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https://issues.apache.org/jira/browse/CALCITE-1844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16050751#comment-16050751
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Julian Hyde commented on CALCITE-1844:
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I made it a Double because it is an estimate (in statistics it is an expected
value, i.e. an average). If you have two sources of estimates and one says 0
and the other says 1, then the best combined estimate is 0.5.
Also, using Double means we don't have to worry about overflowing 2^63.
Estimates that large are not as uncommon as you think.
> Statistic getRowCount() should return Long
> -------------------------------------------
>
> Key: CALCITE-1844
> URL: https://issues.apache.org/jira/browse/CALCITE-1844
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: darion yaphet
> Assignee: Julian Hyde
>
> Currently Statistic.getRowCount() return a double type data as the
> approximate number of rows in the table . It seems should be a Long type .
> And I found the row count is estimate value , use long type maybe better ?
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