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https://issues.apache.org/jira/browse/PHOENIX-5629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17019892#comment-17019892
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Lars Hofhansl commented on PHOENIX-5629:
----------------------------------------

They are concatenated only for immutable tables and only if 
IMMUTABLE_STORAGE_SCHEME = ONE_CELL_PER_COLUMN.

In all other cases we have a Cell per column.

> Phoenix Function to Return HBase Timestamp of Column Cell
> ---------------------------------------------------------
>
>                 Key: PHOENIX-5629
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-5629
>             Project: Phoenix
>          Issue Type: New Feature
>            Reporter: Geoffrey Jacoby
>            Assignee: Tanuj Khurana
>            Priority: Major
>             Fix For: 5.1.0, 4.16.0
>
>
> t's occasionally useful when diagnosing an issue with Phoenix to be able to 
> easily look up the HBase timestamp of the HBase Cell returned by a Phoenix 
> query. 
> For example:
> SELECT ROW_TIMESTAMP(Column1) FROM Table1 WHERE Column1 = 'SomeValue'



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