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MDEV-7122: Assertion `0' failed in subselect_hash_sj_engine::init
The select mentioned in the bug attempted to create a temporary table using the maria storage engine. The table needs to have primary keys such that duplicates can be removed. Unfortunately this use case has a longer than allowed key and the tmp table got created without a temporary key. We must not allow materialization for the subquery if the total key length and key parts is greater than what the storage engine supports.
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