cloud-fan commented on a change in pull request #26763: [SPARK-30125][SQL] 
Remove PostgreSQL dialect
URL: https://github.com/apache/spark/pull/26763#discussion_r354299520
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
 ##########
 @@ -2143,25 +2143,3 @@ case class SubtractTimestamps(endTimestamp: Expression, 
startTimestamp: Expressi
       s"new org.apache.spark.unsafe.types.CalendarInterval(0, 0, $end - 
$start)")
   }
 }
-
-/**
- * Returns the interval from the `left` date (inclusive) to the `right` date 
(exclusive).
- */
-case class SubtractDates(left: Expression, right: Expression)
 
 Review comment:
   ditto

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