[GitHub] [spark] gengliangwang commented on a change in pull request #26112: [SPARK-29364][SQL] Return an interval from date subtract according to SQL standard

[GitBox <gi...@apache.org>]

gengliangwang commented on a change in pull request #26112: [SPARK-29364][SQL] Return an interval from date subtract according to SQL standard
URL: https://github.com/apache/spark/pull/26112#discussion_r334879394
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
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 @@ -849,12 +850,18 @@ object TypeCoercion {
       case Add(l @ DateType(), r @ IntegerType()) => DateAdd(l, r)
       case Add(l @ IntegerType(), r @ DateType()) => DateAdd(r, l)
       case Subtract(l @ DateType(), r @ IntegerType()) => DateSub(l, r)
-      case Subtract(l @ DateType(), r @ DateType()) => DateDiff(l, r)
-      case Subtract(l @ TimestampType(), r @ TimestampType()) => TimestampDiff(l, r)
+      case Subtract(l @ DateType(), r @ DateType()) =>
+        if (SQLConf.get.getConf(SQLConf.LEGACY_DATES_SUBTRACTION)) {
 
 Review comment:
   How about `spark.sql.dialect.spark.datesSubtraction.enabled`

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