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https://issues.apache.org/jira/browse/PHOENIX-258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15300657#comment-15300657
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Lars Hofhansl commented on PHOENIX-258:
---------------------------------------
I'll attempt a combined patch. Should be just using a RowSchema iterator and
calling next once with position=0 and extraSpan of the length of the distinct
prefix of the row key. That would match the current key, which I can then
increment in the filter.
> Use skip scan when SELECT DISTINCT on leading row key column(s)
> ---------------------------------------------------------------
>
> Key: PHOENIX-258
> URL: https://issues.apache.org/jira/browse/PHOENIX-258
> Project: Phoenix
> Issue Type: Task
> Reporter: ryang-sfdc
> Labels: gsoc2016
> Fix For: 4.8.0
>
> Attachments: 258.txt, DistinctFixedPrefixFilter.java
>
>
> create table(a varchar(32) not null, date date not null constraint pk primary
> key(a,date))
> [["PLAN"],["CLIENT PARALLEL 94-WAY FULL SCAN OVER foo"],[" SERVER
> AGGREGATE INTO ORDERED DISTINCT ROWS BY [a]"],["CLIENT MERGE SORT"]]
>
> We should skip scan.
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