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MDEV-20261 NULL passed to String::eq, SEGV, server crash, regression …
…in 10.4 Type_handler_xxx::Item_const_eq() can handle only non-NULL values. The code in Item_basic_value::eq() did not take this into account. Adding a test to detect three different combinations: - Both values are NULLs, return true. - Only one value is NULL, return false. - Both values are not NULL, call Type_handler::Item_const_eq() to check equality.
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