[SPARK-18058][SQL][TRIVIAL] Use dataType.sameResult(...) instead equality on asNullable datatypes #16041
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What changes were proposed in this pull request?
This is absolutely minor. PR #15595 uses
dt1.asNullable == dt2.asNullableexpressions in a few places. It is however more efficient to calldt1.sameType(dt2). I have replaced every instance of the first pattern with the second pattern (3/5 were introduced by #15595).How was this patch tested?
Existing tests.