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https://issues.apache.org/jira/browse/CALCITE-6061?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ran Tao updated CALCITE-6061:
-----------------------------
Description:
when we call:
{code:java}
select map[1,2,3,4,5,6];{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.
{code:java}
Flink SQL> select map[1,2,3,4,5,6];
+----+--------------------------------+
| op | EXPR$0 |
+----+--------------------------------+
| +I | {5=6, 1=2, 3=4} |
+----+--------------------------------+
Received a total of 1 row {code}
it will return different result when you call it.
[https://github.com/apache/flink/blob/a2681f6a85aaad21179f91e03a91b4a05158841e/flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/planner/codegen/ExprCodeGenerator.scala#L711]
was:
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]
> MapValueConstructor/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[1,2,3,4,5,6];{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.
> {code:java}
> Flink SQL> select map[1,2,3,4,5,6];
> +----+--------------------------------+
> | op | EXPR$0 |
> +----+--------------------------------+
> | +I | {5=6, 1=2, 3=4} |
> +----+--------------------------------+
> Received a total of 1 row {code}
> it will return different result when you call it.
> [https://github.com/apache/flink/blob/a2681f6a85aaad21179f91e03a91b4a05158841e/flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/planner/codegen/ExprCodeGenerator.scala#L711]
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