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unknown authored
Analysis: Range analysis detects that the subquery is expensive and doesn't build a range access method. Later, the applicability test for loose scan doesn't take that into account, and builds a loose scan method without a range scan on the min/max column. As a result loose scan fetches the first key in each group, rather than the first key that satisfies the condition on the min/max column. Solution: Since there is no SEL_ARG tree to be used for the min/max column, it is not possible to use loose scan if the min/max column is compared with an expensive scalar subquery. Make the test for loose scan applicability to be in sync with the range analysis code by testing if the min/max argument is compared with an expensive predicate.
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