PROBLEM

When using Index merge optimization current partitioning code in 5.6
does a memcpy instead of column of copy of the columns on which index
read is done . Because of which wrong record gets copied and optimizer
thinks there is no matching record as per the search criteria returning
0 for the count(*) value . The problem is sporiadic as the plan is not
always using intersection .

SOLUTION

Added a similar column copy function that would do the copy of required
column and not overwrite the other as in 5.7.

Reviewed-by: Debarun <Banerjee&lt;debarun.banerjee@oracle.com>
RB: 16157