ywyg commented on issue #14485:
URL: https://github.com/apache/druid/issues/14485#issuecomment-1647715178
@abhishekagarwal87 ok. When I set `useApproximateCountDistinct=true` and
the native plan is
```
{
"queryType": "groupBy",
"dataSource": {
"type": "table",
"name": "inline_data"
},
"intervals": {
"type": "intervals",
"intervals": [
"-146136543-09-08T08:23:32.096Z/146140482-04-24T15:36:27.903Z"
]
},
"granularity": {
"type": "all"
},
"dimensions": [
{
"type": "default",
"dimension": "channel",
"outputName": "d0",
"outputType": "STRING"
}
],
"aggregations": [
{
"type": "grouping",
"name": "a0",
"groupings": [
"channel"
]
},
{
"type": "cardinality",
"name": "a1",
"fields": [
{
"type": "default",
"dimension": "page",
"outputName": "page",
"outputType": "STRING"
}
],
"byRow": false,
"round": true
}
],
"limitSpec": {
"type": "default",
"columns": [],
"limit": 1001
},
"subtotalsSpec": [
[
"d0"
],
[]
],
"context": {
"queryId": "edd6fd0b-885f-42fb-8d72-949633d5e066",
"sqlOuterLimit": 1001,
"sqlQueryId": "edd6fd0b-885f-42fb-8d72-949633d5e066",
"sqlTimeZone": "Asia/Shanghai",
"useApproximateCountDistinct": true,
"useGroupingSetForExactDistinct": true,
"useNativeQueryExplain": true
}
}
```
I can get index value , But when I set `useApproximateCountDistinct=false` ,
```
{
"queryType": "groupBy",
"dataSource": {
"type": "query",
"query": {
"queryType": "groupBy",
"dataSource": {
"type": "table",
"name": "inline_data"
},
"intervals": {
"type": "intervals",
"intervals": [
"-146136543-09-08T08:23:32.096Z/146140482-04-24T15:36:27.903Z"
]
},
"granularity": {
"type": "all"
},
"dimensions": [
{
"type": "default",
"dimension": "channel",
"outputName": "d0",
"outputType": "STRING"
},
{
"type": "default",
"dimension": "page",
"outputName": "d1",
"outputType": "STRING"
}
],
"aggregations": [
{
"type": "grouping",
"name": "a0",
"groupings": [
"channel"
]
},
{
"type": "grouping",
"name": "a1",
"groupings": [
"channel",
"page"
]
}
],
"limitSpec": {
"type": "NoopLimitSpec"
},
"subtotalsSpec": [
[
"d0",
"d1"
],
[
"d0"
]
],
"context": {
"queryId": "a08217d2-b262-4cad-98ad-5a6f1faaa446",
"sqlOuterLimit": 1001,
"sqlQueryId": "a08217d2-b262-4cad-98ad-5a6f1faaa446",
"sqlTimeZone": "Asia/Shanghai",
"useApproximateCountDistinct": false,
"useGroupingSetForExactDistinct": true,
"useNativeQueryExplain": true
}
}
},
"intervals": {
"type": "intervals",
"intervals": [
"-146136543-09-08T08:23:32.096Z/146140482-04-24T15:36:27.903Z"
]
},
"granularity": {
"type": "all"
},
"dimensions": [
{
"type": "default",
"dimension": "d0",
"outputName": "_d0",
"outputType": "STRING"
}
],
"aggregations": [
{
"type": "filtered",
"aggregator": {
"type": "longMin",
"name": "_a0",
"fieldName": "a0"
},
"filter": {
"type": "selector",
"dimension": "a1",
"value": "1"
},
"name": "_a0"
},
{
"type": "filtered",
"aggregator": {
"type": "count",
"name": "_a1"
},
"filter": {
"type": "and",
"fields": [
{
"type": "not",
"field": {
"type": "selector",
"dimension": "d1",
"value": null
}
},
{
"type": "selector",
"dimension": "a1",
"value": "0"
}
]
},
"name": "_a1"
}
],
"limitSpec": {
"type": "default",
"columns": [],
"limit": 1001
},
"subtotalsSpec": [
[
"_d0"
],
[]
],
"context": {
"queryId": "a08217d2-b262-4cad-98ad-5a6f1faaa446",
"sqlOuterLimit": 1001,
"sqlQueryId": "a08217d2-b262-4cad-98ad-5a6f1faaa446",
"sqlTimeZone": "Asia/Shanghai",
"useApproximateCountDistinct": false,
"useGroupingSetForExactDistinct": true,
"useNativeQueryExplain": true
}
}
```
The value of index all is 0. Looking forward to your reply
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