undo deletion of test in copy.slt

Author: Sergey Zhukov

datafusion/sqllogictest/test_files/copy.slt

@@ -538,6 +538,25 @@ select * from validate_arrow_file;
 1 Foo
 2 Bar
 
+# Copy from dict encoded values to single arrow file
+query I
+COPY (values 
+('c', arrow_cast('foo', 'Dictionary(Int32, Utf8)')), ('d', arrow_cast('bar', 'Dictionary(Int32, Utf8)'))) 
+to 'test_files/scratch/copy/table_dict.arrow' STORED AS ARROW;
+----
+2
+
+# Validate single csv output
+statement ok
+CREATE EXTERNAL TABLE validate_arrow_file_dict
+STORED AS arrow
+LOCATION 'test_files/scratch/copy/table_dict.arrow';
+
+query TT
+select * from validate_arrow_file_dict;
+----
+c foo
+d bar
 
 # Copy from table to folder of json
 query I