Gagan Goel 01ff2652a6 MCOL-4023 Pushdown WHERE conditions for UPDATE/DELETE. ...

For certain queries, such as:
  update cs1 set i = 41 where i = 42 or (i is null and 42 is null);
the SELECT_LEX.where does not contain the required where conditions.
Server sends the where conditions in the call to cond_push(), so
we are storing them in a handler data member, condStack, and later
push them down to getSelectPlan() for UPDATES/DELETEs.

2020-06-01 11:03:42 -04:00

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