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