v.25.6Improvement

Fix description

Fix description in explain plan for preliminary DISTINCT step. #80330 (UnamedRus).
Fixes the description of the preliminary DISTINCT step in the EXPLAIN query plan.

Why it matters

This update corrects the textual description in EXPLAIN plans related to the preliminary DISTINCT operation, improving clarity and accuracy for users analyzing query execution.

How to use it

No user action is needed; the fix is applied automatically with the update and will be visible when running EXPLAIN on queries using DISTINCT.