cloud-fan commented on a change in pull request #27449:
[SPARK-27297][DOC][FOLLOW-UP] Improve documentation for various Scala functions
URL: https://github.com/apache/spark/pull/27449#discussion_r375092341
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File path: sql/core/src/main/scala/org/apache/spark/sql/functions.scala
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@@ -3551,6 +3609,12 @@ object functions {
/**
* Returns a map whose key-value pairs satisfy a predicate.
+ * {{{
+ * df.select(map_filter(col("m"), (k, v) => k * 10 === v))
+ * }}}
+ *
+ * @param expr the input map column
+ * @param f (k, v) => predicate, the Boolean predicate to filter the input
map column
Review comment:
`(key, value) => predicate`
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