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### What changes were proposed in this pull request? ``` <extract expression> ::= EXTRACT <left paren> <extract field> FROM <extract source> <right paren> <extract source> ::= <datetime value expression> | <interval value expression> ``` We now only support datetime values as extract source for `extract` expression but it's alternative function `date_part` supports both datetime and interval. This pr adds interval value support for `extract` expression as extract source ### Why are the changes needed? For ANSI compliance and the semantic consistency between extract and `date_part`, we support intervals for extract expressions. ### Does this PR introduce any user-facing change? yes, in the `extract(abc from xyz)` expression, the `xyz` can be intervals ### How was this patch tested? add unit tests Closes #27876 from yaooqinn/SPARK-31119. Authored-by: Kent Yao <yaooqinn@hotmail.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> |
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