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Change THD->transaction to a pointer to enable multiple transactions

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All changes (except one) is of type
thd->transaction.  -> thd->transaction->

thd->transaction points by default to 'thd->default_transaction'
This allows us to 'easily' have multiple active transactions for a
THD object, like when reading data from the mysql.proc table
This commit is contained in:
Monty
2020-05-04 14:20:14 +03:00
parent 7ae812cf2c
commit d1d472646d
32 changed files with 317 additions and 311 deletions
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4
sql/sql_sequence.cc
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@ -437,7 +437,7 @@ int SEQUENCE::read_initial_values(TABLE *table)
MYSQL_LOCK *lock;
bool mdl_lock_used= 0;
THD *thd= table->in_use;
bool has_active_transaction= !thd->transaction.stmt.is_empty();
bool has_active_transaction= !thd->transaction->stmt.is_empty();
/*
There is already a mdl_ticket for this table. However, for list_fields
the MDL lock is of type MDL_SHARED_HIGH_PRIO which is not usable
@ -490,7 +490,7 @@ int SEQUENCE::read_initial_values(TABLE *table)
But we also don't want to commit the stmt transaction while in a
substatement, see MDEV-15977.
*/
if (!has_active_transaction && !thd->transaction.stmt.is_empty() &&
if (!has_active_transaction && !thd->transaction->stmt.is_empty() &&
!thd->in_sub_stmt)
trans_commit_stmt(thd);
}