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https://issues.apache.org/jira/browse/FLINK-19108?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated FLINK-19108:
-----------------------------------
Labels: pull-request-available (was: )
> Stop expanding the identifiers with scope aliased by the system with 'EXPR$'
> prefix
> -----------------------------------------------------------------------------------
>
> Key: FLINK-19108
> URL: https://issues.apache.org/jira/browse/FLINK-19108
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API
> Affects Versions: 1.12.0, 1.11.2
> Reporter: Danny Chen
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.12.0, 1.11.2
>
>
> For query
> {code:sql}
> create view tmp_view as
> select * from (
> select f0,
> row_number() over (partition by f0 order by f0 desc) as rowNum
> from source) -- the query would be aliased as "EXPR$1"
> where rowNum = 1
> {code}
> When validation, the inner query would have alias assigned by the system with
> prefix "EXPR$1", when in the `Expander`, we replace the id in the inner query
> all with this prefix which is wrong because we do not add the alias to the
> inner query anymore.
> To solve the problem, skip the expanding of id with "EXPR$" just like how
> {{SqlUtil#deriveAliasFromOrdinal}} added it.
> This was introduced by FLINK-18750.
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