ostinru opened a new pull request, #163:
URL: https://github.com/apache/cloudberry-pxf/pull/163

   ## Summary
   
   - Replace the unavailable MinIO test sidecar with the official RustFS 1.0.0 
image, pinned by digest.
   - Update S3 Testcontainers configuration, fixture seeding, and cloud access 
error expectations.
   
   ### S3 Select SQL compatibility
   
   PXF emits `null` placeholders for unprojected columns to keep the external 
table's column positions intact. RustFS 1.0.0 returns `InvalidQuery` when the 
SELECT list contains multiple identical `null` expressions. Give each 
placeholder a distinct alias, such as `null AS pxf_unused_3`, while preserving 
its value and position. The alias syntax is supported by Amazon S3 Select and 
the resulting queries were checked against RustFS with the committed CSV and 
Parquet fixtures.
   
   ### FDW Tests
   
   Run S3 Select scenarios in FDW mode as well.


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