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After a failed ADD INDEX, dict_index_remove_from_cache_low() could iterate the index fields and dereference a freed virtual column object when trying to remove the index from the v_indexes of the virtual column. This regression was caused by a merge of MDEV-16119 InnoDB lock->index refers to a freed object. ha_innobase_inplace_ctx::clear_added_indexes(): Detach the indexes of uncommitted indexes from virtual columns, so that the iteration in dict_index_remove_from_cache_low() can be avoided. ha_innobase::prepare_inplace_alter_table(): Ignore uncommitted corrupted indexes when rejecting ALTER TABLE. (This minor bug was revealed by the extension of the test case.) dict_index_t::detach_columns(): Detach an index from virtual columns. Invoked by both dict_index_remove_from_cache_low() and ha_innobase_inplace_ctx::clear_added_indexes(). dict_col_t::detach(const dict_index_t& index): Detach an index from a column. dict_col_t::is_virtual(): Replaces dict_col_is_virtual(). dict_index_t::has_virtual(): Replaces dict_index_has_virtual(). |
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