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https://issues.apache.org/jira/browse/PHOENIX-940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13987345#comment-13987345
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James Taylor commented on PHOENIX-940:
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So you'd like to be able to add to the PK for a VIEW, right? The reason is that
you don't want the row with the same entity_id to be updated again and again,
but you'd rather maintain all of those versions as independent/separate rows.
Is that correct, [~elilevine]?
> Unique Constraint
> -----------------
>
> Key: PHOENIX-940
> URL: https://issues.apache.org/jira/browse/PHOENIX-940
> Project: Phoenix
> Issue Type: New Feature
> Reporter: Eli Levine
>
> Add support for UNIQUE constraint on one or more columns in CREATE and ALTER
> TABLE statements:
> {code}
> CONSTRAINT constraint_name UNIQUE (column1, column2, . column_n)
> {code}
> One possible way to implement this is by adding a secondary index on columns
> involved in the constraint and adding a check for column values before upsert.
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