[CALCITE-1436] AggregateNode NPE for aggregators other than SUM/COUNT - ASF JIRA

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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.

Blocked

CALCITE-2228 An inevitable NPE while using MAX aggregation function

is depended upon by

CALCITE-1805 Druid adapter incorrectly pushes down "COUNT(c)"; Druid only supports "COUNT(*)"

is duplicated by

CALCITE-1437 AggregateNode NPE for aggregators other than SUM/COUNT

CALCITE-1687 NPE in AggregateNode.getAccumulator

is related to

CALCITE-1706 DruidAggregateFilterTransposeRule causes very fine-grained aggregations to be pushed to Druid