Oleksandr Byelkin 195dcfec6f MDEV-35793: Server crashes in Item_func_vec_distance_common::get_const_arg ...

The problem was caused by this scenario: The query had both SELECT DISTINCT
and ORDER BY. DISTINCT was converted into GROUP BY. Then, vector index was
used to resolve the GROUP BY.
When join_read_first() initialized vector index scan, it used the ORDER BY
clause instead of GROUP BY, which caused a crash.

Fixed by making test_if_skip_sort_order() remember which ordering the scan
produces in JOIN_TAB::full_index_scan_order, and join_read_first() using that.

2025-01-21 12:54:43 +01:00

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