dongjoon-hyun commented on a change in pull request #25074: [SPARK-27924][SQL] 
Support ANSI SQL Boolean-Predicate syntax 
URL: https://github.com/apache/spark/pull/25074#discussion_r305595789
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
 ##########
 @@ -1243,6 +1244,12 @@ class AstBuilder(conf: SQLConf) extends 
SqlBaseBaseVisitor[AnyRef] with Logging
         IsNotNull(e)
       case SqlBaseParser.NULL =>
         IsNull(e)
+      case SqlBaseParser.TRUE =>
+        invertIfNotDefined(BooleanTest(e, Some(true)))
+      case SqlBaseParser.FALSE =>
+        invertIfNotDefined(BooleanTest(e, Some(false)))
+      case SqlBaseParser.UNKNOWN =>
+        invertIfNotDefined(BooleanTest(e, None))
 
 Review comment:
   I'm still reluctant for this as I mentioned before in my previous comments. 
The current PR direction is not aligned to the advice.

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