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https://issues.apache.org/jira/browse/CALCITE-1436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16236691#comment-16236691
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Julian Hyde commented on CALCITE-1436:
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Enumerable uses the volcano execution model i.e. one active thread per query;
bindable is capable of using one thread per operator, more suitable for
streaming queries.
> AggregateNode NPE for aggregators other than SUM/COUNT
> ------------------------------------------------------
>
> Key: CALCITE-1436
> URL: https://issues.apache.org/jira/browse/CALCITE-1436
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Gian Merlino
> Assignee: Julian Hyde
> Priority: Major
>
> AggregateNode.getAccumulator does this for any aggregation other than COUNT
> or SUM:
> final AggImpState agg = new AggImpState(0, call, false);
> int stateSize = agg.state.size();
> This NPEs because "state" is null on freshly created AggImpState instances.
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