Alexander Barkov aef530bb69
MDEV-15340 Wrong result HOUR(case_expression_with_time_and_datetime) ...
The problem was that Item_func_hybrid_field_type::get_date() did not
convert the result to the correct data type, so MYSQL_TIME::time_type
of the get_date() result could be not in sync with field_type().
Changes:
1. Adding two new classes Datetime and Date to store MYSQL_TIMESTAMP_DATETIME
and MYSQL_TIMESTAMP_DATE values respectively
(in addition to earlier added class Time, for MYSQL_TIMESTAMP_TIME values).
2. Adding Item_func_hybrid_field_type::time_op().
It performs the operation using TIME representation,
and always returns a MYSQL_TIME value with time_type=MYSQL_TIMESTAMP_TIME.
Implementing time_op() for all affected children classes.
3. Fixing all implementations of date_op() to perform the operation
using strictly DATETIME representation. Now they always return a MYSQL_TIME
value with time_type=MYSQL_TIMESTAMP_{DATE|DATETIME},
according to the result data type.
4. Removing assignment of ltime.time_type to mysql_timestamp_type()
from all val_xxx_from_date_op(), because now date_op() makes sure
to return a proper MYSQL_TIME value with a good time_type (and other member)
5. Adding Item_func_hybrid_field_type::val_xxx_from_time_op().
6. Overriding Type_handler_time_common::Item_func_hybrid_field_type_val_xxx()
to call val_xxx_from_time_op() instead of val_xxx_from_date_op().
7. Modified Item_func::get_arg0_date() to return strictly a TIME value
if TIME_TIME_ONLY is passed, or return strictly a DATETIME value otherwise.
If args[0] returned a value of a different temporal type,
(for example a TIME value when TIME_TIME_ONLY was not passed,
or a DATETIME value when TIME_TIME_ONLY was passed), the conversion
is automatically applied.
Earlier, get_arg0_date() did not guarantee a result in
accordance to TIME_TIME_ONLY flag.
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aef530bb69