beliefer opened a new pull request #25074: [SPARK-27924][SQL] Support ANSI SQL Boolean-Predicate syntax URL: https://github.com/apache/spark/pull/25074 ## What changes were proposed in this pull request? This PR aims to support ANSI SQL `Boolean-Predicate` syntax. ```sql expression IS [NOT] TRUE expression IS [NOT] FALSE expression IS [NOT] UNKNOWN ``` There are some mainstream database support this syntax. - **PostgreSQL:** https://www.postgresql.org/docs/9.1/functions-comparison.html - **Hive:** https://issues.apache.org/jira/browse/HIVE-13583 - **Redshift:** https://docs.aws.amazon.com/redshift/latest/dg/r_Boolean_type.html - **Vertica:** https://www.vertica.com/docs/9.2.x/HTML/Content/Authoring/SQLReferenceManual/LanguageElements/Predicates/Boolean-predicate.htm For example: ```sql spark-sql> select null is true; false spark-sql> select null is not true; true spark-sql> select false is true; false spark-sql> select false is not true; true spark-sql> select true is true; true spark-sql> select true is not true; false spark-sql> select null is false; false spark-sql> select null is not false; true spark-sql> select false is false; true spark-sql> select false is not false; false spark-sql> select true is false; false spark-sql> select true is not false; true spark-sql> select null is unknown; true spark-sql> select null is not unknown; false spark-sql> select false is unknown; false spark-sql> select false is not unknown; true spark-sql> select true is unknown; false spark-sql> select true is not unknown; true ``` **Note**: A null input is treated as the logical value "unknown". ## How was this patch tested? Pass the Jenkins with the newly added test cases.
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