snuyanzin commented on code in PR #26091:
URL: https://github.com/apache/flink/pull/26091#discussion_r1935889258
##########
docs/data/sql_functions.yml:
##########
@@ -256,7 +256,9 @@ arithmetic:
description: |
Returns the exact percentile value of expr at the specified percentage
in a group.
- percentage must be a literal numeric value between `[0.0, 1.0]` or an
array of such values.
+ E.g., SELECT PERCENTILE(age, 0.5) FROM (VALUES (0), (50), (100)) AS age
or $('age').percentile(0.5) returns 50.0.
+
+ The percentage must be a literal numeric value between `[0.0, 1.0]` or
an array of such values.
Review Comment:
I took me almost half an hour to realize that this is based on a continuous
distribution...
I think we need to think about other example here...
It returns same result for the case of 0.5 for both
however in case of discrete distribution
```sql
SELECT PERCENTILE(age, 0.25) FROM (VALUES (0), (25), (50), (100)) AS age
```
I would expect output 25.0 however it shows different result (since the
function is for continuous)
It should be explicitly mentioned in the doc since in SQL Standard there are
`PERCENTILE_CONT` and `PERCENTILE_DISC`.
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