l1t1 commented on issue #1796:
URL:
https://github.com/apache/datafusion-python/issues/1796#issuecomment-6216013377
I got it, in `z.z`, datafusion regards the first z as a column, not a table,
following one is ok
```sql
WITH RECURSIVE
input(sud) AS (
VALUES('....754..........8.8.19....3....1.6........34....6817.2.4...6.39......2.53.2.....'),
('3.........5.7.3..8....28.7.7......43...........39.41.54..3..8..1...4....968...2..')
),
digits(z, lp) AS (
VALUES('1', 1)
UNION ALL SELECT
CAST(lp+1 AS TEXT) as z, lp+1 as lp FROM digits WHERE lp<9
),
x(s, ind) AS (
SELECT sud, instr(sud, '.') FROM input
UNION ALL
SELECT
substr(s, 1, ind-1) || z || substr(s, ind+1),
instr( substr(s, 1, ind-1) || z || substr(s, ind+1), '.' )
FROM x, digits AS d
WHERE ind>0
AND NOT EXISTS (
SELECT 1
FROM digits AS lp
WHERE d.z = substr(s, ((ind-1)/9)*9 + lp, 1)
OR d.z = substr(s, ((ind-1)%9) + (lp-1)*9 + 1, 1)
OR d.z = substr(s, (((ind-1)/3) % 3) * 3
+ ((ind-1)/27) * 27 + lp
+ ((lp-1) / 3) * 6, 1)
)
)
SELECT s FROM x WHERE ind=0;
```
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