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Posted to issues@spark.apache.org by "Marek Novotny (JIRA)" <ji...@apache.org> on 2018/08/06 12:30:00 UTC
[jira] [Commented] (SPARK-23938) High-order function: map_zip_with(map, map, function) → map
[ https://issues.apache.org/jira/browse/SPARK-23938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16570148#comment-16570148 ]
Marek Novotny commented on SPARK-23938:
---------------------------------------
I'm working on this. Thanks.
> High-order function: map_zip_with(map<K, V1>, map<K, V2>, function<K, V1, V2, V3>) → map<K, V3>
> -----------------------------------------------------------------------------------------------
>
> Key: SPARK-23938
> URL: https://issues.apache.org/jira/browse/SPARK-23938
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Xiao Li
> Priority: Major
>
> Ref: https://prestodb.io/docs/current/functions/map.html
> Merges the two given maps into a single map by applying function to the pair of values with the same key. For keys only presented in one map, NULL will be passed as the value for the missing key.
> {noformat}
> SELECT map_zip_with(MAP(ARRAY[1, 2, 3], ARRAY['a', 'b', 'c']), -- {1 -> ad, 2 -> be, 3 -> cf}
> MAP(ARRAY[1, 2, 3], ARRAY['d', 'e', 'f']),
> (k, v1, v2) -> concat(v1, v2));
> SELECT map_zip_with(MAP(ARRAY['k1', 'k2'], ARRAY[1, 2]), -- {k1 -> ROW(1, null), k2 -> ROW(2, 4), k3 -> ROW(null, 9)}
> MAP(ARRAY['k2', 'k3'], ARRAY[4, 9]),
> (k, v1, v2) -> (v1, v2));
> SELECT map_zip_with(MAP(ARRAY['a', 'b', 'c'], ARRAY[1, 8, 27]), -- {a -> a1, b -> b4, c -> c9}
> MAP(ARRAY['a', 'b', 'c'], ARRAY[1, 2, 3]),
> (k, v1, v2) -> k || CAST(v1/v2 AS VARCHAR));
> {noformat}
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