Vladimir Sitnikov created CALCITE-3708:
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Summary: Make VolcanoCost account cpu and io properties when
comparing costs
Key: CALCITE-3708
URL: https://issues.apache.org/jira/browse/CALCITE-3708
Project: Calcite
Issue Type: New Feature
Components: core
Affects Versions: 1.21.0
Reporter: Vladimir Sitnikov
Assignee: Vladimir Sitnikov
Currently, {{VolcanoCost}} compares {{rows}} only, which does not allow for
proper cost comparison of joins, projections, filters.
The idea is to use {{cpu + io * cpuPerIo}} calculation for comparison, and
ignore {{rows}} part.
{{cpuPerIo}} could be configured with
{{org.apache.calcite.config.CalciteConnectionConfig#volcanoCostIoPerCpu}} which
comes from {{volcanoCostIoPerCpu}} connection property and defatlts to
{{calcite.volcano.default.cpu_per_io}} system property.
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