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https://issues.apache.org/jira/browse/IGNITE-21721?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Orlov updated IGNITE-21721:
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Description:
Scan over an index if significantly slower than scan over a table. In some
cases (for example, TPC-H q1 on scaleFactor=0.1) it's faster to read an entire
table and do sorting in memory rather than scan the index.
Let's adjust cost function to reflect the real complexity of index scan.
was:
Scan over an index if significantly slower than scan over a table. In some
cases (for example, TPC-H q4 on scaleFactor=0.1) it's faster to read an entire
table and do sorting in memory rather than scan the index.
Let's adjust cost function to reflect the real complexity of index scan.
> Sql. Adjust cost estimation for index scan
> ------------------------------------------
>
> Key: IGNITE-21721
> URL: https://issues.apache.org/jira/browse/IGNITE-21721
> Project: Ignite
> Issue Type: Improvement
> Components: sql
> Reporter: Konstantin Orlov
> Assignee: Konstantin Orlov
> Priority: Major
> Labels: ignite-3
>
> Scan over an index if significantly slower than scan over a table. In some
> cases (for example, TPC-H q1 on scaleFactor=0.1) it's faster to read an
> entire table and do sorting in memory rather than scan the index.
> Let's adjust cost function to reflect the real complexity of index scan.
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