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btree. We can't easily tell whether clauses generated from the equivalence class could be used with such an index, so just assume that they might be. This bit of over-optimization prevented use of non-btree indexes for nestloop inner indexscans, in any case where the join uses an equality operator that is also a btree operator --- which in particular is typically true for hash indexes. Noted while trying to test the current hash index patch. |
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