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[SPARK-16436][SQL] checkEvaluation should support NaN
## What changes were proposed in this pull request? This small patch modifies ExpressionEvalHelper. checkEvaluation to support comparing NaN values for floating point comparisons. ## How was this patch tested? This is a test harness change. Author: petermaxlee <petermaxlee@gmail.com> Closes #14103 from petermaxlee/SPARK-16436.
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