database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-14 18:42:34 +03:00
Code Activity

Fix problems with cached tuple descriptors disappearing while still in use

Browse Source 
by creating a reference-count mechanism, similar to what we did a long time
ago for catcache entries.  The back branches have an ugly solution involving
lots of extra copies, but this way is more efficient.  Reference counting is
only applied to tupdescs that are actually in caches --- there seems no need
to use it for tupdescs that are generated in the executor, since they'll go
away during plan shutdown by virtue of being in the per-query memory context.
Neil Conway and Tom Lane
This commit is contained in:
Tom Lane
2006-06-16 18:42:24 +00:00
parent b49ce32da1
commit 06e10abc0b
36 changed files with 581 additions and 246 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
src/backend/executor/nodeSubqueryscan.c
View File

@ -12,7 +12,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/nodeSubqueryscan.c,v 1.29 2006/03/05 15:58:26 momjian Exp $
* $PostgreSQL: pgsql/src/backend/executor/nodeSubqueryscan.c,v 1.30 2006/06/16 18:42:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -202,11 +202,13 @@ ExecInitSubqueryScan(SubqueryScan *node, EState *estate, int eflags)
subquerystate->ss.ps.ps_TupFromTlist = false;
/*
* Initialize scan tuple type (needed by ExecAssignScanProjectionInfo)
* Initialize scan tuple type (needed by ExecAssignScanProjectionInfo).
* Because the subplan is in its own memory context, we need to copy its
* result tuple type not just link to it; else the tupdesc will disappear
* too soon during shutdown.
*/
ExecAssignScanType(&subquerystate->ss,
ExecGetResultType(subquerystate->subplan),
false);
CreateTupleDescCopy(ExecGetResultType(subquerystate->subplan)));
/*
* Initialize result tuple type and projection info.