MDEV-15243 Crash with virtual fields and row based binary logging
The cause of this was several different bugs: - When using binary logging with binlog_row_image=FULL the all bits in read_set was set, which caused a different (wrong) pattern for marking vcol_set. - TABLE::mark_virtual_columns_for_write() didn't in all cases mark vcol_set with the vcol_field. - TABLE::update_virtual_fields() has to update all vcol fields on REPLACE if binary logging with FULL is used. - VCOL_UPDATE_INDEXED should update all vcol fields part of an index that was not updated by VCOL_UPDATE_FOR_READ - max_row_length() calculated length of NULL and not used fields. This didn't cause any crash, but used more memory than needed.
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