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authorTom Lane <tgl@sss.pgh.pa.us>1999-07-24 23:21:14 +0000
committerTom Lane <tgl@sss.pgh.pa.us>1999-07-24 23:21:14 +0000
commitac4913a0dd433ac1c2207014f886338f2ccd5fef (patch)
treed959e2082fcd500541ccdc9875b093b40c7d116a /src/backend/parser/parse_clause.c
parent348bdbce7942324dd19349d4d6f3f7dabae219c3 (diff)
downloadpostgresql-ac4913a0dd433ac1c2207014f886338f2ccd5fef.tar.gz
postgresql-ac4913a0dd433ac1c2207014f886338f2ccd5fef.zip
Clean up messy clause-selectivity code in clausesel.c; repair bug
identified by Hiroshi (incorrect cost attributed to OR clauses after multiple passes through set_rest_selec()). I think the code was trying to allow selectivities of OR subclauses to be passed in from outside, but noplace was actually passing any useful data, and set_rest_selec() was passing wrong data. Restructure representation of "indexqual" in IndexPath nodes so that it is the same as for indxqual in completed IndexScan nodes: namely, a toplevel list with an entry for each pass of the index scan, having sublists that are implicitly-ANDed index qual conditions for that pass. You don't want to know what the old representation was :-( Improve documentation of OR-clause indexscan functions. Remove useless 'notclause' field from RestrictInfo nodes. (This might force an initdb for anyone who has stored rules containing RestrictInfos, but I do not think that RestrictInfo ever appears in completed plans.)
Diffstat (limited to 'src/backend/parser/parse_clause.c')
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