Add SQL/JSON parsing

Author: Nikita Glukhov

src/backend/nodes/makefuncs.c

@@ -20,6 +20,7 @@
 #include "fmgr.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
+#include "utils/errcodes.h"
 #include "utils/lsyscache.h"
 
 
@@ -611,3 +612,56 @@ makeGroupingSet(GroupingSetKind kind, List *content, int location)
 	n->location = location;
 	return n;
 }
+
+Node *
+makeJsonBehavior(JsonBehaviorKind kind, Node *expr)
+{
+	JsonBehavior *n = makeNode(JsonBehavior);
+
+	n->kind = kind;
+	n->expr = expr;
+
+	return (Node *) n;
+}
+
+JsonEncoding
+makeJsonEncoding(char *name)
+{
+	if (!pg_strcasecmp(name, "utf8"))
+		return JS_ENC_UTF8;
+	if (!pg_strcasecmp(name, "utf16"))
+		return JS_ENC_UTF16;
+	if (!pg_strcasecmp(name, "utf32"))
+		return JS_ENC_UTF32;
+
+	ereport(ERROR,
+			(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+			 errmsg("unrecognized JSON encoding: %s", name)));
+
+	return JS_ENC_DEFAULT;
+}
+
+Node *
+makeJsonKeyValue(Node *key, Node *value)
+{
+	JsonKeyValue *n = makeNode(JsonKeyValue);
+
+	n->key = (Expr *) key;
+	n->value = castNode(JsonValueExpr, value);
+
+	return (Node *) n;
+}
+
+Node *
+makeJsonPredicate(Node *expr, JsonFormat format, JsonValueType vtype,
+				  bool unique_keys)
+{
+	JsonIsPredicate *n = makeNode(JsonIsPredicate);
+
+	n->expr = expr;
+	n->format = format;
+	n->vtype = vtype;
+	n->unique_keys = unique_keys;
+
+	return (Node *) n;
+}