[jira] [Created] (FLINK-6424) Add basic helper functions for map type

[Shang Yuanchun (Jira)]

Timo Walther created FLINK-6424:
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             Summary: Add basic helper functions for map type
                 Key: FLINK-6424
                 URL: https://issues.apache.org/jira/browse/FLINK-6424
             Project: Flink
          Issue Type: New Feature
          Components: Table API & SQL
            Reporter: Timo Walther


FLINK-6377 introduced the map type for the Table & SQL API. We still need to implement functions around this type:

- the value constructor in SQL that constructs a map {{MAP ‘[’ key, value [, key, value ]* ‘]’}}
- the value constructur in Table API {{map(key, value,...)}} (syntax up for discussion)
- {{ELEMENT, CARDINALITY}} for SQL API
- {{.at(), .cardinality(), and .element()}} for Table API in Scala & Java




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