villebro edited a comment on issue #14709:
URL: https://github.com/apache/superset/issues/14709#issuecomment-844101647
Something quite similar is already being leveraged in a few plugins,
although in a slightly different context. As you may know, it's possible to
fetch results for multiple queries in a single query context in `buildQuery`:
```
queryContext = {
queries: [
queryObject1,
queryObject2,
],
}
```
Now, to be able to add more query objects based on chart interaction you can
call `setDataMask` and pass it a JSON object called `ownState`. Something like
this:
`setDataMask({ ownState: ['node1'] });`
When you do that, `buildQuery` is retriggered, and you are able to access
the `ownState` object in buildQuery like this:
```ts
export default function buildQuery(formData, options) {
const { ownState } = options; // ['node1']
...
}
```
So anything that you've passed to `ownState` can be used to modify or add
queries to the query context.
If you want to take it one step further, you can even reference another
dataset by specifying different `datasource` in the query object than in the
query object. However, this hasn't really been used that much yet (no proper UI
support exists yet), but I believe we have a unit test in the backend testing
that it should work.
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