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https://issues.apache.org/jira/browse/PHOENIX-852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14117560#comment-14117560
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Maryann Xue commented on PHOENIX-852:
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Think the getSampleValue() itself has no problem, plus it also provides two
other signatures as "getSampleValue(maxLength, arrayLength)" and
"getSampleValue(maxLength)", in which "maxLength" is only useful for VARCHAR,
CHAR, VARBINARY, BINARY and their corresponding array types, and if not
specified we'll just give a default value "1". I just need to adjust my
PDataTypeTest.testGetSampleValue() to use the "toObject()" method with
parameter "maxLength".
> Optimize child/parent foreign key joins
> ---------------------------------------
>
> Key: PHOENIX-852
> URL: https://issues.apache.org/jira/browse/PHOENIX-852
> Project: Phoenix
> Issue Type: Improvement
> Reporter: James Taylor
> Assignee: Maryann Xue
> Attachments: 852-2.patch, 852-3.patch, 852.patch, PHOENIX-852.patch
>
>
> Often times a join will occur from a child to a parent. Our current algorithm
> would do a full scan of one side or the other. We can do much better than
> that if the HashCache contains the PK (or even part of the PK) from the table
> being joined to. In these cases, we should drive the second scan through a
> skip scan on the server side.
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