USING MECAB

PROBLEM

While running select with optimizer hint -> max_execution_time to return
the count of rows using the column that is primary key,the query doesn't
get interrupted after the max_execution_time is reached.
Optimizer does some optimization to fetch count of rows without actually
searchin of rows if the column in count expression can never be NULL .
Since there is no trx interruption check inside fts optimize query the
query isn't interrupted.

FIX

Add an interruption check in the long running fts_ast_visit function so
that query gets interrupted as expected.

Reviewed by: Jimmy Yang<Jimmy.Yang@oracle.com>
RB: 19490