Sergei Petrunia af4b2ae858 MDEV-21887: federatedx crashes on SELECT ... INTO query in select_handler code ...

Backport to 10.4:

- Don't try to push down SELECTs that have a side effect

- In case the storage engine did support pushdown of SELECT with an INTO
  clause, write the rows we've got from it into select->join->result,
  and not thd->protocol.  This way, SELECT ... INTO ... FROM
  smart_engine_table will put the result into where instructed, and
  NOT send it to the client.

2020-03-26 15:01:44 +03:00

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