Marko Mäkelä 41fe972db7 MDEV-21744 Assertion `!rec_offs_nth_sql_null(offsets, n)' failed ...

commit 08ba388713 of MDEV-12353
introduced an incorrect assumption, which was documented by
the failing assertion.

After instant ADD COLUMN, we can have a null (and in-place) UPDATE
of NULL to NULL. No data needs to be written for such updates.

For ROW_FORMAT=REDUNDANT, we reserve space for the NULL values,
and to be compatible with existing behaviour, we will zerofill
the unused data bytes when updating to NULL value.

2020-02-17 15:32:24 +02:00

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