[GitHub] spark pull request #17764: [SPARK-20463] Add support for IS [NOT] DISTINCT F...

[gatorsmile <gi...@git.apache.org>]

Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17764#discussion_r114160222
  
    --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala ---
    @@ -962,6 +962,11 @@ class AstBuilder extends SqlBaseBaseVisitor[AnyRef] with Logging {
             IsNotNull(e)
           case SqlBaseParser.NULL =>
             IsNull(e)
    +      case SqlBaseParser.DISTINCT =>
    +        ctx.NOT match {
    +          case null => Not(EqualTo(e, expression(ctx.right)))
    --- End diff --
    
    ```Scala
    case null => Not(EqualTo(e, expression(ctx.right)))
    ```
    ->
    ```Scala
    case null => Not(EqualNullSafe(e, expression(ctx.right)))
    ```


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