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https://issues.apache.org/jira/browse/CALCITE-6919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alessandro Solimando resolved CALCITE-6919.
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Resolution: Not A Problem
> Invalid unparse for CHAR without precision in PostgreSQL
> --------------------------------------------------------
>
> Key: CALCITE-6919
> URL: https://issues.apache.org/jira/browse/CALCITE-6919
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.39.0
> Reporter: Yu Xu
> Assignee: Yu Xu
> Priority: Major
> Labels: pull-request-available
>
> In postgresql cast char with out precision would be char(1), it is keep the
> same behavior with Mysql from test.
> eg:
> {code:java}
> select cast(product_id as char) from product {code}
> expected:
> {code:java}
> select cast(product_id as char) from product {code}
> but was:
> {code:java}
> select cast(product_id as char(1)) from product {code}
>
> need to fix the cast logical
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