Fix doc_count on HistoBackedHistogramAggregator #74650
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csoulios
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nik9000
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Jun 28, 2021
benwtrent
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Jun 28, 2021
| // We have added the document already and we have incremented bucket doc_count | ||
| // by _doc_count times. To compensate for this, we should increment doc_count by | ||
| // (count - _doc_count) so that we have added it count times. | ||
| incrementBucketDocCount(bucketOrd, count - docCountProvider.getDocCount(doc)); |
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No matter what _doc_count is, it was previously added to the bucket_count via the collectBucket methods. It could be ANY number.
Consequently, this incrementBucketDocCount may actually be decrementing the bucket_count to adjust for the difference.
I think this is fine.
The other potential solution is to override collectBucket... so the bucket count is not incremented. But that may prove too complicated.
I think this is good solution for now 👍
Somebody else from the aggs team should take a look as well.
This was referenced Jun 28, 2021
csoulios
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Jun 29, 2021
Backports #74650 to v7.x histogram aggregation on histogram field computes wrong doc_count values when _doc_count field is present. The root cause of the problem is correctly described here
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histogramaggregation onhistogramfield computes wrongdoc_countvalues when_doc_countfield is present.The root cause of the problem is correctly described here
Closes #74617