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### What changes were proposed in this pull request? Support `date +/- year-month interval`. In the PR, I propose to re-use existing code from the `AddMonths` expression, and extract it to the common base class `AddMonthsBase`. That base class is used in new expression `DateAddYMInterval` and in the existing one `AddMonths` (the `add_months` function). ### Why are the changes needed? To conform the ANSI SQL standard which requires to support such operation over dates and intervals: <img width="811" alt="Screenshot 2021-03-12 at 11 36 14" src="https://user-images.githubusercontent.com/1580697/110914390-5f412480-8327-11eb-9f8b-e92e73c0b9cd.png"> ### Does this PR introduce _any_ user-facing change? Should not since new intervals have not been released yet. ### How was this patch tested? By running new tests: ``` $ build/sbt "test:testOnly *ColumnExpressionSuite" $ build/sbt "test:testOnly *DateExpressionsSuite" ``` Closes #31812 from MaxGekk/date-add-year-month-interval. Authored-by: Max Gekk <max.gekk@gmail.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> |
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