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https://issues.apache.org/jira/browse/FLINK-8038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16255277#comment-16255277
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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_r151408733
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/validate/FunctionCatalog.scala
---
@@ -333,6 +337,10 @@ class BasicOperatorTable extends
ReflectiveSqlOperatorTable {
SqlStdOperatorTable.ITEM,
SqlStdOperatorTable.CARDINALITY,
SqlStdOperatorTable.ELEMENT,
+ // MAP OPERATORS
+ SqlStdOperatorTable.MAP_VALUE_CONSTRUCTOR,
+ SqlStdOperatorTable.ITEM,
--- End diff --
Btw there is no code that implements CARDINALITY. Can you add this call?
> 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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