[GitHub] [spark] Ngone51 commented on a change in pull request #27449: [SPARK-27297][DOC][FOLLOW-UP] Improve documentation for various Scala functions

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Ngone51 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_r374586965
 
 

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 File path: sql/core/src/main/scala/org/apache/spark/sql/functions.scala
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 @@ -3421,6 +3428,14 @@ object functions {
   /**
    * Returns an array of elements after applying a transformation to each element
    * in the input array.
+   * {{{
+   *   df.select(transform(col("i"), (x, i) => x + i))
+   *   df.selectExpr("transform(i, (x, i) -> x + i))")
+   * }}}
+   *
+   * @param column the input array column
+   * @param f: (col, index) => transformed_col the lambda function to filter the input column
+   *           given the index. Indices start at 0.
 
 Review comment:
   Examples are copied from tests and it starts from 0 if you look at the test result:
   
   https://github.com/apache/spark/blob/8aebc80e0e67bcb1aa300b8c8b1a209159237632/sql/core/src/test/scala/org/apache/spark/sql/DataFrameFunctionsSuite.scala#L2026

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