Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22029#discussion_r229692081
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
---
@@ -202,7 +225,11 @@ case class InSubquery(values: Seq[Expression], query:
ListQuery)
*/
// scalastyle:off line.size.limit
@ExpressionDescription(
- usage = "expr1 _FUNC_(expr2, expr3, ...) - Returns true if `expr` equals
to any valN.",
+ usage = """
+ expr1 _FUNC_(expr2, expr3, ...) - Returns true if `expr` equals to any
valN. Otherwise, if
+ spark.sql.legacy.inOperator.falseForNullField is false and any of
the elements or fields of
--- End diff --
`any of the elements or fields ...`
We should explicitly mention multi-column IN, which is different from `a in
(b, c, ...)` while `a` is struct type.
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