Alexander Barkov e0b6294338 MDEV-20855 Crash with PARTITION BY LIST and extended characters ...

The code in convert_charset_partition_constant() did not
take into account that the call for item->safe_charset_converter()
can return NULL when conversion is not safe.

Note, 10.2 was not affected. The test for NULL presents in 10.2,
but it disappeared in 10.3 in a mistake. Restoring the test.

2019-10-18 10:24:53 +04:00

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