database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-05 07:21:24 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

4
src/include/nodes/execnodes.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: execnodes.h,v 1.45 2000/08/06 04:26:29 tgl Exp $
* $Id: execnodes.h,v 1.46 2000/08/13 02:50:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -380,6 +380,7 @@ typedef struct CommonScanState
* NumScanKeys array of no of keys in each Skey struct
* RuntimeKeyInfo array of array of flags for Skeys evaled at runtime
* RuntimeContext expr context for evaling runtime Skeys
* RuntimeKeysReady true if runtime Skeys have been computed
* RelationDescs ptr to array of relation descriptors
* ScanDescs ptr to array of scan descriptors
* ----------------
@ -394,6 +395,7 @@ typedef struct IndexScanState
int *iss_NumScanKeys;
int **iss_RuntimeKeyInfo;
ExprContext *iss_RuntimeContext;
bool iss_RuntimeKeysReady;
RelationPtr iss_RelationDescs;
IndexScanDescPtr iss_ScanDescs;
HeapTupleData iss_htup;