[GitHub] [spark] LuciferYang commented on a diff in pull request #40120: [SPARK-42527][CONNECT] Scala Client add Window functions

["LuciferYang (via GitHub)" <gi...@apache.org>]

LuciferYang commented on code in PR #40120:
URL: https://github.com/apache/spark/pull/40120#discussion_r1113998748


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connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/functions.scala:
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@@ -129,7 +132,7 @@ object functions {
       case v: Array[Byte] => createLiteral(_.setBinary(ByteString.copyFrom(v)))
       case v: collection.mutable.WrappedArray[_] => lit(v.array)
       case v: LocalDate => createLiteral(_.setDate(v.toEpochDay.toInt))
-      case null => unsupported("Null literals not supported yet.")
+      case null => createLiteral(_.setNull(nullType))

Review Comment:
   `lag` and `lead` need pass null



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