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https://issues.apache.org/jira/browse/BEAM-6861?focusedWorklogId=216093&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-216093
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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 10:02
Start Date: 20/Mar/19 10:02
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 separate field/list of fields.
That's why external (generic to all APIs) builder can be challenge to
support every case, unless it gives placeholder for each of those (select
fields, where fields).
So I generally agree about cleaning it up but I don't think I could
generalize mentioned MongoDB (BEAM-6241) or JdbcIO and reuse it in CassandraIO
query builder because they are totally different but definitely I could try to
create such builder for Cassandra that will gather projection/select fields and
filter and will produce query for CassandraIO
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Issue Time Tracking
-------------------
Worklog Id: (was: 216093)
Time Spent: 2.5h (was: 2h 20m)
> 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: 2.5h
> 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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