improve performance for `apporx_distinct` when each group do no have many distinct value

[haohuaijin]

Is your feature request related to a problem or challenge?

when i do one test use below sql, i find the performance is not except

SELECT
  client_ip,
  approx_distinct(trace_id) AS cnt
FROM
  "*.parquet"
GROUP BY
  client_ip ORDER BY cnt DESC LIMIT 10

i have 100M rows, and 0.5 M unique client_ip
datafusli-cli need 900s to get the result, but duckdb only need 3s

Describe the solution you'd like

No response

Describe alternatives you've considered

No response

Additional context

No response

[haohuaijin]

take