Todd Lipcon created KUDU-2847:
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Summary: Optimize iteration over selection vector in
SerializeRowBlock
Key: KUDU-2847
URL: https://issues.apache.org/jira/browse/KUDU-2847
Project: Kudu
Issue Type: Improvement
Components: perf, tserver
Reporter: Todd Lipcon
Currently, SerializeRowBlock operates column-by-column, which means we have to
iterate over the selection bitmap once for each column. This code isn't
particularly well optimized -- in TPCH Q6, about 10% of CPU is spent in
BitmapFindFirst. We should look at alternate implementations here that better
amortize the bitmap iteration cost across all of the columns and generally
micro-optimize it.
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