[jira] [Commented] (CALCITE-4379) Meta.Frame created with java float values in rows hits a ClassCastException in toProto()

["Dmitri Bourlatchkov (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-4379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17226912#comment-17226912 ] 

Dmitri Bourlatchkov commented on CALCITE-4379:
----------------------------------------------

Proposed PR: https://github.com/apache/calcite-avatica/pull/130

> Meta.Frame created with java float values in rows hits a ClassCastException in toProto()
> ----------------------------------------------------------------------------------------
>
>                 Key: CALCITE-4379
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4379
>             Project: Calcite
>          Issue Type: Bug
>          Components: avatica
>    Affects Versions: 1.17.0
>            Reporter: Dmitri Bourlatchkov
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Use case:
> * Custom {{Meta}} implementation
> * {{Meta.Frame.create(offset, done, rows)}} is called with a row (a {{List}}) containing a java {{Float}} value
> ** Note: the float value is fetched from Apache Cassandra, which has 32-bit float types (unlike SQL).
> ** Related [email discussion|https://mail-archives.apache.org/mod_mbox/calcite-dev/202011.mbox/%3CCAPSgeEREWLTNpBTpNBe4TY4hvwBWR9x-5BxAckKOTAE5QpoP9Q%40mail.gmail.com%3E] 
> * The {{Frame}} is serialized by calling its {{.toProto()}} method
> * ClassCastException occurs
> Exception snippet:
> {noformat}
> java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Float
> at org.apache.calcite.avatica.remote.TypedValue.writeToProtoWithType(TypedValue.java:600)
> at org.apache.calcite.avatica.remote.TypedValue.toProto(TypedValue.java:805)
> at org.apache.calcite.avatica.Meta$Frame.serializeScalar(Meta.java:991)
> at org.apache.calcite.avatica.Meta$Frame.parseColumn(Meta.java:977)
> at org.apache.calcite.avatica.Meta$Frame.toProto(Meta.java:942)
> at org.apache.calcite.avatica.remote.Service$FetchResponse.serialize(Service.java:1468)
> [...snip...]
> {noformat}



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