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From "holdenk (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SPARK-23940) High-order function: transform_values(map<K, V1>, function<K, V1, V2>) → map<K, V2>
Date Mon, 14 May 2018 20:25:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-23940?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

holdenk updated SPARK-23940:
----------------------------
    Labels: starter  (was: )

> High-order function: transform_values(map<K, V1>, function<K, V1, V2>) →
map<K, V2>
> -----------------------------------------------------------------------------------
>
>                 Key: SPARK-23940
>                 URL: https://issues.apache.org/jira/browse/SPARK-23940
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: Xiao Li
>            Priority: Major
>              Labels: starter
>
> Ref: https://prestodb.io/docs/current/functions/map.html
> Returns a map that applies function to each entry of map and transforms the values.
> {noformat}
> SELECT transform_values(MAP(ARRAY[], ARRAY[]), (k, v) -> v + 1); -- {}
> SELECT transform_values(MAP(ARRAY [1, 2, 3], ARRAY [10, 20, 30]), (k, v) -> v + k);
-- {1 -> 11, 2 -> 22, 3 -> 33}
> SELECT transform_values(MAP(ARRAY [1, 2, 3], ARRAY ['a', 'b', 'c']), (k, v) -> k *
k); -- {1 -> 1, 2 -> 4, 3 -> 9}
> SELECT transform_values(MAP(ARRAY ['a', 'b'], ARRAY [1, 2]), (k, v) -> k || CAST(v
as VARCHAR)); -- {a -> a1, b -> b2}
> SELECT transform_values(MAP(ARRAY [1, 2], ARRAY [1.0, 1.4]), -- {1 -> one_1.0, 2 ->
two_1.4}
>                         (k, v) -> MAP(ARRAY[1, 2], ARRAY['one', 'two'])[k] || '_'
|| CAST(v AS VARCHAR));
> {noformat}



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