Xiao Li created SPARK-23937:
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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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