1 files changed, 55 insertions, 0 deletions
diff --git a/src/include/executor/functions.h b/src/include/executor/functions.h
new file mode 100644
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+++ b/src/include/executor/functions.h
@@ -0,0 +1,55 @@
+/*-------------------------------------------------------------------------
+ *
+ * functions.h
+ *		Declarations for execution of SQL-language functions.
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/executor/functions.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef FUNCTIONS_H
+#define FUNCTIONS_H
+
+#include "nodes/execnodes.h"
+#include "tcop/dest.h"
+
+/*
+ * Data structure needed by the parser callback hooks to resolve parameter
+ * references during parsing of a SQL function's body.  This is separate from
+ * SQLFunctionCache since we sometimes do parsing separately from execution.
+ */
+typedef struct SQLFunctionParseInfo
+{
+	char	   *fname;			/* function's name */
+	int			nargs;			/* number of input arguments */
+	Oid		   *argtypes;		/* resolved types of input arguments */
+	char	  **argnames;		/* names of input arguments; NULL if none */
+	/* Note that argnames[i] can be NULL, if some args are unnamed */
+	Oid			collation;		/* function's input collation, if known */
+} SQLFunctionParseInfo;
+
+typedef SQLFunctionParseInfo *SQLFunctionParseInfoPtr;
+
+extern Datum fmgr_sql(PG_FUNCTION_ARGS);
+
+extern SQLFunctionParseInfoPtr prepare_sql_fn_parse_info(HeapTuple procedureTuple,
+														 Node *call_expr,
+														 Oid inputCollation);
+
+extern void sql_fn_parser_setup(struct ParseState *pstate,
+								SQLFunctionParseInfoPtr pinfo);
+
+extern void check_sql_fn_statements(List *queryTreeLists);
+
+extern bool check_sql_fn_retval(List *queryTreeLists,
+								Oid rettype, TupleDesc rettupdesc,
+								bool insertDroppedCols,
+								List **resultTargetList);
+
+extern DestReceiver *CreateSQLFunctionDestReceiver(void);
+
+#endif							/* FUNCTIONS_H */