Sergei Petrunia 21e79331c8 MDEV-22779: Crash: Prepared Statement with a '?' parameter inside a re-used CTE ...

When a prepared statement parameter '?' is used in a CTE that is used
multiple times, the following happens:
- The CTE definition is re-parsed multiple times.
- There are multiple Item_param objects referring to the same "?" in
the original query.
- Prepared_statement::param has a pointer to the first of them, the
  others are "clones".
- When prepared statement parameter gets the value, it should be passed
  over to clones with param->sync_clones() call.

This call is made in insert_params(), etc. It was not made in
insert_params_with_log().

This would cause Item_param to not have any value which would confuse
the query optimizer.

Added the missing call.

2020-06-14 10:40:56 +03:00

874 KiB

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