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_r375092082
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File path: sql/core/src/main/scala/org/apache/spark/sql/functions.scala
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@@ -3530,6 +3576,12 @@ object functions {
/**
* Applies a function to every key-value pair in a map and returns
* a map with the results of those applications as the new keys for the
pairs.
+ * {{{
+ * df.select(transform_keys(col("i"), (k, v) => k + v))
+ * }}}
+ *
+ * @param expr the input map column
+ * @param f col => k_transformed_col, the lambda function to transform the
key of input column
Review comment:
`(key, value) => new_key`
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