[jira] [Created] (ARROW-14047) FileReader returns inconsistent results on repeat reads

["Radu Teodorescu (Jira)" <ji...@apache.org>]

Radu Teodorescu created ARROW-14047:
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             Summary: FileReader returns inconsistent results on repeat reads
                 Key: ARROW-14047
                 URL: https://issues.apache.org/jira/browse/ARROW-14047
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
    Affects Versions: 5.0.0
         Environment: Centos 7 gcc 9.2.0
            Reporter: Radu Teodorescu
         Attachments: Capture.PNG, writeReadRowGroup.parquet

We are seeing that for certain data sets when dealing with lists of structs, repeated reads yield different results - I have a file that exhibits this behavior and below is the code for reproducing it:
{code:java}
  filesystem::path filePath = dirPath / "writeReadRowGroup.parquet";
  arrow::MemoryPool *pool = arrow::default_memory_pool();  std::shared_ptr<arrow::io::ReadableFile> infile;
  PARQUET_ASSIGN_OR_THROW(infile, arrow::io::ReadableFile::Open(filePath, pool));
  std::unique_ptr<parquet::arrow::FileReader> arrow_reader;
  auto status = parquet::arrow::OpenFile(infile, pool, &arrow_reader);
  CHECK_OK(status);  std::shared_ptr<arrow::Schema> readSchema;
  CHECK_OK(arrow_reader->GetSchema(&readSchema));
  std::shared_ptr<arrow::Table> table;
  std::vector<int> indicesToGet;
  CHECK_OK(arrow_reader->ReadTable(&table));  auto recordListCol1 = arrow::Table::Make(arrow::schema({table->schema()->GetFieldByName("recordList")}),
                                           {table->GetColumnByName("recordList")});  for (int i = 0; i < 20; ++i) {
    cout << "data reread operation number = " + std::to_string(i) << endl;
    std::shared_ptr<arrow::Table> table2;
    CHECK_OK(arrow_reader->ReadTable(&table2));
    auto recordListCol2 = arrow::Table::Make(arrow::schema({table2->schema()->GetFieldByName("recordList")}),
                                             {table2->GetColumnByName("recordList")});
    bool equals = recordListCol1->Equals(*recordListCol2);
    if (!equals) {
      cout << recordListCol1->ToString() << endl;
      cout << endl << "new table" << endl;
      cout << recordListCol2->ToString() << endl;
      throw std::runtime_error("Subsequent re-read failure ");
    }  }

{code}
Apparently, as shown in the attached capture the state machine used to track nulls is broken on subsequent usage

 



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