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https://issues.apache.org/jira/browse/CALCITE-4838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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xiong duan updated CALCITE-4838:
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Summary: Add RoundingMode in RelDataTypeSystem to specify the rounding
behavior (was: add roundingMode in SqlConformance to document the rounding
mode when cast an approximate numeric to int)
> Add RoundingMode in RelDataTypeSystem to specify the rounding behavior
> ----------------------------------------------------------------------
>
> Key: CALCITE-4838
> URL: https://issues.apache.org/jira/browse/CALCITE-4838
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.27.0
> Reporter: xiong duan
> Assignee: xiong duan
> Priority: Major
> Labels: pull-request-available
>
> According to the SQL Strandard about how to cast an approximate numeric to
> int in different database have different RoundingMode. for example:
> In PostgreSQL、Mysql、Oracle(RoundingMode.HALF_UP):
> {code:java}
> select cast(5.1 as int) return 5
> select cast(5.5 as int) return 6
> select cast(-5.5 as int) return -6{code}
> In Calcite、Sql Server 2008(RoundingMode.DOWN):
> {code:java}
> select cast(5.1 as int) return 5
> select cast(5.5 as int) return 5
> select cast(-5.5 as int) return -5
> {code}
>
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