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https://issues.apache.org/jira/browse/BEAM-6861?focusedWorklogId=216089&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-216089
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ASF GitHub Bot logged work on BEAM-6861:
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Author: ASF GitHub Bot
Created on: 20/Mar/19 09:59
Start Date: 20/Mar/19 09:59
Worklog Time Spent: 10m
Work Description: stankiewicz commented on issue #8090: [BEAM-6861]
Select fields and computed fields in CassandraIO.Read
URL: https://github.com/apache/beam/pull/8090#issuecomment-474762545
@iemejia , thanks for feedback - challenge with withQuery in JdbcIO is that
it is expected to be full query, like `select a from b` or `select a from b
where c='d'`.
In CassandraIO select is generated so it can be split based on key ranges so
'where' part is partially dynamic so where part is set via separate field and I
want select fields also set via seperate field/list of fields.
That's why external builder can be challenge to support every case, unless
it gives placeholder for each of those (select fields, where fields).
So I generally agree we need some more generic but I don't think I could
generalize mentioned MongoDB (BEAM-6241) and Cassandra query builder because
they are totally different but definately I could try to create such builder
for Cassandra that will gather projection/select fields and filter
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Issue Time Tracking
-------------------
Worklog Id: (was: 216089)
Time Spent: 2h 10m (was: 2h)
> Select fields and computed fields in CassandraIO.Read
> ------------------------------------------------------
>
> Key: BEAM-6861
> URL: https://issues.apache.org/jira/browse/BEAM-6861
> Project: Beam
> Issue Type: Improvement
> Components: io-java-cassandra
> Reporter: Radosław Stankiewicz
> Assignee: Radosław Stankiewicz
> Priority: Minor
> Labels: features
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> CassandraIO.Read currently selects all fields and maps them to POJO.
> To make this component more flexible, it should be possible to select only
> subset of fields or computed fields to allow reading things like write
> Timestamp or using other functions.
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