MDEV-31255: Crash with fulltext search subquery in explain delete #4523
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ft_handler isn't getting initialized for subqueries inside explain delete/update queries. However, ft_handler is accessed inside ha_ft_read(), and is the reason for NULL pointer exception. However, that is not the case with non-explain queries. ft_handler initialization is done in the optimizer phase, that too selectively, when the flag SELECT_DESCRIBE is not set. In this PR, initialization of ft_handler is moved to the exexution phase, and is done always.
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ft_handler isn't getting initialized for subqueries inside explain delete/update queries. However, ft_handler is accessed inside ha_ft_read(), and is the reason for NULL pointer exception.
However, that is not the case with non-explain queries.
ft_handler initialization is done in the optimizer phase, that too selectively, when the flag SELECT_DESCRIBE is not set.
In this PR, initialization of ft_handler is moved to the exexution phase, and is done always.