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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Bram Kivenko
Your email address : bram@xspace.com
Category : runtime: back-end: SQL
Severity : non-critical
Summary: ERROR: RestrictionClauseSelectivity: bad value 2.213087
System Configuration
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Operating System : LINUX 2.0.36
PostgreSQL version : 6.4.2
Compiler used : GCC 2.8.1
Hardware:
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Linux mulder 2.0.36 #4 Wed Nov 18 10:49:57 EST 1998 i586
11:11pm up 5 days, 15:24, 11 users, load average: 0.33, 0.26, 0.33
115 processes: 114 sleeping, 1 running, 0 zombie, 0 stopped
CPU states: 0.5% user, 3.2% system, 3.6% nice, 96.3% idle
Mem: 62312K av, 59564K used, 2748K free, 58320K shrd, 3744K buff
Swap: 92728K av, 176K used, 92552K free 20148K cached
Versions of other tools:
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Gnu make - 3.74
Flex - 2.5.4
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Problem Description:
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All but some spurious select queries with comparisons against
text fields return a RestrictionClauseSelectivity error.
src/backend/optimizer/util/plancat.c:
I modified the function "restriction_selectivity"
to accept values from 0.0 - 3.0, instead 0.0 to 1.0...
This gets rid of the error message, but it probably doesn't
make for a good engine.
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Test Case:
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The query:
SELECT "xx_entryid" FROM "uui_extras" WHERE "News Type" LIKE 'releases';
Fails on the table:
CREATE TABLE "uui_extras" (
"xx_entryid" int4,
"Division" text,
"list in directory" int2,
"File Types" text,
"News Type" text);
The table is currently populated with:
INSERT INTO "uui_extras" values (1000,'Corporate+Office',1,'Documentation','releases');
INSERT INTO "uui_extras" values (1002,'Solutions+-+EMEA',NULL,'Information','reports%3Aquarterly+reports');
INSERT INTO "uui_extras" values (1001,'Card+Services+-+US',NULL,'Upgrade','reports%3Aannual+reports');
INSERT INTO "uui_extras" values (1003,'Card+Services+-+Canada',NULL,'Miscellaneous','highlights');
INSERT INTO "uui_extras" values (1004,NULL,NULL,'FAQ','disclosure');
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Solution:
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