Alexander Barkov e0df116056 A clean-up after the patch for MDEV-8747 and MDEV-8749: ...

removing IMPOSSIBLE_RESULT from Item_result, as it's not
needed any more. The fact that an Item is not in a comparison
context is now always designated by IDENTITY_SUBST in Subst_constraint.
Previously IMPOSSIBLE_RESULT and IDENTITY_SUBST co-existed but
actually meant the same thing.

2015-09-06 13:25:47 +04:00

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