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https://issues.apache.org/jira/browse/CALCITE-4536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17302917#comment-17302917
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Stamatis Zampetakis commented on CALCITE-4536:
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Not sure I get the problem. If I am not wrong minus seven (-7) corresponds to 
java.sql.Types.BIT. Is the following discussion relevant: 
https://www.postgresql.org/message-id/[email protected]

> avatica can not recognize the type -7
> -------------------------------------
>
>                 Key: CALCITE-4536
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4536
>             Project: Calcite
>          Issue Type: Bug
>          Components: avatica
>    Affects Versions: avatica-1.17.0
>            Reporter: zengrui
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> The bool Type in PostGresql is -7, but avatica can not recognize this type.
> If the ResultSet contains a column in this type, it will throw an exception: 
> unknown type -7



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