Roman Nozdrin 0c58f10d12 MCOL-2178 CS now sets optimizer flags like it did in the fork-era. ...

This happens in external_lock() whilst locking the table.

Fixes LIMIT=1 optimization for EXISTS_SUBS subqueries.

external_lock() contains if condition that gives false positive
for SH + pushed conditions.

external_lock() now resets in_subquery_conversion_threshold
variable that governs IN_INTO_SUBQUERY optimization for
queries run in table mode.

external_lock() now purges dynamicall allocated condInfo for
SH and DH execution path.

Commented out UNION check b/c if condition gives false positives
and silently enables table mode execution for queries w/o
UNION.

2019-09-15 07:12:50 -05:00

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