Vladimir Sitnikov created CALCITE-4558:
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Summary: Sort CPU cost should be aligned with filter and project:
sort should incur row copy cost
Key: CALCITE-4558
URL: https://issues.apache.org/jira/browse/CALCITE-4558
Project: Calcite
Issue Type: Improvement
Components: core
Affects Versions: 1.26.0
Reporter: Vladimir Sitnikov
Typical Java implementations of the sort do not copy rows (they copy references
only), so
it makes little sense to have "row width" as the key driver of the sort costing.
The CPU cost for filter does not include "row copy" cost.
Even though the implementations might be different, in-core costs should be
aligned.
For instance, the current, EnumerableLimitSort and EnumerableSort have
bytesPerRow multiplier, however, the implementation does not copy rows
field-by-field .
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