->colTypes = lappend_oid(sos->colTypes, cte->cycle_clause->cycle_mark_type);
+ sos->colTypmods = lappend_int(sos->colTypmods, cte->cycle_clause->cycle_mark_typmod);
+ sos->colCollations = lappend_oid(sos->colCollations, cte->cycle_clause->cycle_mark_collation);
+ if (!sos->all)
+ sos->groupClauses = lappend(sos->groupClauses,
+ makeSortGroupClauseForSetOp(cte->cycle_clause->cycle_mark_type));
+
+ sos->colTypes = lappend_oid(sos->colTypes, RECORDARRAYOID);
+ sos->colTypmods = lappend_int(sos->colTypmods, -1);
+ sos->colCollations = lappend_oid(sos->colCollations, InvalidOid);
+ if (!sos->all)
+ sos->groupClauses = lappend(sos->groupClauses,
+ makeSortGroupClauseForSetOp(RECORDARRAYOID));
+ }
+
+ /*
+ * Add the additional columns to the CTE query's target list
+ */
+ if (cte->search_clause)
+ {
+ ctequery->targetList = lappend(ctequery->targetList,
+ makeTargetEntry((Expr *) makeVar(1, sqc_attno,
+ search_seq_type, -1, InvalidOid, 0),
+ list_length(ctequery->targetList) + 1,
+ cte->search_clause->search_seq_column,
+ false));
+ }
+ if (cte->cycle_clause)
+ {
+ ctequery->targetList = lappend(ctequery->targetList,
+ makeTargetEntry((Expr *) makeVar(1, cmc_attno,
+ cte->cycle_clause->cycle_mark_type,
+ cte->cycle_clause->cycle_mark_typmod,
+ cte->cycle_clause->cycle_mark_collation, 0),
+ list_length(ctequery->targetList) + 1,
+ cte->cycle_clause->cycle_mark_column,
+ false));
+ ctequery->targetList = lappend(ctequery->targetList,
+ makeTargetEntry((Expr *) makeVar(1, cpa_attno,
+ RECORDARRAYOID, -1, InvalidOid, 0),
+ list_length(ctequery->targetList) + 1,
+ cte->cycle_clause->cycle_path_column,
+ false));
+ }
+
+ /*
+ * Add the additional columns to the CTE's output columns
+ */
+ cte->ctecolnames = ewcl;
+ if (cte->search_clause)
+ {
+ cte->ctecoltypes = lappend_oid(cte->ctecoltypes, search_seq_type);
+ cte->ctecoltypmods = lappend_int(cte->ctecoltypmods, -1);
+ cte->ctecolcollations = lappend_oid(cte->ctecolcollations, InvalidOid);
+ }
+ if (cte->cycle_clause)
+ {
+ cte->ctecoltypes = lappend_oid(cte->ctecoltypes, cte->cycle_clause->cycle_mark_type);
+ cte->ctecoltypmods = lappend_int(cte->ctecoltypmods, cte->cycle_clause->cycle_mark_typmod);
+ cte->ctecolcollations = lappend_oid(cte->ctecolcollations, cte->cycle_clause->cycle_mark_collation);
+
+ cte->ctecoltypes = lappend_oid(cte->ctecoltypes, RECORDARRAYOID);
+ cte->ctecoltypmods = lappend_int(cte->ctecoltypmods, -1);
+ cte->ctecolcollations = lappend_oid(cte->ctecolcollations, InvalidOid);
+ }
+
+ return cte;
+}
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 1a844bc4613..4a9244f4f66 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -5168,6 +5168,53 @@ get_with_clause(Query *query, deparse_context *context)
if (PRETTY_INDENT(context))
appendContextKeyword(context, "", 0, 0, 0);
appendStringInfoChar(buf, ')');
+
+ if (cte->search_clause)
+ {
+ bool first = true;
+ ListCell *lc;
+
+ appendStringInfo(buf, " SEARCH %s FIRST BY ",
+ cte->search_clause->search_breadth_first ? "BREADTH" : "DEPTH");
+
+ foreach(lc, cte->search_clause->search_col_list)
+ {
+ if (first)
+ first = false;
+ else
+ appendStringInfoString(buf, ", ");
+ appendStringInfoString(buf,
+ quote_identifier(strVal(lfirst(lc))));
+ }
+
+ appendStringInfo(buf, " SET %s", quote_identifier(cte->search_clause->search_seq_column));
+ }
+
+ if (cte->cycle_clause)
+ {
+ bool first = true;
+ ListCell *lc;
+
+ appendStringInfoString(buf, " CYCLE ");
+
+ foreach(lc, cte->cycle_clause->cycle_col_list)
+ {
+ if (first)
+ first = false;
+ else
+ appendStringInfoString(buf, ", ");
+ appendStringInfoString(buf,
+ quote_identifier(strVal(lfirst(lc))));
+ }
+
+ appendStringInfo(buf, " SET %s", quote_identifier(cte->cycle_clause->cycle_mark_column));
+ appendStringInfoString(buf, " TO ");
+ get_rule_expr(cte->cycle_clause->cycle_mark_value, context, false);
+ appendStringInfoString(buf, " DEFAULT ");
+ get_rule_expr(cte->cycle_clause->cycle_mark_default, context, false);
+ appendStringInfo(buf, " USING %s", quote_identifier(cte->cycle_clause->cycle_path_column));
+ }
+
sep = ", ";
}
generated by cgit v1.2.3 (git 2.39.1) at 2025-06-18 04:15:31 +0000