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## What changes were proposed in this pull request? This patch implements xpath_boolean expression for Spark SQL, a xpath function that returns true or false. The implementation is modelled after Hive's xpath_boolean, except that how the expression handles null inputs. Hive throws a NullPointerException at runtime if either of the input is null. This implementation returns null if either of the input is null. ## How was this patch tested? Created two new test suites. One for unit tests covering the expression, and the other for end-to-end test in SQL. Author: petermaxlee <petermaxlee@gmail.com> Closes #13964 from petermaxlee/SPARK-16274. |
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