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https://issues.apache.org/jira/browse/CALCITE-5105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde reassigned CALCITE-5105:
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Assignee: Julian Hyde
> Add MEASURE type and AGGREGATE aggregate function
> -------------------------------------------------
>
> Key: CALCITE-5105
> URL: https://issues.apache.org/jira/browse/CALCITE-5105
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Priority: Major
>
> In CALCITE-4496 we propose adding measures to SQL, and an "AS MEASURE"
> sub-clause to the SELECT clause so that you can define measures. This change
> is a first step in that direction: namely the ability to define the columns
> are measures and use validate queries that use measures.
> This change adds a {{MEASURE}} type, which is parameterized with the value
> type, so that in RelNode-and-RexNode-land a measure column whose value is of
> type {{INTEGER}} would have type {{MEASURE<INTEGER>}}. (In SqlNode-land its
> type would be {{INTEGER}} and we would tell that it was a measure by some
> other means.)
> This change also adds an aggregate function called {{AGGREGATE}} that
> evaluates measures in the current {{GROUP BY}} context. (You can think of
> this as letting the measures roll themselves up as only they know how. For
> example, if the {{sum_price}} measure is defined as {{SUM(price)}} then if I
> write {{AGGREGATE(sum_price)}} in my query it's as if I wrote {{SUM(price)}}.
> But we also support measures that have more complex formulas.)
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