odajun opened a new issue #10859:
URL: https://github.com/apache/druid/issues/10859
The map implementation no longer converts empty characters, after the update
from 0.20.0 to 0.20.1
### Affected Version
0.20.1
### Description
In our environment, the results of the following queries changed before and
after the upgrade.
```
{
"queryType": "topN",
"dataSource": "data_source_name",
"intervals": ["2018-01-07T15:00:00.000Z/2018-01-14T15:00:00.000Z"],
"granularity": "all",
"aggregations": [{"type": "longSum", "name": "value", "fieldName":
"field_name"}],
"dimension": {
"type": "extraction", "dimension": "dimension", "outputName":
"output_name", "outputType": "STRING",
"extractionFn": {
"type": "lookup",
"lookup": {
"type": "map",
"map": { "", "(empty set)"},
"isOneToOne": false
},
"retainMissingValue": true,
"replaceMissingValueWith": null
}
},
"threshold": 3,
"metric": "value",
"segments": []
}
```
expected result
| output_name| value |
| ---- | ---- |
| (empty set) | 10000 |
| aaa | 9000 |
| bbb | 8000 |
actual result
| output_name| value |
| ---- | ---- |
| null | 10000 |
| aaa | 9000 |
| bbb | 8000 |
We think the cause is known to be due to the following update.
https://github.com/apache/druid/commit/ae4b1920c53d34008ab55cfa2e368a8affad77a0#diff-a6471b0e75ec5f881cceafb6186[…]e04e6fe4e8a1fca21674bf9a5R64-R112
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