Feat : add export to "Explore by" table

[f-teyssier]

The "Explore by" table is accessed with a right click on some visualized datas from a graph, then a table of filtered datas is displayed.
It would be convenient to be able to export this table to a csv or excel file for a user !
The idea could be to add a sandwich button on the right upper corner to select the export type ? The file should be named with current date, filters applyed and graph name : <graph_name>-<date>-filteredBy-<filters>

[manimovassagh]

This would be a really useful addition. Right now if you need to export the drillthrough data, there are a couple of workarounds:

1. Copy-paste -- Select the table contents in the modal, copy, and paste into a spreadsheet. Clunky but works in a pinch.

2. Use the Chart Data API -- Hit the REST API directly with the same filters applied. For example:

   curl -X POST "https://your-superset/api/v1/chart/data" \
     -H "Authorization: Bearer <token>" \
     -H "Content-Type: application/json" \
     -d '{"datasource":{"id":1,"type":"table"},"queries":[{"filters":[{"col":"your_column","op":"==","val":"filtered_value"}]}]}'

   Then save the JSON response or pipe it through jq into CSV.

3. Build a dedicated drillthrough dashboard -- Create a separate Table chart with the same dataset, add the relevant filters as dashboard-level filters, and use that for exports (Table charts support CSV/Excel download natively).

For the feature request itself, if anyone wants to contribute this, the modal lives in superset-frontend/src/components/Chart/DrillDetail/ -- the DrillDetailPane component renders the table. Adding an export button there that calls the existing exportChart utility would be the cleanest path. The filename convention you suggested (<graph_name>-<date>-filteredBy-<filters>) makes a lot of sense.

Worth filing a proper feature request issue if one does not exist already so it gets tracked on the roadmap.