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Subject [GitHub] [spark] cloud-fan commented on a change in pull request #27449: [SPARK-27297][DOC][FOLLOW-UP] Improve documentation for various Scala functions
Date Wed, 05 Feb 2020 10:41:40 GMT
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_r375180719
 
 

 ##########
 File path: sql/core/src/main/scala/org/apache/spark/sql/functions.scala
 ##########
 @@ -3508,7 +3541,14 @@ object functions {
   /**
    * Applies a binary operator to an initial state and all elements in the array,
    * and reduces this to a single state.
+   * {{{
+   *   df.select(aggregate(col("i"), lit(0), (acc, x) => acc + x))
+   * }}}
    *
+   * @param expr the input array column
+   * @param zero the initial value
+   * @param merge (combined_value, input_value) => combined_value, the merge function
to to merge
 
 Review comment:
   ditto

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