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From Clifford Resnick <cresn...@mediamath.com>
Subject KuduScanToken pushdown question
Date Fri, 21 Jul 2017 15:43:35 GMT
I’m playing with Drill’s kudu-storage code and converting it to use the ScanToken api.
It’s a fairly simple matter to do this by serializing ScanTokens (thanks of the great api!),
but I’m not sure how much to “push down” to Kudu. For Tablet/Drillbit affinity and for
pruning it’s clear I need to push hash key and range bounds predicates, but it can get a
bit tricky given that the ScanToken api does not support OR logic unless it fits into an IN_LIST
expression, so for more complex logic I suppose it’s best to not push down the filtering.
 However, I’m wondering if there is a way to push disjoint bounds to Kudu. For example,
if I have a table with range keys of Year,Month,Day, it there a way I can include only (2017,6,1)
OR (2017,5,5) in a group scan?

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