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MDEV-7950 Item_func::type() takes 0.26% in OLTP RO (Step#2) - Item_ref was doing unnecessary extra job after the "MDEV-7950 Step#2" patch. Fallback to Item::build_equal_items() if real_type() is not FIELD_ITEM. Note, Item_ref::build_equal_items() will most likely be further simplified. Waiting for Sanja and Igor to check a possibly dead code. - Safety: Adding Item_sum::build_equal_items() with ASSERT, as Item_sum should never appear in build_equal_items() context.
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Alexander Barkov
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Apr 29, 2015
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