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This bug was originally repeated on 10.4 after defining a UNIQUE KEY on a TEXT column, which is implemented by MDEV-371 by creating the index on a hidden virtual column. While row_vers_vc_matches_cluster() is executing in a purge thread to find out if an index entry may be removed in a secondary index that comprises a virtual column, another purge thread may process the undo log record that this check is interested in, and write a null BLOB pointer in that record. This would trip the assertion. To prevent this from occurring, we must propagate the 'missing BLOB' error up the call stack. row_upd_ext_fetch(): Return NULL when the error occurs. row_upd_index_replace_new_col_val(): Return whether the previous version was built successfully. row_upd_index_replace_new_col_vals_index_pos(): Check the error result. Yes, we would intentionally crash on this error if it occurs outside the purge thread. row_upd_index_replace_new_col_vals(): Check for the error condition, and simplify the logic. trx_undo_prev_version_build(): Check for the error condition. |
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