Hi all,
I am using version 8.2.4 of the source and compiled it with
both OPTIMIZER_DEBUG and EXEC_EVALDEBUG enabled to take a look
at how quals are evaluated by the executor.
However, when I issue a query like
SELECT name FROM city WHERE population < 100000 LIMIT 10;
I get the following debug output from postgres:
After canonicalize_qual() {OPEXPR :opno 97 :opfuncid 66 :opresulttype 16 :opretset false :args ( {VAR
:varno 1 :varattno 4 :vartype 23 :vartypmod -1 :varlevelsup 0 :varnoold 1 :varoattno 4
} {CONST :consttype 23 :constlen 4 :constbyval true :constisnull false :constvalue 4 [
-96-122 1 0 ] } ) }
RELOPTINFO (1): rows=1018 width=88 baserestrictinfo: city.population < 100000 path list: SeqScan(1)
rows=1018cost=0.00..66.16
cheapest startup path: SeqScan(1) rows=1018 cost=0.00..66.16
cheapest total path: SeqScan(1) rows=1018 cost=0.00..66.16
WARNING: could not dump unrecognized node type: 404
ExecQual: qual is ( { }
)
WARNING: could not dump unrecognized node type: 404
ExecQual: qual is ( { }
)
... and many more of this WARNINGs.
What happens to the OpExpr on its way from canonicalize_qual() to ExecQual() that makes _outNode() stumble over it when
itis encounteredin ExecQual()?
Regards,
Peter
