jayzhan211 commented on code in PR #9679:
URL: https://github.com/apache/arrow-datafusion/pull/9679#discussion_r1529511702
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datafusion/sqllogictest/test_files/dictionary.slt:
##########
@@ -280,3 +280,70 @@ ORDER BY
2023-12-20T01:20:00 1000 f2 foo
2023-12-20T01:30:00 1000 f1 32.0
2023-12-20T01:30:00 1000 f2 foo
+
+# Cleanup
+statement error DataFusion error: Execution error: Table 'm1' doesn't exist\.
+drop table m1;
+
+statement error DataFusion error: Execution error: Table 'm2' doesn't exist\.
+drop table m2;
+
+######
+# Create a table using UNION ALL to get 2 partitions (very important)
+######
+statement ok
+create table m3_source as
+ select * from (values('foo', 'bar', 1))
+ UNION ALL
+ select * from (values('foo', 'baz', 1));
+
+######
+# Now, create a table with the same data, but column2 has type
`Dictionary(Int32)` to trigger the fallback code
Review Comment:
why does the cast to the dictionary trigger the fallback code? Does it refer
to `merge_batch`?
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