alamb commented on PR #21988:
URL: https://github.com/apache/datafusion/pull/21988#issuecomment-4373442428
I spot checked duckdb and postgres and agree with your analysis.
```sql
memory D create table foo(x int);
memory D insert into foo values (1), (2), (1), (3), (1);
memory D select median(x) from foo;
┌───────────┐
│ median(x) │
│ double │
├───────────┤
│ 1.0 │
└───────────┘
```
```sql
postgres=# select percentile_cont(0.5) WITHIN GROUP (ORDER BY x) from foo;
percentile_cont
-----------------
1
(1 row)
postgres=# select pg_typeof(percentile_cont(0.5) WITHIN GROUP (ORDER BY x))
from foo;
pg_typeof
------------------
double precision
(1 row)
```
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