yaooqinn commented on a change in pull request #26412: [SPARK-29774][SQL] Date 
and Timestamp type +/- null should be null as Postgres
URL: https://github.com/apache/spark/pull/26412#discussion_r353032252
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
 ##########
 @@ -246,6 +247,68 @@ class Analyzer(
       CleanupAliases)
   )
 
+  /**
+   * For [[UnresolvedAdd]]:
+   * 1. If one side is timestamp/date/string and the other side is interval, 
turns it to
 
 Review comment:
   we do not support cast int to interval, so interval + int is not supported.

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