hanyuzheng7 commented on code in PR #22951:
URL: https://github.com/apache/flink/pull/22951#discussion_r1486986597
##########
flink-table/flink-table-common/src/main/java/org/apache/flink/table/functions/BuiltInFunctionDefinitions.java:
##########
@@ -231,6 +232,21 @@ ANY, and(logical(LogicalTypeRoot.BOOLEAN), LITERAL)
"org.apache.flink.table.runtime.functions.scalar.ArrayContainsFunction")
.build();
+ public static final BuiltInFunctionDefinition ARRAY_SORT =
+ BuiltInFunctionDefinition.newBuilder()
+ .name("ARRAY_SORT")
+ .kind(SCALAR)
+ .inputTypeStrategy(
+ or(
+ sequence(new
ArrayComparableElementArgumentTypeStrategy()),
+ sequence(
+ new
ArrayComparableElementArgumentTypeStrategy(),
+ logical(LogicalTypeRoot.BOOLEAN))))
Review Comment:
SQL Server: Uses the ORDER BY clause for sorting based on column names,
supporting ascending or descending order. Does not have native array types but
allows sorting through table variables or temporary tables.
SQLite: Similar to SQL Server, it relies on ORDER BY for sorting without
built-in array support.
PostgreSQL: Supports arrays and provides functions like array_sort for
direct sorting of array elements.
For postgresql https://www.postgresql.org/docs/8.4/intarray.html
it has four ways to sort an array
```
sort(int[], text dir) | int[] | sort array — dir must be asc or desc |
sort('{1,2,3}'::int[], 'desc') | {3,2,1}
sort(int[]) | int[] | sort in ascending order | sort(array[11,77,44]) |
{11,44,77}
sort_asc(int[]) | int[] | sort in ascending order | |
sort_desc(int[]) | int[] | sort in descending order |
```
MySQL & MariaDB: Lack built-in array support; sorting is achieved using
ORDER BY.
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