YiwenWu commented on code in PR #3846:
URL: https://github.com/apache/calcite/pull/3846#discussion_r1667904970
##########
core/src/main/java/org/apache/calcite/sql/fun/SqlLibraryOperators.java:
##########
@@ -1089,6 +1090,25 @@ static RelDataType deriveTypeSplit(SqlOperatorBinding
operatorBinding,
SqlFunctionCategory.STRING)
.withOperandTypeInference(InferTypes.RETURN_TYPE);
+ /** The "CONCAT_WS(separator, arg1, ...)" function (Postgres).
+ *
+ * <p>Differs from {@link #CONCAT_WS} (MySQL) in that its arg1 can be of any
type,
+ * not limited to string. For example:
+ *
+ * <ul>
+ * <li>{@code CONCAT_WS(',', 'a')} returns "{@code a}";
Review Comment:
@NobiGo Yes, it's handled differently. Spark will append each element of the
array, Postgres directly toString and then append.
Spark：
```
select concat_ws(',',ARRAY[1000, 2000]);
1000,2000
```
Postgres：
```
select concat_ws(',',ARRAY[1000, 2000]);
{10000,2000}
```
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