beec8d535f
### What changes were proposed in this pull request? The implementation of TimeSub for the operation of timestamp subtracting interval is almost repetitive with TimeAdd. We can replace it with TimeAdd(l, -r) since there are equivalent. Suggestion from https://github.com/apache/spark/pull/28310#discussion_r414259239 Besides, the Coercion rules for TimeAdd/TimeSub(date, interval) are useless anymore, so remove them in this PR since they are touched in this PR. ### Why are the changes needed? remove redundant and useless code for easy maintenance ### Does this PR introduce any user-facing change? Yes, the SQL string of `datetime - interval` become `datetime + (- interval)` ### How was this patch tested? modified existing unit tests. Closes #28381 from yaooqinn/SPARK-31586. Authored-by: Kent Yao <yaooqinn@hotmail.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> |
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