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Augment EXPLAIN output with more details on Hash nodes.

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We show the number of buckets, the number of batches (and also the original
number if it has changed), and the peak space used by the hash table.  Minor
executor changes to track peak space used.
This commit is contained in:
Robert Haas
2010-02-01 15:43:36 +00:00
parent cccfc4efc4
commit 42a8ab0a14
3 changed files with 59 additions and 3 deletions
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3
src/include/executor/hashjoin.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/executor/hashjoin.h,v 1.52 2010/01/02 16:58:03 momjian Exp $
* $PostgreSQL: pgsql/src/include/executor/hashjoin.h,v 1.53 2010/02/01 15:43:36 rhaas Exp $
*
*-------------------------------------------------------------------------
*/
@@ -149,6 +149,7 @@ typedef struct HashJoinTableData
Size spaceUsed; /* memory space currently used by tuples */
Size spaceAllowed; /* upper limit for space used */
Size spacePeak; /* peak space used */
Size spaceUsedSkew; /* skew hash table's current space usage */
Size spaceAllowedSkew; /* upper limit for skew hashtable */