Added clarifying comment for array_type mixed return types

Signed-off-by: anindyam1969 <amukherjee@kinetica.com>

Author: am-kinetica

python/ray/data/_internal/datasource/kinetica_type_utils.py

@@ -327,6 +327,8 @@ def kinetica_to_arrow_type(column: Any) -> "pa.DataType":
         return pa.string()
 
     # Array
+    # Note: column.array_type returns _ColumnType constants for int/long/float/
+    # double/string, but GPUdbColumnProperty strings for boolean/ulong.
     if column.is_array():
         array_type = column.array_type
         if array_type == GPUdbRecordColumn._ColumnType.INT: