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Fix a many-legged critter reported by chifungfan@yahoo.com: under the

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right circumstances a hash join executed as a DECLARE CURSOR/FETCH
query would crash the backend.  Problem as seen in current sources was
that the hash tables were stored in a context that was a child of
TransactionCommandContext, which got zapped at completion of the FETCH
command --- but cursor cleanup executed at COMMIT expected the tables
to still be valid.  I haven't chased down the details as seen in 7.0.*
but I'm sure it's the same general problem.
This commit is contained in:
Tom Lane
2000-08-22 04:06:22 +00:00
parent 94e90d9a86
commit 0147b1934f
7 changed files with 84 additions and 51 deletions
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11
src/include/nodes/execnodes.h
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@ -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 1.46 2000/08/13 02:50:24 tgl Exp $
* $Id: execnodes.h,v 1.47 2000/08/22 04:06:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -223,9 +223,14 @@ typedef struct EState
uint32 es_processed; /* # of tuples processed */
Oid es_lastoid; /* last oid processed (by INSERT) */
List *es_rowMark; /* not good place, but there is no other */
/* these two fields are storage space for ExecConstraints(): */
MemoryContext es_query_cxt; /* per-query context in which EState lives */
/* this ExprContext is for per-output-tuple operations, such as
* constraint checks and index-value computations. It can be reset
* for each output tuple. Note that it will be created only if needed.
*/
ExprContext *es_per_tuple_exprcontext;
/* this field is storage space for ExecConstraints(): */
List **es_result_relation_constraints;
ExprContext *es_constraint_exprcontext;
/* Below is to re-evaluate plan qual in READ COMMITTED mode */
struct Plan *es_origPlan;
Pointer es_evalPlanQual;