mikhailnik-db opened a new pull request, #53487:
URL: https://github.com/apache/spark/pull/53487
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### What changes were proposed in this pull request?
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New implementation of `CTERelationRef.newInstance()` that preserves
attributes' names (see tests).
To control this small behavior change added the flag
`LEGACY_CTE_DUPLICATE_ATTRIBUTE_NAMES`.
### Why are the changes needed?
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The output schema is much more predictable and does not depend on query
shape.
### Does this PR introduce _any_ user-facing change?
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Yes, the column names case in the output schema has changed in case. Only
affects queries with CTE that have several attributes with the same exprId but
different names.
Example of current output of tests (without fix, after fix you can see in
golden files).
```
WITH cte AS (SELECT 1 AS id, 'test' AS COLNAME),
cte2 AS (SELECT id, COLNAME, colname FROM cte)
SELECT * FROM cte2 a JOIN cte2 b ON (a.id = b.id);
+---+-------+-------+---+-------+-------+
| id|COLNAME|colname| id|colname|colname|
+---+-------+-------+---+-------+-------+
| 1| test| test| 1| test| test|
+---+-------+-------+---+-------+-------+
WITH cte AS (SELECT 1 AS id, 'test' AS COLNAME),
cte2 AS (SELECT id, COLNAME, colname FROM cte),
cte3 AS (SELECT id, COLNAME, colname FROM cte2)
SELECT * FROM cte2 a JOIN cte2 b ON (a.id = b.id)
+---+-------+-------+---+-------+-------+
| id|colname|colname| id|colname|colname|
+---+-------+-------+---+-------+-------+
| 1| test| test| 1| test| test|
+---+-------+-------+---+-------+-------+
```
### How was this patch tested?
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New tests + existing tests
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Generated-by: Cursor 2.2.20
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