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MDEV-23537 Comparison with temporal columns is slow in MariaDB

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Implementing methods:
- Field::val_time_packed()
- Field::val_datetime_packed()
- Item_field::val_datetime_packed(THD *thd);
- Item_field::val_time_packed(THD *thd);
to give a faster access to temporal packed longlong representation of a Field,
which is used in temporal Arg_comparator's to DATE, TIME, DATETIME data types.

The same idea is used in MySQL-5.6+.

This improves performance.
This commit is contained in:
Alexander Barkov
2020-08-22 15:22:20 +04:00
parent ae33ebe5b3
commit 2e5d86f49e
5 changed files with 88 additions and 0 deletions
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7
sql/sql_type.h
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@ -1542,6 +1542,13 @@ public:
Time(int *warn, bool neg, ulonglong hour, uint minute, const Sec6 &second);
Time() { time_type= MYSQL_TIMESTAMP_NONE; }
Time(const Native &native);
Time(THD *thd, const MYSQL_TIME *ltime, const Options opt)
{
*(static_cast<MYSQL_TIME*>(this))= *ltime;
DBUG_ASSERT(is_valid_temporal());
int warn= 0;
valid_MYSQL_TIME_to_valid_value(thd, &warn, opt);
}
Time(Item *item)
:Time(current_thd, item)
{ }