[ https://issues.apache.org/jira/browse/SPARK-23939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-23939: ------------------------------------ Assignee: Apache Spark > High-order function: transform_keys(map<K1, V>, function<K1, V, K2>) → > map<K2,V> > -------------------------------------------------------------------------------- > > Key: SPARK-23939 > URL: https://issues.apache.org/jira/browse/SPARK-23939 > Project: Spark > Issue Type: Sub-task > Components: SQL > Affects Versions: 2.3.0 > Reporter: Xiao Li > Assignee: Apache Spark > Priority: Major > > Ref: https://prestodb.io/docs/current/functions/map.html > Returns a map that applies function to each entry of map and transforms the > keys. > {noformat} > SELECT transform_keys(MAP(ARRAY[], ARRAY[]), (k, v) -> k + 1); -- {} > SELECT transform_keys(MAP(ARRAY [1, 2, 3], ARRAY ['a', 'b', 'c']), (k, v) -> > k + 1); -- {2 -> a, 3 -> b, 4 -> c} > SELECT transform_keys(MAP(ARRAY ['a', 'b', 'c'], ARRAY [1, 2, 3]), (k, v) -> > v * v); -- {1 -> 1, 4 -> 2, 9 -> 3} > SELECT transform_keys(MAP(ARRAY ['a', 'b'], ARRAY [1, 2]), (k, v) -> k || > CAST(v as VARCHAR)); -- {a1 -> 1, b2 -> 2} > SELECT transform_keys(MAP(ARRAY [1, 2], ARRAY [1.0, 1.4]), -- {one -> 1.0, > two -> 1.4} > (k, v) -> MAP(ARRAY[1, 2], ARRAY['one', 'two'])[k]); > {noformat} -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org