KenanAdel commented on code in PR #28456:
URL: https://github.com/apache/flink/pull/28456#discussion_r3419958123
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docs/data/sql_functions.yml:
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@@ -1611,6 +1611,16 @@ aggregate:
`(NUMERIC: INTEGER_NUMERIC, FLOAT, DOUBLE, DECIMAL)`
Returns a `DOUBLE` if percentage is numeric, or an `ARRAY<DOUBLE>` if
percentage is an array. `NULL` if percentage is an empty array.
+ - sql: SINGLE_VALUE(expression)
+ description: |
+ Returns a single value of the expression within a group.
+
+ If the group contains more than one distinct value, an exception is
thrown at runtime.
+
+ E.g., SELECT SINGLE_VALUE(id) FROM T.
Review Comment:
Thanks for the explanation and the clear example! I've updated the
documentation to include the correct example with the `GROUP BY` clause. I
applied this fix to both the English and Chinese documentation files.
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