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https://issues.apache.org/jira/browse/IMPALA-13786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Riza Suminto resolved IMPALA-13786.
-----------------------------------
Fix Version/s: Impala 4.6.0
Target Version: Impala 4.6.0
Resolution: Fixed
The workaround for this issue is to always put column alias in every select
statement in View or Subquery.
> Simple rewrite of cast expression may fail in certain VARCHAR cases
> -------------------------------------------------------------------
>
> Key: IMPALA-13786
> URL: https://issues.apache.org/jira/browse/IMPALA-13786
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Reporter: Yida Wu
> Assignee: Riza Suminto
> Priority: Critical
> Fix For: Impala 4.6.0
>
>
> IMPALA-10836 introduced the SimplifyCastExprRule optimization to simplify
> CAST expressions. However, in certain cases involving VARCHAR and column
> alias, this rule may cause failures during the analysis phase like below:
> {code:java}
> CREATE VIEW failing_view(`123456`) AS
> SELECT
> CAST(`123456` AS VARCHAR(5))
> FROM
> (
> SELECT
> CAST(`123456` AS VARCHAR(5)) `123456`
> FROM
> (
> SELECT
> "text" AS `123456`
> ) b
> ) a;
> SELECT * FROM failing_view;
> Expected:
> +--------+
> | 123456 |
> +--------+
> | text |
> +--------+
> Actual Result:
> ERROR: Query failed:
> AnalysisException: An error occurred after query rewrite: Could not resolve
> column/field reference: 'failing_view._c0'
> CAUSED BY: AnalysisException: Could not resolve column/field reference:
> 'failing_view._c0'
> {code}
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