[
https://issues.apache.org/jira/browse/CALCITE-6061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17777358#comment-17777358
]
Ran Tao commented on CALCITE-6061:
----------------------------------
[~mbudiu] thanks for reviewing. Julian also explain this in another issue.
make sense to me.
> MapValueConstrcutor/MapQueryConstructor use LinkedHashMap erroneously
> ---------------------------------------------------------------------
>
> Key: CALCITE-6061
> URL: https://issues.apache.org/jira/browse/CALCITE-6061
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.35.0
> Reporter: Ran Tao
> Priority: Major
>
> when we call:
> {code:java}
> select map[1,2,3,4];{code}
> The order of results returned is the same every time. because calcite use
> LinkedHashMap for storage. But semantically, the order should not be
> guaranteed just like MULTISET.
> we can see other engines such as apache spark/flink just use HashMap in this
> case.
> [https://github.com/apache/flink/blob/a2681f6a85aaad21179f91e03a91b4a05158841e/flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/planner/codegen/ExprCodeGenerator.scala#L711]
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
