init

2026-04-07 13:35:22 +08:00
commit 0120fa9ce3
1530 changed files with 424864 additions and 0 deletions
--- a/pg_include/parser/parse_coerce.h
+++ b/pg_include/parser/parse_coerce.h
@@ -0,0 +1,90 @@
+/*-------------------------------------------------------------------------
+ *
+ * parse_coerce.h
+ *	Routines for type coercion.
+ *
+ *
+ * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/parser/parse_coerce.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PARSE_COERCE_H
+#define PARSE_COERCE_H
+
+#include "parser/parse_node.h"
+
+
+/* Type categories (see TYPCATEGORY_xxx symbols in catalog/pg_type.h) */
+typedef char TYPCATEGORY;
+
+/* Result codes for find_coercion_pathway */
+typedef enum CoercionPathType
+{
+	COERCION_PATH_NONE,			/* failed to find any coercion pathway */
+	COERCION_PATH_FUNC,			/* apply the specified coercion function */
+	COERCION_PATH_RELABELTYPE,	/* binary-compatible cast, no function */
+	COERCION_PATH_ARRAYCOERCE,	/* need an ArrayCoerceExpr node */
+	COERCION_PATH_COERCEVIAIO	/* need a CoerceViaIO node */
+} CoercionPathType;
+
+
+extern bool IsBinaryCoercible(Oid srctype, Oid targettype);
+extern bool IsPreferredType(TYPCATEGORY category, Oid type);
+extern TYPCATEGORY TypeCategory(Oid type);
+
+extern Node *coerce_to_target_type(ParseState *pstate,
+					  Node *expr, Oid exprtype,
+					  Oid targettype, int32 targettypmod,
+					  CoercionContext ccontext,
+					  CoercionForm cformat,
+					  int location);
+extern bool can_coerce_type(int nargs, Oid *input_typeids, Oid *target_typeids,
+				CoercionContext ccontext);
+extern Node *coerce_type(ParseState *pstate, Node *node,
+			Oid inputTypeId, Oid targetTypeId, int32 targetTypeMod,
+			CoercionContext ccontext, CoercionForm cformat, int location);
+extern Node *coerce_to_domain(Node *arg, Oid baseTypeId, int32 baseTypeMod,
+				 Oid typeId,
+				 CoercionForm cformat, int location,
+				 bool hideInputCoercion,
+				 bool lengthCoercionDone);
+
+extern Node *coerce_to_boolean(ParseState *pstate, Node *node,
+				  const char *constructName);
+extern Node *coerce_to_specific_type(ParseState *pstate, Node *node,
+						Oid targetTypeId,
+						const char *constructName);
+
+extern int parser_coercion_errposition(ParseState *pstate,
+							int coerce_location,
+							Node *input_expr);
+
+extern Oid select_common_type(ParseState *pstate, List *exprs,
+				   const char *context, Node **which_expr);
+extern Node *coerce_to_common_type(ParseState *pstate, Node *node,
+					  Oid targetTypeId,
+					  const char *context);
+
+extern bool check_generic_type_consistency(Oid *actual_arg_types,
+							   Oid *declared_arg_types,
+							   int nargs);
+extern Oid enforce_generic_type_consistency(Oid *actual_arg_types,
+								 Oid *declared_arg_types,
+								 int nargs,
+								 Oid rettype,
+								 bool allow_poly);
+extern Oid resolve_generic_type(Oid declared_type,
+					 Oid context_actual_type,
+					 Oid context_declared_type);
+
+extern CoercionPathType find_coercion_pathway(Oid targetTypeId,
+					  Oid sourceTypeId,
+					  CoercionContext ccontext,
+					  Oid *funcid);
+extern CoercionPathType find_typmod_coercion_function(Oid typeId,
+							  Oid *funcid);
+
+#endif   /* PARSE_COERCE_H */