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Clean up handling of variable-free qual clauses. System now does the

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right thing with variable-free clauses that contain noncachable functions,
such as 'WHERE random() < 0.5' --- these are evaluated once per
potential output tuple.  Expressions that contain only Params are
now candidates to be indexscan quals --- for example, 'var = ($1 + 1)'
can now be indexed.  Cope with RelabelType nodes atop potential indexscan
variables --- this oversight prevents 7.0.* from recognizing some
potentially indexscanable situations.
This commit is contained in:
Tom Lane
2000-08-13 02:50:35 +00:00
parent 766fb7f707
commit 37168b8da4
15 changed files with 410 additions and 177 deletions
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25
src/include/utils/lsyscache.h
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: lsyscache.h,v 1.24 2000/06/08 22:37:58 momjian Exp $
* $Id: lsyscache.h,v 1.25 2000/08/13 02:50:31 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -15,7 +15,7 @@
#include "access/htup.h"
extern bool op_class(Oid opid, Oid opclass, Oid amopid);
extern bool op_class(Oid opno, Oid opclass, Oid amopid);
extern char *get_attname(Oid relid, AttrNumber attnum);
extern AttrNumber get_attnum(Oid relid, char *attname);
extern Oid get_atttype(Oid relid, AttrNumber attnum);
@ -23,21 +23,20 @@ extern bool get_attisset(Oid relid, char *attname);
extern int32 get_atttypmod(Oid relid, AttrNumber attnum);
extern double get_attdisbursion(Oid relid, AttrNumber attnum,
double min_estimate);
extern RegProcedure get_opcode(Oid opid);
extern char *get_opname(Oid opid);
extern bool op_mergejoinable(Oid opid, Oid ltype, Oid rtype,
extern RegProcedure get_opcode(Oid opno);
extern char *get_opname(Oid opno);
extern bool op_mergejoinable(Oid opno, Oid ltype, Oid rtype,
Oid *leftOp, Oid *rightOp);
extern Oid op_hashjoinable(Oid opid, Oid ltype, Oid rtype);
extern Oid get_commutator(Oid opid);
extern Oid op_hashjoinable(Oid opno, Oid ltype, Oid rtype);
extern bool op_iscachable(Oid opno);
extern HeapTuple get_operator_tuple(Oid opno);
extern Oid get_negator(Oid opid);
extern RegProcedure get_oprrest(Oid opid);
extern RegProcedure get_oprjoin(Oid opid);
extern Oid get_commutator(Oid opno);
extern Oid get_negator(Oid opno);
extern RegProcedure get_oprrest(Oid opno);
extern RegProcedure get_oprjoin(Oid opno);
extern Oid get_func_rettype(Oid funcid);
extern bool func_iscachable(Oid funcid);
extern char *get_rel_name(Oid relid);
extern struct varlena *get_relstub(Oid relid, int no, bool *islast);
extern Oid get_ruleid(char *rulename);
extern Oid get_eventrelid(Oid ruleid);
extern int16 get_typlen(Oid typid);
extern bool get_typbyval(Oid typid);
extern Datum get_typdefault(Oid typid);