kosiew commented on PR #22037:
URL: https://github.com/apache/datafusion/pull/22037#issuecomment-4441668912
@neilconway
I added
```
WITH RECURSIVE t(a, b) AS (
SELECT 0 AS a, 0 AS b
UNION ALL
SELECT b AS a, CAST(NULL AS INT) AS b FROM t WHERE a IS NOT NULL
)
SELECT * FROM t;
```
and also implemented `mark CTE columns as nullable`
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