Xiao Li created SPARK-23940:
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Summary: High-ofer 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
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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