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xiong duan commented on CALCITE-6431: ------------------------------------- Spark and Hive will throw exception 'Scalar subquery expression returns more than one row' : {code:java} SELECT CASE COUNT(*) WHEN 0 THEN NULL WHEN 1 THEN MIN(`product_class_id`) ELSE (SELECT NULL UNION ALL SELECT NULL) END `$f0` FROM `foodmart`.`product`{code} It doesn't matter how much this expression(count(*)) returns, it will not affect the result. > 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. -- This message was sent by Atlassian Jira (v8.20.10#820010)