Igor Babaev cfa0506f8a MDEV-21554 Crash in JOIN_CACHE_BKAH::skip_index_tuple when mrr=on and ...

join_cache_level=6+

The patch fixes two similar bugs in the commit 8eeb689e9f
that added multi_range_read support to partitions. The commit opened
a possibility to join a partition table using BKA+MRR. However in some
cases it could lead to wrong results or even crashes.

This could happened when
- index condition pushdown was used to join the table or
- the joined table was an inner table of an outer join and 'not exist'
  optimization was applied or
- the join table was the inner table of a semi-join and the first match
  optimization was applied

The bugs were in the code of the call-back functions
- partition_multi_range_key_skip_record() and
- partition_multi_range_key_skip_index_tuple().
Each of this function consist only of an invocation of another function.
Yet a wrong parameter was passed at this invocation.

The fix was suggested by Sergey Petrunia and it is apparently in line
with original design.
The corresponding comprehensive test cases demonstrating the problems
caused by the bugs were constructed by me.

2020-02-25 00:50:23 -08:00

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