Fix crash when partitioned column specified twice.

Amit Langote, reviewed by Beena Emerson

Discussion: http://postgr.es/m/6ed23d3d-c09d-4cbc-3628-0a8a32f750f4@lab.ntt.co.jp

Author: robertmhaas

src/backend/commands/sequence.c

@@ -167,6 +167,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 		coldef->is_local = true;
 		coldef->is_not_null = true;
 		coldef->is_from_type = false;
+		coldef->is_from_parent = false;
 		coldef->storage = 0;
 		coldef->raw_default = NULL;
 		coldef->cooked_default = NULL;

src/backend/commands/tablecmds.c

@@ -1919,6 +1919,7 @@ MergeAttributes(List *schema, List *supers, char relpersistence,
 				def->is_local = false;
 				def->is_not_null = attribute->attnotnull;
 				def->is_from_type = false;
+				def->is_from_parent = true;
 				def->storage = attribute->attstorage;
 				def->raw_default = NULL;
 				def->cooked_default = NULL;
@@ -2206,11 +2207,20 @@ MergeAttributes(List *schema, List *supers, char relpersistence,
 					 * merge the column options into the column from the
 					 * parent
 					 */
-					coldef->is_not_null = restdef->is_not_null;
-					coldef->raw_default = restdef->raw_default;
-					coldef->cooked_default = restdef->cooked_default;
-					coldef->constraints = restdef->constraints;
-					list_delete_cell(schema, rest, prev);
+					if (coldef->is_from_parent)
+					{
+						coldef->is_not_null = restdef->is_not_null;
+						coldef->raw_default = restdef->raw_default;
+						coldef->cooked_default = restdef->cooked_default;
+						coldef->constraints = restdef->constraints;
+						coldef->is_from_parent = false;
+						list_delete_cell(schema, rest, prev);
+					}
+					else
+						ereport(ERROR,
+								(errcode(ERRCODE_DUPLICATE_COLUMN),
+								 errmsg("column \"%s\" specified more than once",
+										coldef->colname)));
 				}
 				prev = rest;
 				rest = next;

src/backend/nodes/copyfuncs.c

@@ -2804,6 +2804,7 @@ _copyColumnDef(const ColumnDef *from)
 	COPY_SCALAR_FIELD(is_local);
 	COPY_SCALAR_FIELD(is_not_null);
 	COPY_SCALAR_FIELD(is_from_type);
+	COPY_SCALAR_FIELD(is_from_parent);
 	COPY_SCALAR_FIELD(storage);
 	COPY_NODE_FIELD(raw_default);
 	COPY_NODE_FIELD(cooked_default);

src/backend/nodes/equalfuncs.c

@@ -2540,6 +2540,7 @@ _equalColumnDef(const ColumnDef *a, const ColumnDef *b)
 	COMPARE_SCALAR_FIELD(is_local);
 	COMPARE_SCALAR_FIELD(is_not_null);
 	COMPARE_SCALAR_FIELD(is_from_type);
+	COMPARE_SCALAR_FIELD(is_from_parent);
 	COMPARE_SCALAR_FIELD(storage);
 	COMPARE_NODE_FIELD(raw_default);
 	COMPARE_NODE_FIELD(cooked_default);

src/backend/nodes/makefuncs.c

@@ -494,6 +494,7 @@ makeColumnDef(const char *colname, Oid typeOid, int32 typmod, Oid collOid)
 	n->is_local = true;
 	n->is_not_null = false;
 	n->is_from_type = false;
+	n->is_from_parent = false;
 	n->storage = 0;
 	n->raw_default = NULL;
 	n->cooked_default = NULL;

src/backend/nodes/outfuncs.c

@@ -2766,6 +2766,7 @@ _outColumnDef(StringInfo str, const ColumnDef *node)
 	WRITE_BOOL_FIELD(is_local);
 	WRITE_BOOL_FIELD(is_not_null);
 	WRITE_BOOL_FIELD(is_from_type);
+	WRITE_BOOL_FIELD(is_from_parent);
 	WRITE_CHAR_FIELD(storage);
 	WRITE_NODE_FIELD(raw_default);
 	WRITE_NODE_FIELD(cooked_default);

