Rewrite of planner statistics-gathering code. ANALYZE is now available as

a separate statement (though it can still be invoked as part of VACUUM, too).
pg_statistic redesigned to be more flexible about what statistics are
stored.  ANALYZE now collects a list of several of the most common values,
not just one, plus a histogram (not just the min and max values).  Random
sampling is used to make the process reasonably fast even on very large
tables.  The number of values and histogram bins collected is now
user-settable via an ALTER TABLE command.

There is more still to do; the new stats are not being used everywhere
they could be in the planner.  But the remaining changes for this project
should be localized, and the behavior is already better than before.

A not-very-related change is that sorting now makes use of btree comparison
routines if it can find one, rather than invoking '<' twice.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 9a071e7a250..4c0c1b03ef5 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.107 2001/03/22 03:59:32 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.108 2001/05/07 00:43:19 tgl Exp $
  *
  * NOTES
  *	  Most of the read functions for plan nodes are tested. (In fact, they
@@ -1874,11 +1874,11 @@ _readRestrictInfo(void)
 
 	/* eval_cost is not part of saved representation; compute on first use */
 	local_node->eval_cost = -1;
-	/* ditto for cached pathkeys and dispersion */
+	/* ditto for cached pathkeys and bucketsize */
 	local_node->left_pathkey = NIL;
 	local_node->right_pathkey = NIL;
-	local_node->left_dispersion = -1;
-	local_node->right_dispersion = -1;
+	local_node->left_bucketsize = -1;
+	local_node->right_bucketsize = -1;
 
 	return local_node;
 }