Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/15677#discussion_r85976537
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala
---
@@ -24,7 +24,12 @@ 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` evaluates to true,
then returns `expr2`; otherwise it returns `expr3`.",
--- End diff --
`it returns` -> `returns`
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