src/backend/parser/gram.y

@@ -3253,6 +3253,7 @@ columnDef:	ColId Typename create_generic_options ColQualList
 					n->is_local = true;
 					n->is_not_null = false;
 					n->is_from_type = false;
+					n->is_from_parent = false;
 					n->storage = 0;
 					n->raw_default = NULL;
 					n->cooked_default = NULL;
@@ -3274,6 +3275,7 @@ columnOptions:	ColId ColQualList
 					n->is_local = true;
 					n->is_not_null = false;
 					n->is_from_type = false;
+					n->is_from_parent = false;
 					n->storage = 0;
 					n->raw_default = NULL;
 					n->cooked_default = NULL;
@@ -3292,6 +3294,7 @@ columnOptions:	ColId ColQualList
 					n->is_local = true;
 					n->is_not_null = false;
 					n->is_from_type = false;
+					n->is_from_parent = false;
 					n->storage = 0;
 					n->raw_default = NULL;
 					n->cooked_default = NULL;
@@ -11888,6 +11891,7 @@ TableFuncElement:	ColId Typename opt_collate_clause
 					n->is_local = true;
 					n->is_not_null = false;
 					n->is_from_type = false;
+					n->is_from_parent = false;
 					n->storage = 0;
 					n->raw_default = NULL;
 					n->cooked_default = NULL;

src/backend/parser/parse_utilcmd.c

@@ -983,6 +983,7 @@ transformTableLikeClause(CreateStmtContext *cxt, TableLikeClause *table_like_cla
 		def->is_local = true;
 		def->is_not_null = attribute->attnotnull;
 		def->is_from_type = false;
+		def->is_from_parent = false;
 		def->storage = 0;
 		def->raw_default = NULL;
 		def->cooked_default = NULL;
@@ -1221,6 +1222,7 @@ transformOfType(CreateStmtContext *cxt, TypeName *ofTypename)
 		n->is_local = true;
 		n->is_not_null = false;
 		n->is_from_type = true;
+		n->is_from_parent = false;
 		n->storage = 0;
 		n->raw_default = NULL;
 		n->cooked_default = NULL;

src/include/nodes/parsenodes.h

@@ -643,6 +643,7 @@ typedef struct ColumnDef
 	bool		is_local;		/* column has local (non-inherited) def'n */
 	bool		is_not_null;	/* NOT NULL constraint specified? */
 	bool		is_from_type;	/* column definition came from table type */
+	bool		is_from_parent;	/* column def came from partition parent */
 	char		storage;		/* attstorage setting, or 0 for default */
 	Node	   *raw_default;	/* default value (untransformed parse tree) */
 	Node	   *cooked_default; /* default value (transformed expr tree) */

src/test/regress/expected/create_table.out

@@ -609,6 +609,14 @@ SELECT attname, attislocal, attinhcount FROM pg_attribute
 (2 rows)
 
 -- able to specify column default, column constraint, and table constraint
+-- first check the "column specified more than once" error
+CREATE TABLE part_b PARTITION OF parted (
+	b NOT NULL,
+	b DEFAULT 1,
+	b CHECK (b >= 0),
+	CONSTRAINT check_a CHECK (length(a) > 0)
+) FOR VALUES IN ('b');
+ERROR:  column "b" specified more than once
 CREATE TABLE part_b PARTITION OF parted (
 	b NOT NULL DEFAULT 1 CHECK (b >= 0),
 	CONSTRAINT check_a CHECK (length(a) > 0)

src/test/regress/sql/create_table.sql

@@ -569,6 +569,15 @@ SELECT attname, attislocal, attinhcount FROM pg_attribute
   ORDER BY attnum;
 
 -- able to specify column default, column constraint, and table constraint
+
+-- first check the "column specified more than once" error
+CREATE TABLE part_b PARTITION OF parted (
+	b NOT NULL,
+	b DEFAULT 1,
+	b CHECK (b >= 0),
+	CONSTRAINT check_a CHECK (length(a) > 0)
+) FOR VALUES IN ('b');
+
 CREATE TABLE part_b PARTITION OF parted (
 	b NOT NULL DEFAULT 1 CHECK (b >= 0),
 	CONSTRAINT check_a CHECK (length(a) > 0)