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https://issues.apache.org/jira/browse/BEAM-7010?focusedWorklogId=224314&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-224314
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ASF GitHub Bot logged work on BEAM-7010:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 08/Apr/19 12:55
            Start Date: 08/Apr/19 12:55
    Worklog Time Spent: 10m 
      Work Description: kanterov commented on issue #8230: [BEAM-7010] 
MAX/MIN(STRING)
URL: https://github.com/apache/beam/pull/8230#issuecomment-480819952
 
 
   LGTM
   
   As a side note, I don't see aggregation tests verifying that aggregation 
works, because it always uses the input of a single row, and verifies that it 
doesn't change. I see there is `BeamSqlDslSqlStdOperatorsTest` that allows 
doing that. Can you fix that?
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 224314)
    Time Spent: 40m  (was: 0.5h)

> MAX/MIN(STRING)
> ---------------
>
>                 Key: BEAM-7010
>                 URL: https://issues.apache.org/jira/browse/BEAM-7010
>             Project: Beam
>          Issue Type: Improvement
>          Components: dsl-sql
>            Reporter: Rui Wang
>            Assignee: Rui Wang
>            Priority: Major
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> https://github.com/apache/beam/blob/master/sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/transform/BeamBuiltinAggregations.java#L108
> BeamSQL does not accept STRING as MIN/MAX's input parameter type.



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