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### What changes were proposed in this pull request? Support `timestamp +/- year-month interval`. In the PR, I propose to introduce new binary expression `TimestampAddYMInterval` similarly to `DateAddYMInterval`. It invokes new method `timestampAddMonths` from `DateTimeUtils` by passing a timestamp as an offset in microseconds since the epoch, amount of months from the giveb year-month interval, and the time zone ID in which the operation is performed. The `timestampAddMonths()` method converts the input microseconds to a local timestamp, adds months to it, and converts the results back to an instant in microseconds at the given time zone. ### Why are the changes needed? To conform the ANSI SQL standard which requires to support such operation over timestamps and intervals: <img width="811" alt="Screenshot 2021-03-12 at 11 36 14" src="https://user-images.githubusercontent.com/1580697/111081674-865d4900-8515-11eb-86c8-3538ecaf4804.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 *DateTimeUtilsSuite" $ build/sbt "test:testOnly *DateExpressionsSuite" $ build/sbt "test:testOnly *ColumnExpressionSuite" ``` Closes #31832 from MaxGekk/timestamp-add-year-month-interval. Authored-by: Max Gekk <max.gekk@gmail.com> Signed-off-by: Max Gekk <max.gekk@gmail.com> |
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