meshari343 opened a new issue, #13833:
URL: https://github.com/apache/pinot/issues/13833
hello, I have noticed that DISTINCTCOUNT and percentile doesn't utilize
indexes to filter data.
below are the queries and their plan, based on the quick start airline
dataset:
1- DISTINCTCOUNT query:
select DISTINCTCOUNT(Cancelled) from airlineStats where Origin = 'ATL'
plan:
"resultTable": {
"dataSchema": {
"columnNames": [
"Operator",
"Operator_Id",
"Parent_Id"
],
"columnDataTypes": [
"STRING",
"INT",
"INT"
]
},
"rows": [
[
"BROKER_REDUCE(limit:10)",
1,
0
],
[
"COMBINE_AGGREGATE",
2,
1
],
[
"PLAN_START(numSegmentsForThisPlan:31)",
-1,
-1
],
[
"AGGREGATE(aggregations:distinctCount(Cancelled))",
3,
2
],
[
"PROJECT(Cancelled)",
4,
3
],
[
"DOC_ID_SET",
5,
4
],
[
"FILTER_FULL_SCAN(operator:EQ,predicate:Origin = 'ATL')",
6,
5
]
]
}
query response stats:
"requestId": "93259971000000019",
"brokerId": "Broker_172.17.0.2_8000",
"exceptions": [],
"numServersQueried": 1,
"numServersResponded": 1,
"numSegmentsQueried": 31,
"numSegmentsProcessed": 31,
"numSegmentsMatched": 31,
"numConsumingSegmentsQueried": 0,
"numConsumingSegmentsProcessed": 0,
"numConsumingSegmentsMatched": 0,
"numDocsScanned": 629,
"numEntriesScannedInFilter": 9746,
"numEntriesScannedPostFilter": 629,
"numGroupsLimitReached": false,
"totalDocs": 9746,
"timeUsedMs": 10,
"offlineThreadCpuTimeNs": 0,
"realtimeThreadCpuTimeNs": 0,
"offlineSystemActivitiesCpuTimeNs": 0,
"realtimeSystemActivitiesCpuTimeNs": 0,
"offlineResponseSerializationCpuTimeNs": 0,
"realtimeResponseSerializationCpuTimeNs": 0,
"offlineTotalCpuTimeNs": 0,
"realtimeTotalCpuTimeNs": 0,
"brokerReduceTimeMs": 0,
"segmentStatistics": [],
"traceInfo": {},
"minConsumingFreshnessTimeMs": 0,
"numRowsResultSet": 1,
"numSegmentsPrunedByBroker": 0,
"numSegmentsPrunedByServer": 0,
"numSegmentsPrunedInvalid": 0,
"numSegmentsPrunedByLimit": 0,
"numSegmentsPrunedByValue": 0,
"explainPlanNumEmptyFilterSegments": 0,
"explainPlanNumMatchAllFilterSegments": 0
2-percentile query:
select percentile(AirTime, 50) from airlineStats where Origin = 'ATL'
plan:
"resultTable": {
"dataSchema": {
"columnNames": [
"Operator",
"Operator_Id",
"Parent_Id"
],
"columnDataTypes": [
"STRING",
"INT",
"INT"
]
},
"rows": [
[
"BROKER_REDUCE(limit:10)",
1,
0
],
[
"COMBINE_AGGREGATE",
2,
1
],
[
"PLAN_START(numSegmentsForThisPlan:31)",
-1,
-1
],
[
"AGGREGATE(aggregations:percentile(AirTime))",
3,
2
],
[
"PROJECT(AirTime)",
4,
3
],
[
"DOC_ID_SET",
5,
4
],
[
"FILTER_FULL_SCAN(operator:EQ,predicate:Origin = 'ATL')",
6,
5
]
]
}
query response stats:
"requestId": "93259971000000018",
"brokerId": "Broker_172.17.0.2_8000",
"exceptions": [],
"numServersQueried": 1,
"numServersResponded": 1,
"numSegmentsQueried": 31,
"numSegmentsProcessed": 31,
"numSegmentsMatched": 31,
"numConsumingSegmentsQueried": 0,
"numConsumingSegmentsProcessed": 0,
"numConsumingSegmentsMatched": 0,
"numDocsScanned": 629,
"numEntriesScannedInFilter": 9746,
"numEntriesScannedPostFilter": 629,
"numGroupsLimitReached": false,
"totalDocs": 9746,
"timeUsedMs": 10,
"offlineThreadCpuTimeNs": 0,
"realtimeThreadCpuTimeNs": 0,
"offlineSystemActivitiesCpuTimeNs": 0,
"realtimeSystemActivitiesCpuTimeNs": 0,
"offlineResponseSerializationCpuTimeNs": 0,
"realtimeResponseSerializationCpuTimeNs": 0,
"offlineTotalCpuTimeNs": 0,
"realtimeTotalCpuTimeNs": 0,
"brokerReduceTimeMs": 0,
"segmentStatistics": [],
"traceInfo": {},
"minConsumingFreshnessTimeMs": 0,
"numRowsResultSet": 1,
"numSegmentsPrunedByBroker": 0,
"numSegmentsPrunedByServer": 0,
"numSegmentsPrunedInvalid": 0,
"numSegmentsPrunedByLimit": 0,
"numSegmentsPrunedByValue": 0,
"explainPlanNumEmptyFilterSegments": 0,
"explainPlanNumMatchAllFilterSegments": 0
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