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https://issues.apache.org/jira/browse/CALCITE-5986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17763280#comment-17763280
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Julian Hyde commented on CALCITE-5986:
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I saw your PR.
* The "primary" and "secondary" concepts are very difficult to grasp. I think 
that the primary and secondary family methods in SqlTypeName need more 
documentation. 
* Do the methods both need to be nullable?
* I think that the getFamily method should be deprecated.
* "The SqlTypeFamily for FP types is incorrect" doesn't seem ready for release 
notes



> The SqlTypeFamily for FP types is incorrect
> -------------------------------------------
>
>                 Key: CALCITE-5986
>                 URL: https://issues.apache.org/jira/browse/CALCITE-5986
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.35.0
>            Reporter: Mihai Budiu
>            Priority: Minor
>              Labels: pull-request-available
>
> In SqlTypeFamily we have this code:
> {code:java}
> private static final Map<Integer, SqlTypeFamily> JDBC_TYPE_TO_FAMILY =
> ...
>           .put(Types.FLOAT, NUMERIC)
>           .put(Types.REAL, NUMERIC)
>           .put(Types.DOUBLE, NUMERIC)
> {code}
> But it looks to me like the type family should be APPROXIMATE_NUMERIC.
> This impacts the way RelToSqlConverter works, for instance.



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