viiccwen opened a new issue, #1184:
URL: https://github.com/apache/mahout/issues/1184

   ref: #1058 
   
   ### What
   
   Add direct tests for `qdp/qdp-core/src/readers/parquet.rs`.
   
   Current coverage for this file is still zero:
   
   - Function coverage: `0.00% (0/31)`
   - Line coverage: `0.00% (0/415)`
   
   ### Why
   
   We already have `qdp/qdp-core/tests/parquet_io.rs`, but those tests mainly 
exercise `io.rs` helper functions. The actual `ParquetReader` and 
`ParquetStreamingReader` implementations remain uncovered.
   
   This is a large and important blind spot in the current Rust coverage report.
   
   ### How
   
   Add tests that instantiate the reader types directly and exercise both batch 
and streaming behavior.
   
   Suggested coverage targets:
   
   - `ParquetReader::new()` rejects missing files and bad schemas
   - `ParquetReader::read_batch()` handles `List<Float64>`
   - `ParquetReader::read_batch()` handles `FixedSizeList<Float64>`
   - reject inconsistent sample sizes across rows
   - `ParquetStreamingReader::new()` accepts scalar `Float64` for basis encoding
   - `ParquetStreamingReader` returns chunked data and sample-size metadata 
correctly
   - assert empty-file or no-data behavior explicitly
   
   This issue is done when `readers/parquet.rs` is no longer at 0% coverage and 
existing Parquet tests still pass.
   


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