[jira] [Created] (SPARK-23937) High-order function: map_filter(map, function) → MAP

["Xiao Li (JIRA)" <ji...@apache.org>]

Xiao Li created SPARK-23937:
-------------------------------

             Summary: High-order function: map_filter(map<K, V>, function<K, V, boolean>) → MAP<K,V>
                 Key: SPARK-23937
                 URL: https://issues.apache.org/jira/browse/SPARK-23937
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
    Affects Versions: 2.3.0
            Reporter: Xiao Li


Constructs a map from those entries of map for which function returns true:

{noformat}
SELECT map_filter(MAP(ARRAY[], ARRAY[]), (k, v) -> true); -- {}
SELECT map_filter(MAP(ARRAY[10, 20, 30], ARRAY['a', NULL, 'c']), (k, v) -> v IS NOT NULL); -- {10 -> a, 30 -> c}
SELECT map_filter(MAP(ARRAY['k1', 'k2', 'k3'], ARRAY[20, 3, 15]), (k, v) -> v > 10); -- {k1 -> 20, k3 -> 15}

{noformat}



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