Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15513#discussion_r85625901
--- 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` evaluates to true,
then 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` evaluates to true.
+ expr3 - an expression of any type that represents the return value
when `expr1` evaluates to false.
--- End diff --
```sql
spark-sql> SELECT if(true, array(1), array(1)), if(false, struct(1),
struct(1)), if(true, map(1, 1), map(1, 1));
[1] {"col1":1} {1:1}
```
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