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THD::vers_update_trt, trx_t::vers_update_trt, trx_savept_t::vers_update_trt: Remove. Instead, determine from trx_t::mod_tables whether versioned columns were affected by the transaction. handlerton::prepare_commit_versioned: Replaces vers_get_trt_data. Return the transaction start ID and also the commit ID, in case the transaction modified any system-versioned columns (0 if not). TR_table::store_data(): Remove (merge with update() below). TR_table::update(): Add the parameters start_id, end_id. ha_commit_trans(): Remove a condition on SQLCOM_ALTER_TABLE. If we need something special for ALTER TABLE...ALGORITHM=INPLACE, that can be done inside InnoDB by modifying trx_t::mod_tables. innodb_prepare_commit_versioned(): Renamed from innodb_get_trt_data(). Check trx_t::mod_tables to see if any changes to versioned columns are present. trx_mod_table_time_t: A pair of logical timestamps, replacing the undo_no_t in trx_mod_tables_t. Keep track of not only the first modification to a persistent table in each transaction, but also the first modification of a versioned column in a table. dtype_t, dict_col_t: Add the accessor is_any_versioned(), to check if the type refers to a system-versioned user or system column. upd_t::affects_versioned(): Check if an update affects a versioned column. trx_undo_report_row_operation(): If a versioned column is affected by the update, invoke trx_mod_table_time_t::set_versioned(). trx_rollback_to_savepoint_low(): If all changes to versioned columns were rolled back, invoke trx_mod_table_time_t::rollback_versioned(), so that trx_mod_table_time_t::is_versioned() will no longer hold.
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