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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