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MDEV-13358: FIRST_V throw SQL Fehler (1292): Incorrect datetime value
This is backport of 25ad623 for 10.2. The issue is similar to the one from MDEV-13240. Item::save_in_field() returns an error during tmp table population in a create table from select query as we try to save an empty string as a date value when force_return_blank is set to true for window functions. MDEV-13240 Wrong warning with MAX(datetime_field) OVER (...) The problem resided in Item_window_func implementation, and it was revealed by bb-10.2-ext specific changes: Item_window_func::save_in_field() works differently in bb-10.2-ext vs 10.2: - 10.2 goes through val_str() - bb-10.2-ext goes through get_date(), due to Type_handler related changes. get_date() tries to convert empty string to DATETIME, hence the warning. During a discussion with Vicentiu, it was decided to fix Item_window_func::val_xxx() to return NULL (instead of an "empty" value, such as 0 for numbers and '' for strings) when force_return_blank is set.
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