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https://issues.apache.org/jira/browse/CALCITE-6849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17929052#comment-17929052
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Julian Hyde commented on CALCITE-6849:
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This change is welcome, but it must be accompanied by a good test framework.
> Support specific default type systems for differnent DatabaseProduct
> --------------------------------------------------------------------
>
> Key: CALCITE-6849
> URL: https://issues.apache.org/jira/browse/CALCITE-6849
> Project: Calcite
> Issue Type: Bug
> Reporter: xiong duan
> Priority: Major
>
> Each database system adheres to its own set of type standards. In the current
> version of Calcite, there exist partial implementations that cater to the
> distinct type requirements of various databases. To ensure a consistent
> approach to resolving similar challenges in the future, it is proposed to
> develop unified, database-specific type systems, such as SparkTypeSystem and
> HiveTypeSystem.
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