Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/12185#discussion_r59123665
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala
---
@@ -23,7 +23,10 @@ import
org.apache.spark.sql.catalyst.expressions.codegen._
import org.apache.spark.sql.catalyst.util.TypeUtils
import org.apache.spark.sql.types._
-
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage = "_FUNC_(expr1,expr2,expr3) - If expr1 is TRUE (expr1 <> 0 and
expr1 <> NULL) then IF() returns expr2; otherwise it returns expr3.")
--- End diff --
I will remove them. Actually it describes the definition of the previous
clause `expr1 is TRUE`.
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