Varun Gupta db56f9b852 MDEV-24015: SQL Error (1038): Out of sort memory when enough memory for the sort buffer is provided ...

For a correlated subquery filesort is executed multiple times.
During each execution, sortlength() computed total sort key length in
Sort_keys::sort_length, without resetting it first.

Eventually Sort_keys::sort_length got larger than @@sort_buffer_size, which
caused filesort() to be aborted with error.

Fixed by making sortlength() to compute lengths only during the first
invocation. Subsequent invocations return pre-computed values.

2020-10-28 10:53:22 +05:30

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