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_r304996995
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
 ##########
 @@ -840,3 +840,46 @@ case class GreaterThanOrEqual(left: Expression, right: 
Expression)
 
   protected override def nullSafeEval(input1: Any, input2: Any): Any = 
ordering.gteq(input1, input2)
 }
+
+/**
+ * Test the value of an expression is true, false, or unknown.
+ */
+@ExpressionDescription(
+  usage = "_FUNC_(expr, booleanValue) - Returns true if `expr` equals 
booleanValue, " +
+    "or false otherwise.",
+  arguments = """
+    Arguments:
+      * expr - a boolean expression
+      * booleanValue - a boolean value represented by a string. booleanValue 
must be one
+          of TRUE, FALSE and UNKNOWN.
+  """,
+  examples = """
+    Examples:
+    > SELECT _FUNC_(1 > 2, true);
+       false
+    > SELECT _FUNC_(2 > 1, true);
 
 Review comment:
   Thank you for checking. Then, let's remove this `@ExpressionDescription` 
annotation. We don't need this. 

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