James Taylor created PHOENIX-4232:
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Summary: 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
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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