Setup cursor position for schema-qualified elements

This makes any errors thrown while looking up such schemas report the
position of the error.

Author: Ryan Kelly
Reviewed by: Jeevan Chalke, Tom Lane

src/backend/parser/parse_func.c

@@ -93,6 +93,7 @@ ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs,
 	Oid			vatype;
 	FuncDetailCode fdresult;
 	char		aggkind = 0;
+	ParseCallbackState pcbstate;
 
 	/*
 	 * If there's an aggregate filter, transform it using transformWhereClause
@@ -235,12 +236,18 @@ ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs,
 	 * type.  We'll fix up the variadic case below.  We may also have to deal
 	 * with default arguments.
 	 */
+
+	setup_parser_errposition_callback(&pcbstate, pstate, location);
+
 	fdresult = func_get_detail(funcname, fargs, argnames, nargs,
 							   actual_arg_types,
 							   !func_variadic, true,
 							   &funcid, &rettype, &retset,
 							   &nvargs, &vatype,
 							   &declared_arg_types, &argdefaults);
+
+	cancel_parser_errposition_callback(&pcbstate);
+
 	if (fdresult == FUNCDETAIL_COERCION)
 	{
 		/*

src/backend/parser/parse_oper.c

@@ -75,8 +75,9 @@ static const char *op_signature_string(List *op, char oprkind,
 static void op_error(ParseState *pstate, List *op, char oprkind,
 		 Oid arg1, Oid arg2,
 		 FuncDetailCode fdresult, int location);
-static bool make_oper_cache_key(OprCacheKey *key, List *opname,
+static bool make_oper_cache_key(ParseState *pstate, OprCacheKey *key,
-					Oid ltypeId, Oid rtypeId);
+					List *opname, Oid ltypeId, Oid rtypeId,
+					int location);
 static Oid	find_oper_cache_entry(OprCacheKey *key);
 static void make_oper_cache_entry(OprCacheKey *key, Oid opr_oid);
 static void InvalidateOprCacheCallBack(Datum arg, int cacheid, uint32 hashvalue);
@@ -383,7 +384,8 @@ oper(ParseState *pstate, List *opname, Oid ltypeId, Oid rtypeId,
 	/*
 	 * Try to find the mapping in the lookaside cache.
 	 */
-	key_ok = make_oper_cache_key(&key, opname, ltypeId, rtypeId);
+	key_ok = make_oper_cache_key(pstate, &key, opname, ltypeId, rtypeId, location);
+
 	if (key_ok)
 	{
 		operOid = find_oper_cache_entry(&key);
@@ -529,7 +531,8 @@ right_oper(ParseState *pstate, List *op, Oid arg, bool noError, int location)
 	/*
 	 * Try to find the mapping in the lookaside cache.
 	 */
-	key_ok = make_oper_cache_key(&key, op, arg, InvalidOid);
+	key_ok = make_oper_cache_key(pstate, &key, op, arg, InvalidOid, location);
+
 	if (key_ok)
 	{
 		operOid = find_oper_cache_entry(&key);
@@ -607,7 +610,8 @@ left_oper(ParseState *pstate, List *op, Oid arg, bool noError, int location)
 	/*
 	 * Try to find the mapping in the lookaside cache.
 	 */
-	key_ok = make_oper_cache_key(&key, op, InvalidOid, arg);
+	key_ok = make_oper_cache_key(pstate, &key, op, InvalidOid, arg, location);
+
 	if (key_ok)
 	{
 		operOid = find_oper_cache_entry(&key);
@@ -1006,9 +1010,13 @@ static HTAB *OprCacheHash = NULL;
  *
  * Returns TRUE if successful, FALSE if the search_path overflowed
  * (hence no caching is possible).
+ *
+ * pstate/location are used only to report the error position; pass NULL/-1
+ * if not available.
  */
 static bool
-make_oper_cache_key(OprCacheKey *key, List *opname, Oid ltypeId, Oid rtypeId)
+make_oper_cache_key(ParseState *pstate, OprCacheKey *key, List *opname,
+					Oid ltypeId, Oid rtypeId, int location)
 {
 	char	   *schemaname;
 	char	   *opername;
@@ -1026,8 +1034,12 @@ make_oper_cache_key(OprCacheKey *key, List *opname, Oid ltypeId, Oid rtypeId)
 
