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https://issues.apache.org/jira/browse/PHOENIX-2896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15849136#comment-15849136
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Samarth Jain commented on PHOENIX-2896:
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I almost forgot why we wanted to have a single counter for mutable tables. So
for my own memory and for others who might be interested: for mutable tables,
in cases of ORDER BY and GROUP BY on key value columns, we use the
EncodedColumnQualifierCellsList where each column qualifier has a unique place.
By using a single counter, we can guarantee that all column qualifiers are
unique across all the column families.
> Support encoded column qualifiers per column family
> ----------------------------------------------------
>
> Key: PHOENIX-2896
> URL: https://issues.apache.org/jira/browse/PHOENIX-2896
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: Thomas D'Silva
> Assignee: Samarth Jain
> Fix For: 4.10.0
>
>
> This allows us to reduce the number of null values in the stored array that
> contains all columns for a give column family for the
> COLUMNS_STORED_IN_SINGLE_CELL Storage Scheme.
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