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https://issues.apache.org/jira/browse/CALCITE-2933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16796912#comment-16796912
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Danny Chan commented on CALCITE-2933:
-------------------------------------
[~zhztheplayer] It seems that the error does not has any relationship with the
cast func reduction, i have tried
{code:java}
Select cast(\"store_sales\" as varchar) as t from \"foodmart\" order by t limit
1
{code}
and
{code:java}
Select cast(\"timestamp\" as varchar) as t from \"foodmart\" order by t limit 1
{code}
they all throw the same exception. I tried to open the debug log of Druid
server, but i don't know where it is yet.
> In Druid adapter, expression like "cast(cast(\"timestamp\" as timestamp) as
> varchar)" returns as epoch millisecond
> ------------------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-2933
> URL: https://issues.apache.org/jira/browse/CALCITE-2933
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.18.0
> Reporter: Hongze Zhang
> Assignee: Danny Chan
> Priority: Major
>
> SQL 1:
> {code}
> select cast("timestamp" as timestamp) as t from "foodmart" order by t limit 1
> {code}
> Result:
> {code}
> T=1997-01-01 00:00:00
> {code}
> SQL 2:
> {code}
> select cast(cast("timestamp" as timestamp) as varchar) as t from "foodmart"
> order by t limit 1
> {code}
> Result:
> {code}
> T=852076800000
> {code}
> The second query should returns with the same format as the first one.
> See test case:
> https://github.com/apache/calcite/blob/1229ef27094ea73ad9c7a397f442285c7e1df9b0/druid/src/test/java/org/apache/calcite/test/DruidAdapterIT2.java#L3930
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