getChan commented on code in PR #13966:
URL: https://github.com/apache/datafusion/pull/13966#discussion_r1900393942
##########
datafusion/sqllogictest/test_files/array.slt:
##########
@@ -5674,6 +5674,13 @@ select array_distinct([sum(a)]) from t1 where a > 100
group by b;
statement ok
drop table t1;
+query ?
+select array_distinct(a) from values ([1, 2, 3]), (null), ([1, 3, 1]) as X(a);
+----
+[1, 2, 3]
+NULL
+[1, 3]
Review Comment:
Does this mean that `datafusion-cli -c select array_distinct(null);` should
also succeed?
It seems that `array_distinct` only accepts arguments of array type.
```
DataFusion CLI v44.0.0
Error: Error during planning: Error during planning: Failed to coerce
arguments to satisfy a call to array_distinct function: coercion from [Null] to
the signature ArraySignature(Array) failed. No function matches the given name
and argument types 'array_distinct(Null)'. You might need to add explicit type
casts.
Candidate functions:
array_distinct(array)
```
ref.
https://github.com/apache/datafusion/blob/aafec07e086463fc7ed72c704e9f7e367460618a/datafusion/functions-nested/src/set_ops.rs#L251
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