What happened:
If a table has many rows, adding an adhoc query will execute the query
Select DISTINCT column FROM TABLE LIMIT 1000
This query can scan the entire table if there are fewer than 1000 values.
This issue has already been discussed in
#120
and even added the __adhocColumns macro
but it was later removed.

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

1. add adhoc filter by big table for column.

Screenshots

Anything else we need to know?:

Environment:

• Grafana version: 12.3.1
• Plugin version: 4.11.3
• OS Grafana is installed on: Ubuntu
• User OS & Browser: Chrome
• Others: