Improved patch against latest CVS with more comments and new test
case attached. No regressions with make test.
> This updated patch greatly improves query times against compound
> SELECT statements (i.e., UNIONs) when the parent SELECT has a WHERE
> clause.
This updated patch greatly improves query times against compound
SELECT statements (i.e., UNIONs) when the parent SELECT has a WHERE
clause.
For example, this query:
SELECT * FROM (
SELECT a,b FROM t1
UNION ALL
SELECT x,y FROM t2
) WHERE a>b;
will be transformed into the more
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