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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8038) Support MAP value constructor
Date Thu, 16 Nov 2017 13:17:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16255270#comment-16255270
] 

ASF GitHub Bot commented on FLINK-8038:
---------------------------------------

Github user twalthr commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5015#discussion_r151401984
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/scala/expressionDsl.scala
---
    @@ -705,6 +705,14 @@ trait ImplicitExpressionOperations {
         */
       def element() = ArrayElement(expr)
     
    +  /**
    +    * Accesses the element of a map based on key.
    +    *
    +    * @param key key of the element
    +    * @return value of the element
    +    */
    +  def getValue(key: Expression) = MapElementGetValue(expr, key)
    --- End diff --
    
    Can we use `at()` instead? I think this would make the API more consistent.


> Support MAP value constructor
> -----------------------------
>
>                 Key: FLINK-8038
>                 URL: https://issues.apache.org/jira/browse/FLINK-8038
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: Rong Rong
>            Assignee: Rong Rong
>
> Similar to https://issues.apache.org/jira/browse/FLINK-4554
> We want to support Map value constructor which is supported by Calcite:
> https://calcite.apache.org/docs/reference.html#value-constructors
> {code:sql}
> SELECT
>   MAP['key1', f0, 'key2', f1] AS stringKeyedMap,
>   MAP['key', 'value'] AS literalMap,
>   MAP[f0, f1] AS fieldMap
> FROM
>   table
> {code}
> This should enable users to construct MapTypeInfo, one of the CompositeType.



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