 	if (schemaname)
 	{
+		ParseCallbackState pcbstate;
+
 		/* search only in exact schema given */
+		setup_parser_errposition_callback(&pcbstate, pstate, location);
 		key->search_path[0] = LookupExplicitNamespace(schemaname, false);
+		cancel_parser_errposition_callback(&pcbstate);
 	}
 	else
 	{

src/backend/parser/parse_type.c

@@ -156,6 +156,9 @@ LookupTypeName(ParseState *pstate, const TypeName *typeName,
 		{
 			/* Look in specific schema only */
 			Oid			namespaceId;
+			ParseCallbackState pcbstate;
+
+			setup_parser_errposition_callback(&pcbstate, pstate, typeName->location);
 
 			namespaceId = LookupExplicitNamespace(schemaname, missing_ok);
 			if (OidIsValid(namespaceId))
@@ -164,6 +167,8 @@ LookupTypeName(ParseState *pstate, const TypeName *typeName,
 										 ObjectIdGetDatum(namespaceId));
 			else
 				typoid = InvalidOid;
+
+			cancel_parser_errposition_callback(&pcbstate);
 		}
 		else
 		{

src/backend/parser/parse_utilcmd.c

@@ -149,6 +149,7 @@ transformCreateStmt(CreateStmt *stmt, const char *queryString)
 	ListCell   *elements;
 	Oid			namespaceid;
 	Oid			existing_relid;
+	ParseCallbackState pcbstate;
 
 	/*
 	 * We must not scribble on the passed-in CreateStmt, so copy it.  (This is
@@ -156,15 +157,22 @@ transformCreateStmt(CreateStmt *stmt, const char *queryString)
 	 */
 	stmt = (CreateStmt *) copyObject(stmt);
 
+	/* Set up pstate */
+	pstate = make_parsestate(NULL);
+	pstate->p_sourcetext = queryString;
+
 	/*
 	 * Look up the creation namespace.  This also checks permissions on the
 	 * target namespace, locks it against concurrent drops, checks for a
 	 * preexisting relation in that namespace with the same name, and updates
 	 * stmt->relation->relpersistence if the selected namespace is temporary.
 	 */
+	setup_parser_errposition_callback(&pcbstate, pstate,
+									  stmt->relation->location);
 	namespaceid =
 		RangeVarGetAndCheckCreationNamespace(stmt->relation, NoLock,
 											 &existing_relid);
+	cancel_parser_errposition_callback(&pcbstate);
 
 	/*
 	 * If the relation already exists and the user specified "IF NOT EXISTS",
@@ -190,10 +198,7 @@ transformCreateStmt(CreateStmt *stmt, const char *queryString)
 		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
 		stmt->relation->schemaname = get_namespace_name(namespaceid);
 
-	/* Set up pstate and CreateStmtContext */
+	/* Set up CreateStmtContext */
-	pstate = make_parsestate(NULL);
-	pstate->p_sourcetext = queryString;
-
 	cxt.pstate = pstate;
 	if (IsA(stmt, CreateForeignTableStmt))
 	{

src/test/regress/expected/create_table.out

@@ -212,11 +212,15 @@ INSERT INTO unlogged1 VALUES (42);
 CREATE UNLOGGED TABLE public.unlogged2 (a int primary key);		-- also OK
 CREATE UNLOGGED TABLE pg_temp.unlogged3 (a int primary key);	-- not OK
 ERROR:  only temporary relations may be created in temporary schemas
+LINE 1: CREATE UNLOGGED TABLE pg_temp.unlogged3 (a int primary key);
+                              ^
 CREATE TABLE pg_temp.implicitly_temp (a int primary key);		-- OK
 CREATE TEMP TABLE explicitly_temp (a int primary key);			-- also OK
 CREATE TEMP TABLE pg_temp.doubly_temp (a int primary key);		-- also OK
 CREATE TEMP TABLE public.temp_to_perm (a int primary key);		-- not OK
 ERROR:  cannot create temporary relation in non-temporary schema
+LINE 1: CREATE TEMP TABLE public.temp_to_perm (a int primary key);
+                          ^
 DROP TABLE unlogged1, public.unlogged2;
 CREATE TABLE as_select1 AS SELECT * FROM pg_class WHERE relkind = 'r';
 CREATE TABLE as_select1 AS SELECT * FROM pg_class WHERE relkind = 'r';