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https://issues.apache.org/jira/browse/CALCITE-6431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17855910#comment-17855910
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xiong duan commented on CALCITE-6431:
-------------------------------------
Maybe Spark or Hive can optimize CASE WHEN:
CASE COUNT(*) WHEN 0 THEN NULL WHEN 1 THEN MIN(`product_class_id`) ELSE (SELECT
NULL UNION ALL SELECT NULL)
don't evaluate the subquery value first.
> Implement the SINGLE_VALUE aggregation in HiveSqlDialect And SparkSQLDialect
> ----------------------------------------------------------------------------
>
> Key: CALCITE-6431
> URL: https://issues.apache.org/jira/browse/CALCITE-6431
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.37.0
> Reporter: xiong duan
> Assignee: xiong duan
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.38.0
>
>
> When we use the SQL including the scalar query, converting this SQL Rel to
> HiveSQL will include the SINGLE_VALUE aggregation function(HiveSQL can't
> handle it) in the dialect SQL.
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