Sheng Wang created IMPALA-11040:
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Summary: Query get stuck when containing multiple union in reAnalyze phase
Key: IMPALA-11040
URL: https://issues.apache.org/jira/browse/IMPALA-11040
Project: IMPALA
Issue Type: Question
Components: Frontend
Affects Versions: Impala 4.0.0
Reporter: Sheng Wang
Assignee: Sheng Wang
When query contains multiple union, and encounter a expr rewrite. Then this query will do 'reAnalyze', and get stuck in 'reset' method. Here is the example to reproduce this bug:
{code:java}
SELECT `t1`.`dt`
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM
(SELECT '20211020' AS `dt`
UNION ALL SELECT '20211021' AS `dt`) AS `t`
UNION ALL SELECT '20211022' AS `dt`) AS `t`
UNION ALL SELECT '20211023' AS `dt`) AS `t`
UNION ALL SELECT '20211024' AS `dt`) AS `t`
UNION ALL SELECT '20211025' AS `dt`) AS `t`
UNION ALL SELECT '20211026' AS `dt`) AS `t`
UNION ALL SELECT '20211027' AS `dt`) AS `t`
UNION ALL SELECT '20211028' AS `dt`) AS `t`
UNION ALL SELECT '20211029' AS `dt`) AS `t`
UNION ALL SELECT '20211030' AS `dt`) AS `t`
UNION ALL SELECT '20211031' AS `dt`) AS `t`
UNION ALL SELECT '20211101' AS `dt`) AS `t`
UNION ALL SELECT '20211102' AS `dt`) AS `t`
UNION ALL SELECT '20211103' AS `dt`) AS `t`
UNION ALL SELECT '20211104' AS `dt`) AS `t`
UNION ALL SELECT '20211105' AS `dt`) AS `t`
UNION ALL SELECT '20211106' AS `dt`) AS `t`
UNION ALL SELECT '20211107' AS `dt`) AS `t`
UNION ALL SELECT '20211108' AS `dt`) AS `t`
UNION ALL SELECT '20211109' AS `dt`) AS `t`
UNION ALL SELECT '20211110' AS `dt`) AS `t`
UNION ALL SELECT '20211111' AS `dt`) AS `t`
UNION ALL SELECT '20211112' AS `dt`) AS `t`
UNION ALL SELECT '20211113' AS `dt`) AS `t`
UNION ALL SELECT '20211114' AS `dt`) AS `t`
UNION ALL SELECT '20211115' AS `dt`) AS `t`
UNION ALL SELECT '20211116' AS `dt`) AS `t`
UNION ALL SELECT '20211117' AS `dt`) AS `t`
UNION ALL SELECT '20211118' AS `dt`) AS `t`
UNION ALL SELECT '20211119' AS `dt`) AS `t`
UNION ALL SELECT '20211120' AS `dt`) AS `t1`
CROSS JOIN
(SELECT 1000+1000) AS `t2`
GROUP BY `t1`.`dt`;
{code}
This query may take long time to execute, such as ten minutes. If we reduce 'UNION', the query will execute quickly.
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