[SPARK-40297][SQL] CTE outer reference nested in CTE main body cannot be resolved #37751
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|
cc @cloud-fan |
cloud-fan
approved these changes
Sep 1, 2022
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|
thanks, merging to master! |
Contributor
|
It has conflicts in 3.3, due to missing #36146 . @peter-toth can you help to open a backport PR for it? Thanks! |
Contributor
Sure, I can open it today or tomorrow. |
Contributor
|
@cloud-fan, here it is: #37760 |
cloud-fan
pushed a commit
that referenced
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Sep 6, 2022
… be resolved
This PR fixes a bug where a CTE reference cannot be resolved if this reference occurs in an inner CTE definition nested in the outer CTE's main body FROM clause. E.g.,
```
WITH cte_outer AS (
SELECT 1
)
SELECT * FROM (
WITH cte_inner AS (
SELECT * FROM cte_outer
)
SELECT * FROM cte_inner
)
```
This fix is to change the `CTESubstitution`'s traverse order from `resolveOperatorsUpWithPruning` to `resolveOperatorsDownWithPruning` and also to recursively call `traverseAndSubstituteCTE` for CTE main body.
Bug fix. Without the fix an `AnalysisException` would be thrown for CTE queries mentioned above.
No.
Added UTs.
Closes #37751 from maryannxue/spark-40297.
Authored-by: Maryann Xue <[email protected]>
Signed-off-by: Wenchen Fan <[email protected]>
Contributor
|
backported to 3.3 |
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What changes were proposed in this pull request?
This PR fixes a bug where a CTE reference cannot be resolved if this reference occurs in an inner CTE definition nested in the outer CTE's main body FROM clause. E.g.,
This fix is to change the
CTESubstitution's traverse order fromresolveOperatorsUpWithPruningtoresolveOperatorsDownWithPruningand also to recursively calltraverseAndSubstituteCTEfor CTE main body.Why are the changes needed?
Bug fix. Without the fix an
AnalysisExceptionwould be thrown for CTE queries mentioned above.Does this PR introduce any user-facing change?
No.
How was this patch tested?
Added UTs.