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https://issues.apache.org/jira/browse/SPARK-23938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16570148#comment-16570148
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Marek Novotny commented on SPARK-23938:
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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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