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Fix range-query estimation to not double-exclude NULLs, per gripe from

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Ray Ontko 28-June-02.  Also, fix prefix_selectivity for NAME lefthand
variables (it was bogusly assuming binary compatibility), and adjust
make_greater_string() to not call pg_mbcliplen() with invalid multibyte
data (this last per bug report that I can't find at the moment, but it
was in July '02).
This commit is contained in:
Tom Lane
2002-10-19 02:56:16 +00:00
parent a3cb8746d9
commit c0f7dcdac1
3 changed files with 49 additions and 36 deletions
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8
src/include/utils/selfuncs.h
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: selfuncs.h,v 1.8 2002/09/04 20:31:46 momjian Exp $
* $Id: selfuncs.h,v 1.9 2002/10/19 02:56:16 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -66,8 +66,10 @@ extern Datum icregexnejoinsel(PG_FUNCTION_ARGS);
extern Datum nlikejoinsel(PG_FUNCTION_ARGS);
extern Datum icnlikejoinsel(PG_FUNCTION_ARGS);
extern Selectivity booltestsel(Query *root, BooleanTest *clause, int varRelid);
extern Selectivity nulltestsel(Query *root, NullTest *clause, int varRelid);
extern Selectivity booltestsel(Query *root, BoolTestType booltesttype,
Node *arg, int varRelid);
extern Selectivity nulltestsel(Query *root, NullTestType nulltesttype,
Node *arg, int varRelid);
extern void mergejoinscansel(Query *root, Node *clause,
Selectivity *leftscan,