Todd Lipcon created KUDU-2854:
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Summary: Short circuit predicates on dictionary-coded columns
Key: KUDU-2854
URL: https://issues.apache.org/jira/browse/KUDU-2854
Project: Kudu
Issue Type: Improvement
Components: cfile, perf, tserver
Reporter: Todd Lipcon
In the common case that a column has no updates in a given DRS, if we see that
no entries in the dictionary match the predicate, we can short circuit at a few
layers:
- we can store a flag in the cfile footer that indicates that all blocks are
dict-coded (ie there are no fallbacks). In that case, we can skip the whole
rowset
- if a cfile is partially dict-encoded, we can skip any dict-coded blocks
without decoding the dictionary words
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