1 files changed, 100 insertions, 0 deletions
diff --git a/src/include/parser/parse_coerce.h b/src/include/parser/parse_coerce.h
new file mode 100644
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--- /dev/null
+++ b/src/include/parser/parse_coerce.h
@@ -0,0 +1,100 @@
+/*-------------------------------------------------------------------------
+ *
+ * parse_coerce.h
+ *	Routines for type coercion.
+ *
+ *
+ * Portions Copyright (c) 1996-2021, 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, const Oid *input_typeids, const 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,
+							  CoercionContext ccontext, CoercionForm cformat, int location,
+							  bool hideInputCoercion);
+
+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 Node *coerce_to_specific_type_typmod(ParseState *pstate, Node *node,
+											Oid targetTypeId, int32 targetTypmod,
+											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 verify_common_type(Oid common_type, List *exprs);
+
+extern int32 select_common_typmod(ParseState *pstate, List *exprs, Oid common_type);
+
+extern bool check_generic_type_consistency(const Oid *actual_arg_types,
+										   const Oid *declared_arg_types,
+										   int nargs);
+extern Oid	enforce_generic_type_consistency(const Oid *actual_arg_types,
+											 Oid *declared_arg_types,
+											 int nargs,
+											 Oid rettype,
+											 bool allow_poly);
+
+extern char *check_valid_polymorphic_signature(Oid ret_type,
+											   const Oid *declared_arg_types,
+											   int nargs);
+extern char *check_valid_internal_signature(Oid ret_type,
+											const Oid *declared_arg_types,
+											int nargs);
+
+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 */