cloud-fan commented on a change in pull request #27336:
[SPARK-28962][SQL][FOLLOW-UP] Add the parameter description for the Scala
function API filter
URL: https://github.com/apache/spark/pull/27336#discussion_r374494773
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File path: sql/core/src/main/scala/org/apache/spark/sql/functions.scala
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@@ -3465,6 +3472,14 @@ object functions {
/**
* Returns an array of elements for which a predicate holds in a given array.
+ * {{{
+ * df.select(filter(col("s"), (x, i) => i % 2 === 0))
+ * df.selectExpr("filter(col, (x, i) -> i % 2 == 0)")
+ * }}}
+ *
+ * @param column: the input array column
+ * @param f: (col, index) => predicate, the boolean predicate to filter the
input column
+ * given the index. Indices start at 0.
Review comment:
is this consistent within Spark that the indices parameter starts with 0 in
higher-order functions? @ueshin @HyukjinKwon
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