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Instead of rechecking lossy index operators by putting them into the

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regular qpqual ('filter condition'), add special-purpose code to
nodeIndexscan.c to recheck them.  This ends being almost no net addition
of code, because the removal of planner code balances out the extra
executor code, but it is significantly more efficient when a lossy
operator is involved in an OR indexscan.  The old implementation had
to recheck the entire indexqual in such cases.
This commit is contained in:
Tom Lane
2004-01-06 04:31:01 +00:00
parent fa559a86ee
commit b0c4a50bbb
8 changed files with 134 additions and 114 deletions
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4
src/include/nodes/execnodes.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.109 2003/12/18 22:23:42 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.110 2004/01/06 04:31:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -776,6 +776,7 @@ typedef ScanState SeqScanState;
* RuntimeKeysReady true if runtime Skeys have been computed
* RelationDescs ptr to array of relation descriptors
* ScanDescs ptr to array of scan descriptors
* LossyQuals ptr to array of qual lists for lossy operators
* DupHash hashtable for recognizing dups in multiple scan
* MaxHash max # entries we will allow in hashtable
* ----------------
@ -795,6 +796,7 @@ typedef struct IndexScanState
bool iss_RuntimeKeysReady;
RelationPtr iss_RelationDescs;
IndexScanDescPtr iss_ScanDescs;
List **iss_LossyQuals;
HTAB *iss_DupHash;
long iss_MaxHash;
} IndexScanState;