Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/15513#discussion_r84824076 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala --- @@ -24,7 +24,17 @@ import org.apache.spark.sql.types._ // scalastyle:off line.size.limit @ExpressionDescription( - usage = "_FUNC_(expr1,expr2,expr3) - If expr1 is TRUE then IF() returns expr2; otherwise it returns expr3.") + usage = "_FUNC_(expr1, expr2, expr3) - If expr1 is TRUE then IF() returns expr2; otherwise it returns expr3.", + extended = """ + Arguments: + expr1 - a boolean expression. + expr2 - an expression of any type that represents the return value when expr1 is TRUE. --- End diff -- `when expr1 is TRUE` -> `when expr1 evaluates to true.`
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