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https://issues.apache.org/jira/browse/PHOENIX-4232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16179686#comment-16179686
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James Taylor commented on PHOENIX-4232:
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FYI, [~ohads].
> Hide shadow cell and commit table access in TAL
> -----------------------------------------------
>
> Key: PHOENIX-4232
> URL: https://issues.apache.org/jira/browse/PHOENIX-4232
> Project: Phoenix
> Issue Type: Bug
> Reporter: James Taylor
> Labels: omid
>
> Omid needs to project the shadow cell column qualifier and then based on the
> value, filter the row. If the shadow cell is not found, it needs to perform a
> lookup in the commit table (the source of truth) to get the information
> instead. For the Phoenix integration, there are likely two TAL methods that
> can be added to handle this:
> # Add method call to new TAL method in preScannerOpen call on coprocessor
> that projects the shadow cell qualifiers and sets the time range. This is
> equivalent to the TransactionProcessor.preScannerOpen that Tephra does. It's
> possible this work could be done on the client side as well, but it's more
> likely that the stuff that Phoenix does may override this (but we could get
> it to work if need be).
> # Add TAL method that returns a RegionScanner to abstract out the filtering
> of the row (potentially querying commit table). This RegionScanner would be
> added as the first in the chain in the
> NonAggregateRegionScannerFactory.getRegionScanner() API.
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