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-rw-r--r--src/include/parser/parse_coerce.h100
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diff --git a/src/include/parser/parse_coerce.h b/src/include/parser/parse_coerce.h
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+/*-------------------------------------------------------------------------
+ *
+ * parse_coerce.h
+ * Routines for type coercion.
+ *
+ *
+ * Portions Copyright (c) 1996-2022, 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 */