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https://issues.apache.org/jira/browse/HIVE-17716?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesus Camacho Rodriguez reassigned HIVE-17716:
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Assignee: (was: Jesus Camacho Rodriguez)
> Not pushing postaggregations into Druid due to CAST on constant
> ---------------------------------------------------------------
>
> Key: HIVE-17716
> URL: https://issues.apache.org/jira/browse/HIVE-17716
> Project: Hive
> Issue Type: Improvement
> Components: Druid integration
> Reporter: Jesus Camacho Rodriguez
>
> After Calcite is upgraded to 1.14 and the rule to push post-aggregations to
> Druid is enabled, the following query fails to create a postaggregation:
> {code}
> EXPLAIN
> SELECT language, sum(added) + 100 AS a
> FROM druid_table_1
> GROUP BY language
> ORDER BY a DESC;
> {code}
> Problem seems to be that CAST is getting on the way for the rule to be
> applied. In particular, this is the final Calcite plan:
> {code}
> HiveSortLimit(sort0=[$1], dir0=[DESC-nulls-last])
> HiveProject(language=[$0], a=[+($1, CAST(100):DOUBLE)])
> DruidQuery(table=[[default.druid_table_1]],
> intervals=[[1900-01-01T00:00:00.000/3000-01-01T00:00:00.000]], groups=[{6}],
> aggs=[[sum($10)]])
> {code}
> There are two different parts to explore to seek a solution: 1) why
> {{CAST(100):DOUBLE)}} is not folded to {{100.0d}}, and 2) whether the rule to
> push post-aggregations to Druid could handle the CAST in some particular
> cases.
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