Marko Mäkelä 24fe53477c MDEV-29603 btr_cur_open_at_index_side() is missing some consistency checks ... btr_cur_t: Zero-initialize all fields in the default constructor. btr_cur_t::index: Remove; it duplicated page_cur.index. Many functions: Remove arguments that were duplicating page_cur_t::index and page_cur_t::block. page_cur_open_level(), btr_pcur_open_level(): Replaces btr_cur_open_at_index_side() for dict_stats_analyze_index(). At the end, release all latches except the dict_index_t::lock and the buf_page_t::lock on the requested page. dict_stats_analyze_index(): Rely on mtr_t::rollback_to_savepoint() to release all uninteresting page latches. btr_search_guess_on_hash(): Simplify the logic, and invoke mtr_t::rollback_to_savepoint(). We will use plain C++ std::vector<mtr_memo_slot_t> for mtr_t::m_memo. In this way, we can avoid setting mtr_memo_slot_t::object to nullptr and instead just remove garbage from m_memo. mtr_t::rollback_to_savepoint(): Shrink the vector. We will be needing this in dict_stats_analyze_index(), where we will release page latches and only retain the index->lock in mtr_t::m_memo. mtr_t::release_last_page(): Release the last acquired page latch. Replaces btr_leaf_page_release(). mtr_t::release(const buf_block_t&): Release a single page latch. Used in btr_pcur_move_backward_from_page(). mtr_t::memo_release(): Replaced with mtr_t::release(). mtr_t::upgrade_buffer_fix(): Acquire a latch for a buffer-fixed page. This replaces the double bookkeeping in btr_cur_t::open_leaf(). Reviewed by: Vladislav Lesin		2022-11-17 08:19:01 +02:00
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que0que.cc	MDEV-29603 btr_cur_open_at_index_side() is missing some consistency checks	2022-11-17 08:19:01 +02:00