yashmayya opened a new pull request, #13555:
URL: https://github.com/apache/pinot/pull/13555
- A query like `SELECT Origin, SUM(ArrDelay) FROM mytable GROUP BY Origin
LIMIT 0` was resulting in the error:
```
QueryExecutionError:
java.lang.IllegalArgumentException: Result size can't be negative
at
com.google.common.base.Preconditions.checkArgument(Preconditions.java:145)
at
org.apache.pinot.core.data.table.IndexedTable.<init>(IndexedTable.java:74)
at
org.apache.pinot.core.data.table.ConcurrentIndexedTable.<init>(ConcurrentIndexedTable.java:42)
at
org.apache.pinot.core.data.table.ConcurrentIndexedTable.<init>(ConcurrentIndexedTable.java:37)
```
- This check was added recently in
https://github.com/apache/pinot/pull/13514 to ensure that an integer overflow
check doesn't become error prone due to negative values (also the negative
values don't make sense for result size / trim size / trim threshold).
- However, one thing that was missed is that the result size / trim size can
be 0 for aggregation queries using group by when the limit is zero -
https://github.com/apache/pinot/blob/cf1a0f6b9b44fdb567452b63a34e76ac5c635429/pinot-core/src/main/java/org/apache/pinot/core/operator/streaming/StreamingGroupByCombineOperator.java#L94
- This was surfaced by the
[testGeneratedQueries](https://github.com/apache/pinot/blob/cf1a0f6b9b44fdb567452b63a34e76ac5c635429/pinot-integration-tests/src/test/java/org/apache/pinot/integration/tests/BaseClusterIntegrationTestSet.java#L480)
becoming a flaky test in recent CI runs. The test can randomly generate group
by aggregation queries with zero limits -
https://github.com/apache/pinot/blob/cf1a0f6b9b44fdb567452b63a34e76ac5c635429/pinot-integration-test-base/src/test/java/org/apache/pinot/integration/tests/QueryGenerator.java#L862
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