On 2014-01-03 05:24, Felix Xu wrote:
Hi,
Cardinality estimation is a widely used technique in databases for selecting
the best execution plan, is there any
implementation in H2 ? I'm also wondering how does the table statistics data
used in H2? I want to get the estimated row
numbers of the output dataset of each operator(join/group by etc.) in a query,
which part of code should I get started with?
We currently only do very basic selectivity estimation.
The relevant code lives in
org.h2.command.ddl.Analyze
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