Varun Gupta ade8253cb9 MDEV-22303: Incorrect ordering with REGEXP_REPLACE and OFFSET/LIMIT ...

For character sets and collation where character to weight mapping > 1,
there we need to make sure while creating a sort key,
a temporary buffer is created to store the value of the item by val_str function
and then copy that value back to the sort buffer.
In this case when using a priority queue Sort_param::tmp_buffer was not allocated.

Minor refactoring:
Changed Sort_param::tmp_buffer from char* to String

2020-06-01 17:53:07 +05:30

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