wangyum opened a new pull request #25241: [SPARK-28424][SQL] Support typed interval expression URL: https://github.com/apache/spark/pull/25241 ## What changes were proposed in this pull request? This PR add support typed `interval` expression: ```sql spark-sql> select interval 'interval 3 year 1 hour'; interval 3 years 1 hours spark-sql> ``` Please note that this pr did not add a cast alias for `interval` type like [other types](https://github.com/apache/spark/blob/2d74f14d74e7b24109f347822600ebf9819b04c1/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala#L529-L541) because neither PostgreSQL nor Hive supports this syntax. ## How was this patch tested? unit tests
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