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https://issues.apache.org/jira/browse/HIVE-28098?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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okumin updated HIVE-28098:
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Summary: Fails to copy empty column statistics of materialized CTE (was:
Fails to generate statistics of materialized CTE)
> Fails to copy empty column statistics of materialized CTE
> ---------------------------------------------------------
>
> Key: HIVE-28098
> URL: https://issues.apache.org/jira/browse/HIVE-28098
> Project: Hive
> Issue Type: Bug
> Components: Query Planning
> Reporter: okumin
> Assignee: okumin
> Priority: Major
>
> HIVE-28080 introduced the optimization of materialized CTEs, but it turned
> out that it failed when statistics were empty.
> This query reproduces the issue.
> {code:java}
> set hive.stats.autogather=false;
> CREATE TABLE src_no_stats AS SELECT '123' as key, 'val123' as value UNION ALL
> SELECT '99999' as key, 'val99999' as value;
> set hive.optimize.cte.materialize.threshold=2;
> set hive.optimize.cte.materialize.full.aggregate.only=false;
> EXPLAIN WITH materialized_cte1 AS (
> SELECT * FROM src_no_stats
> ),
> materialized_cte2 AS (
> SELECT a.key
> FROM materialized_cte1 a
> JOIN materialized_cte1 b ON (a.key = b.key)
> )
> SELECT a.key
> FROM materialized_cte2 a
> JOIN materialized_cte2 b ON (a.key = b.key); {code}
> It throws an error.
> {code:java}
> Error: Error while compiling statement: FAILED: IllegalStateException The
> size of col stats must be equal to that of schema. Stats = [], Schema = [key]
> (state=42000,code=40000) {code}
> Attaching a debugger, FSO of materialized_cte2 has empty stats as
> JoinOperator loses stats.
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