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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2009-03-26 17:15:35 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2009-03-26 17:15:35 +0000 |
| commit | f38fbf31f5719bb84b18042a7f415a4f20db2bfa (patch) | |
| tree | 9de323400560bd677e4402727b1f6bb3ec9834e9 /src/include/nodes/relation.h | |
| parent | ee4c187f6471af5f71fd5dd12021fa8d7c4fce11 (diff) | |
| download | postgresql-f38fbf31f5719bb84b18042a7f415a4f20db2bfa.tar.gz postgresql-f38fbf31f5719bb84b18042a7f415a4f20db2bfa.zip | |
If we expect a hash join to be performed in multiple batches, suppress
"physical tlist" optimization on the outer relation (ie, force a projection
step to occur in its scan). This avoids storing useless column values when
the outer relation's tuples are written to temporary batch files.
Modified version of a patch by Michael Henderson and Ramon Lawrence.
Diffstat (limited to 'src/include/nodes/relation.h')
| -rw-r--r-- | src/include/nodes/relation.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h index 4f1bc4067d2..cf567b99746 100644 --- a/src/include/nodes/relation.h +++ b/src/include/nodes/relation.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.170 2009/03/05 23:06:45 tgl Exp $ + * $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.171 2009/03/26 17:15:35 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -845,6 +845,7 @@ typedef struct HashPath { JoinPath jpath; List *path_hashclauses; /* join clauses used for hashing */ + int num_batches; /* number of batches expected */ } HashPath; /* |