cloud-fan commented on issue #26412: [SPARK-29774][SQL] Date and Timestamp type +/- null should be null as Postgres URL: https://github.com/apache/spark/pull/26412#issuecomment-561978229 It seems like `UnresolvedBinaryExpression` brings some troubles and may add maintenance overhead. How about this: 1. We still create `Add` in the parser 2. type coercion rules only deal with the normal Add operation, e.g. int + int, interval + interval. 3. the new rule `ResolveBinaryArithmetic` finds the unresolved `Add`, and turn them into `DateAdd`, etc. depending on the data types.
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