wankunde opened a new pull request, #39460:
URL: https://github.com/apache/spark/pull/39460
### What changes were proposed in this pull request?
Makes DPP support the pruning side has `Union`. For example:
```sql
SELECT f.store_id,
f.date_id,
s.state_province
FROM (SELECT 4 AS store_id,
date_id,
product_id
FROM fact_sk
WHERE date_id >= 1300
UNION ALL
SELECT store_id,
date_id,
product_id
FROM fact_stats
WHERE date_id <= 1000) f
JOIN dim_store s
ON f.store_id = s.store_id
WHERE s.country IN ('US', 'NL')
```
After this PR:
### Why are the changes needed?
Improve query performance.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Unit test.
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