Lars Hofhansl created PHOENIX-6402:
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Summary: Allow using local indexes with uncovered columns in the
WHERE clause
Key: PHOENIX-6402
URL: https://issues.apache.org/jira/browse/PHOENIX-6402
Project: Phoenix
Issue Type: Improvement
Reporter: Lars Hofhansl
In PHOENIX-6400 I had to disable using local index when uncovered columns are
referenced in the WHERE clause.
There are two problems:
# The uncovered columns are represented as ProjectedColumnExpression and not
correctly added as filtered by the WhereCompiler
# The scanner produced in RegionScannerFactory.getWrappedScanner does not
handle this correctly.
[~kozdemir] and I brainstormed this today.
What should happen is this:
* Do add uncovered column expression as filters for local indexes (they would
not be evaluated at right time)
* Pass the extra filter expression via a scan attribute
* Do something similar to what we do with conditional expressions (see
PhoenixIndexBuilder.executeAtomicOp), where we assemble the complete tuple,
then run the filter expression over it.
This would probably require some surgery to filing it here as an Improvement in
case someone signs up for it :)
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