alamb commented on code in PR #12954:
URL: https://github.com/apache/datafusion/pull/12954#discussion_r1803496206
##########
datafusion/sqllogictest/test_files/metadata.slt:
##########
@@ -123,6 +123,19 @@ ORDER BY id, name, l_name;
NULL bar NULL
NULL NULL l_bar
+# Regression test: missing field metadata from left side of the union when
right side is chosen
Review Comment:
I verified that this query fails without the code changes in this PR:
```sql
External error: query failed: DataFusion error: Schema error: No field named
nonnull_name. Valid fields are table_with_metadata.id,
table_with_metadata.name, table_with_metadata.l_name.
[SQL] select name from (
SELECT nonnull_name as name FROM "table_with_metadata"
UNION ALL
SELECT NULL::string as name
) group by name order by name;
at test_files/metadata.slt:127
Error: Execution("1 failures")
error: test failed, to rerun pass `-p datafusion-sqllogictest --test
sqllogictests`
```
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