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Posted to dev@flink.apache.org by "Timo Walther (Jira)" <ji...@apache.org> on 2020/06/23 13:27:00 UTC

[jira] [Created] (FLINK-18417) Support List as a conversion class for ARRAY

Timo Walther created FLINK-18417:
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             Summary: Support List as a conversion class for ARRAY
                 Key: FLINK-18417
                 URL: https://issues.apache.org/jira/browse/FLINK-18417
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / API
            Reporter: Timo Walther
            Assignee: Timo Walther


Currently we don't support {{List}} as a conversion class in the new type system. However, there are multiple reasons why we should support this conversion:
1) Hive uses {{List}} as the default for representing arrays e.g. in functions.
2) The new Expression DSL supports converting lists to array literals already.
3) The list interface is essential for Java users and part of many structured types.
4) We need to represent lists in {{ListView}} for aggregate functions.



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