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https://issues.apache.org/jira/browse/BEAM-6810?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kenneth Knowles resolved BEAM-6810.
-----------------------------------
Resolution: Fixed
> [SQL] Plan optimizer eliminates aliasing in trivial projections
> ---------------------------------------------------------------
>
> Key: BEAM-6810
> URL: https://issues.apache.org/jira/browse/BEAM-6810
> Project: Beam
> Issue Type: Bug
> Components: dsl-sql
> Affects Versions: 2.11.0
> Reporter: Gleb Kanterov
> Assignee: Gleb Kanterov
> Priority: Major
> Fix For: 2.12.0
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Trivial programs project precisely their input fields, without dropping or
> re-ordering them. The simplest example is:
> {code}
> SELECT * FROM PCOLLECTION
> {code}
> Given input PCollection with a schema `c_int64: BIGINT` following query
> should result in PCollection with a schema `abc: BIGINT`, however, due to a
> bug in query optimization, it results in `c_int64: BIGINT`
> {code}
> SELECT c_int64 as abc FROM PCOLLECTION
> {code}
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