Remove the flag vers_update_trt

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.

1 files changed, 12 insertions, 0 deletions

diff --git a/storage/innobase/include/row0upd.h b/storage/innobase/include/row0upd.h
index 1d10156b634..d375dcd9e70 100644
--- a/storage/innobase/include/row0upd.h
+++ b/storage/innobase/include/row0upd.h
@@ -484,6 +484,18 @@ struct upd_t{
 		return(false);
 	}
 
+	/** Determine if the update affects a system versioned column.
+	@param[in]	index	the clustered index that is being updated */
+	bool affects_versioned() const
+	{
+		for (ulint i = 0; i < n_fields; i++) {
+			if (fields[i].new_val.type.is_any_versioned()) {
+				return true;
+			}
+		}
+		return false;
+	}
+
 #ifdef UNIV_DEBUG
         bool validate() const
         {