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Transformations: Add support for an inner join transformation (#53865)

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Alex Karacaoglu
2022-08-18 10:22:45 -07:00
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docs/sources/panels/transform-data/transformation-functions.md
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@@ -568,3 +568,32 @@ Here is the result after adding a Limit transformation with a value of '3':
| 2020-07-07 11:34:20 | Temperature | 25 |
| 2020-07-07 11:34:20 | Humidity | 22 |
| 2020-07-07 10:32:20 | Humidity | 29 |
## Join by field (Inner join)
Use this transformation to combine the results from multiple queries (combining on a passed join field or the first time column) into one single result and drop rows where a successful join isn't able to occur - performing an inner join.
In the example below, we have two queries returning table data. It is visualized as two separate tables before applying the inner join transformation.
Query A:
| Time | Job | Uptime |
| ------------------- | ------- | --------- |
| 2020-07-07 11:34:20 | node | 25260122 |
| 2020-07-07 11:24:20 | postgre | 123001233 |
| 2020-07-07 11:14:20 | postgre | 345001233 |
Query B:
| Time | Server | Errors |
| ------------------- | -------- | ------ |
| 2020-07-07 11:34:20 | server 1 | 15 |
| 2020-07-07 11:24:20 | server 2 | 5 |
| 2020-07-07 11:04:20 | server 3 | 10 |
Result after applying the inner join transformation:
| Time | Job | Uptime | Server | Errors |
| ------------------- | ------- | --------- | -------- | ------ |
| 2020-07-07 11:34:20 | node | 25260122 | server 1 | 15 |
| 2020-07-07 11:24:20 | postgre | 123001233 | server 2 | 5 |