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and on update read all keys that changes
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#define HA_REQUIRES_KEY_COLUMNS_FOR_DELETE (1 << 6)
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#define HA_REQUIRE_PRIMARY_KEY (1 << 12) /* .. and can't create a hidden one */
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#define HA_NOT_DELETE_WITH_CACHE (1 << 18)
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The following is we need to a primary key to delete (and update) a row.
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If there is no primary key, all columns needs to be read on update and delete