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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