wangyum opened a new pull request #24850: [WIP][SPARK-28020][SQL][TEST] Port date.sql URL: https://github.com/apache/spark/pull/24850 ## What changes were proposed in this pull request? This PR is to port date.sql from PostgreSQL regression tests. https://github.com/postgres/postgres/blob/REL_12_BETA1/src/test/regress/sql/date.sql The expected results can be found in the link: https://github.com/postgres/postgres/blob/REL_12_BETA1/src/test/regress/expected/date.out When porting the test cases, found two PostgreSQL specific features that do not exist in Spark SQL: [SPARK-27898](https://issues.apache.org/jira/browse/SPARK-27898): Support 4 date operators(date + integer, integer + date, date - integer and date - date) [SPARK-28017](https://issues.apache.org/jira/browse/SPARK-28017): Enhance EXTRACT/DATE_TRUNC Also, found a bug: [SPARK-28015](https://issues.apache.org/jira/browse/SPARK-28015): Invalid date formats should throw an exception Also, found a inconsistent behavior: [SPARK-27923](https://issues.apache.org/jira/browse/SPARK-27923): Invalid date throw an exception bug Spark SQL returns `NULL`, for example: https://github.com/postgres/postgres/blob/30bcebbdcf23eb8b78e553c4b3b5eb847410ef19/src/test/regress/expected/date.out#L13-L14 ## How was this patch tested? N/A
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