peter-toth opened a new pull request #28318:
URL: https://github.com/apache/spark/pull/28318
### What changes were proposed in this pull request?
This PR fixes a CTE substitution issue so as to the following SQL return the
correct empty result:
```
WITH t(c) AS (SELECT 1)
SELECT * FROM t
WHERE c IN (
WITH t(c) AS (SELECT 2)
SELECT * FROM t
)
```
Before this PR the result was `1`.
### Why are the changes needed?
To fix a correctness issue.
### Does this PR introduce any user-facing change?
Yes, fixes the correctness issue.
### How was this patch tested?
Added new test case.
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