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When creating a cast that uses a conversion function, we've historically allowed the input and result types to be binary-compatible with the function's input and result types, rather than necessarily being identical. This means that the new cast is logically dependent on the binary-compatible cast or casts that it references: if those are defined by pg_cast entries, and you try to restore the new cast without having defined them, it'll fail. Hence, we should make pg_depend entries to record these dependencies so that pg_dump knows that there is an ordering requirement. This is not the only place where we allow such shortcuts; aggregate functions for example are similarly lax, and in principle should gain similar dependencies. However, for now it seems sufficient to fix the cast-versus-cast case, as pg_dump's other ordering heuristics should keep it out of trouble for other object types. Per report from David Turoň; thanks also to Robert Haas for preliminary investigation. I considered back-patching, but seeing that this issue has existed for many years without previous reports, it's not clear it's worth the trouble. Moreover, back-patching wouldn't be enough to ensure that the new pg_depend entries exist in existing databases anyway. Discussion: https://postgr.es/m/OF0A160F3E.578B15D1-ONC12588DA.003E4857-C12588DA.0045A428@notes.linuxbox.cz
102 lines
3.7 KiB
C
102 lines
3.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* parse_coerce.h
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* Routines for type coercion.
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*
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*
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* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/parser/parse_coerce.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PARSE_COERCE_H
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#define PARSE_COERCE_H
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#include "parser/parse_node.h"
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/* Type categories (see TYPCATEGORY_xxx symbols in catalog/pg_type.h) */
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typedef char TYPCATEGORY;
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/* Result codes for find_coercion_pathway */
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typedef enum CoercionPathType
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{
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COERCION_PATH_NONE, /* failed to find any coercion pathway */
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COERCION_PATH_FUNC, /* apply the specified coercion function */
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COERCION_PATH_RELABELTYPE, /* binary-compatible cast, no function */
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COERCION_PATH_ARRAYCOERCE, /* need an ArrayCoerceExpr node */
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COERCION_PATH_COERCEVIAIO /* need a CoerceViaIO node */
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} CoercionPathType;
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extern bool IsBinaryCoercible(Oid srctype, Oid targettype);
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extern bool IsBinaryCoercibleWithCast(Oid srctype, Oid targettype,
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Oid *castoid);
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extern bool IsPreferredType(TYPCATEGORY category, Oid type);
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extern TYPCATEGORY TypeCategory(Oid type);
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extern Node *coerce_to_target_type(ParseState *pstate,
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Node *expr, Oid exprtype,
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Oid targettype, int32 targettypmod,
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CoercionContext ccontext,
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CoercionForm cformat,
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int location);
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extern bool can_coerce_type(int nargs, const Oid *input_typeids, const Oid *target_typeids,
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CoercionContext ccontext);
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extern Node *coerce_type(ParseState *pstate, Node *node,
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Oid inputTypeId, Oid targetTypeId, int32 targetTypeMod,
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CoercionContext ccontext, CoercionForm cformat, int location);
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extern Node *coerce_to_domain(Node *arg, Oid baseTypeId, int32 baseTypeMod,
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Oid typeId,
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CoercionContext ccontext, CoercionForm cformat, int location,
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bool hideInputCoercion);
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extern Node *coerce_to_boolean(ParseState *pstate, Node *node,
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const char *constructName);
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extern Node *coerce_to_specific_type(ParseState *pstate, Node *node,
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Oid targetTypeId,
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const char *constructName);
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extern Node *coerce_to_specific_type_typmod(ParseState *pstate, Node *node,
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Oid targetTypeId, int32 targetTypmod,
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const char *constructName);
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extern int parser_coercion_errposition(ParseState *pstate,
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int coerce_location,
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Node *input_expr);
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extern Oid select_common_type(ParseState *pstate, List *exprs,
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const char *context, Node **which_expr);
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extern Node *coerce_to_common_type(ParseState *pstate, Node *node,
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Oid targetTypeId,
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const char *context);
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extern bool verify_common_type(Oid common_type, List *exprs);
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extern int32 select_common_typmod(ParseState *pstate, List *exprs, Oid common_type);
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extern bool check_generic_type_consistency(const Oid *actual_arg_types,
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const Oid *declared_arg_types,
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int nargs);
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extern Oid enforce_generic_type_consistency(const Oid *actual_arg_types,
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Oid *declared_arg_types,
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int nargs,
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Oid rettype,
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bool allow_poly);
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extern char *check_valid_polymorphic_signature(Oid ret_type,
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const Oid *declared_arg_types,
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int nargs);
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extern char *check_valid_internal_signature(Oid ret_type,
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const Oid *declared_arg_types,
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int nargs);
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extern CoercionPathType find_coercion_pathway(Oid targetTypeId,
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Oid sourceTypeId,
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CoercionContext ccontext,
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Oid *funcid);
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extern CoercionPathType find_typmod_coercion_function(Oid typeId,
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Oid *funcid);
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#endif /* PARSE_COERCE_H */
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