mirror of
https://git.postgresql.org/git/postgresql.git
synced 2026-02-08 08:47:31 +08:00
1ed6b89563
This feature has been a thorn in our sides for a long time, causing many grammatical ambiguity problems. It doesn't seem worth the pain to continue to support it, so remove it. There are some follow-on improvements we can make in the grammar, but this commit only removes the bare minimum number of productions, plus assorted backend support code. Note that pg_dump and psql continue to have full support, since they may be used against older servers. However, pg_dump warns about postfix operators. There is also a check in pg_upgrade. Documentation-wise, I (tgl) largely removed the "left unary" terminology in favor of saying "prefix operator", which is a more standard and IMO less confusing term. I included a catversion bump, although no initial catalog data changes here, to mark the boundary at which oprkind = 'r' stopped being valid in pg_operator. Mark Dilger, based on work by myself and Robert Haas; review by John Naylor Discussion: https://postgr.es/m/38ca86db-42ab-9b48-2902-337a0d6b8311@2ndquadrant.com
66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* parse_oper.h
|
|
* handle operator things for parser
|
|
*
|
|
*
|
|
* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
* src/include/parser/parse_oper.h
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#ifndef PARSE_OPER_H
|
|
#define PARSE_OPER_H
|
|
|
|
#include "access/htup.h"
|
|
#include "nodes/parsenodes.h"
|
|
#include "parser/parse_node.h"
|
|
|
|
|
|
typedef HeapTuple Operator;
|
|
|
|
/* Routines to look up an operator given name and exact input type(s) */
|
|
extern Oid LookupOperName(ParseState *pstate, List *opername,
|
|
Oid oprleft, Oid oprright,
|
|
bool noError, int location);
|
|
extern Oid LookupOperWithArgs(ObjectWithArgs *oper, bool noError);
|
|
|
|
/* Routines to find operators matching a name and given input types */
|
|
/* NB: the selected operator may require coercion of the input types! */
|
|
extern Operator oper(ParseState *pstate, List *op, Oid arg1, Oid arg2,
|
|
bool noError, int location);
|
|
extern Operator left_oper(ParseState *pstate, List *op, Oid arg,
|
|
bool noError, int location);
|
|
|
|
/* Routines to find operators that DO NOT require coercion --- ie, their */
|
|
/* input types are either exactly as given, or binary-compatible */
|
|
extern Operator compatible_oper(ParseState *pstate, List *op,
|
|
Oid arg1, Oid arg2,
|
|
bool noError, int location);
|
|
|
|
/* currently no need for compatible_left_oper/compatible_right_oper */
|
|
|
|
/* Routines for identifying "<", "=", ">" operators for a type */
|
|
extern void get_sort_group_operators(Oid argtype,
|
|
bool needLT, bool needEQ, bool needGT,
|
|
Oid *ltOpr, Oid *eqOpr, Oid *gtOpr,
|
|
bool *isHashable);
|
|
|
|
/* Convenience routines for common calls on the above */
|
|
extern Oid compatible_oper_opid(List *op, Oid arg1, Oid arg2, bool noError);
|
|
|
|
/* Extract operator OID or underlying-function OID from an Operator tuple */
|
|
extern Oid oprid(Operator op);
|
|
extern Oid oprfuncid(Operator op);
|
|
|
|
/* Build expression tree for an operator invocation */
|
|
extern Expr *make_op(ParseState *pstate, List *opname,
|
|
Node *ltree, Node *rtree, Node *last_srf, int location);
|
|
extern Expr *make_scalar_array_op(ParseState *pstate, List *opname,
|
|
bool useOr,
|
|
Node *ltree, Node *rtree, int location);
|
|
|
|
#endif /* PARSE_OPER_H */
|