I have been given a parquet file with the following schema:

• Name: string
• Ident: string
• Date: date32[day]
• EventTimestamp: timestamp[us]

I dumped out the schema using a simple python script:

#! /usr/bin/env python3
import pyarrow as pa
import pyarrow.parquet as pq
import sys

schema = pq.read_schema(sys.argv[1])
print(schema)

My question is: What C++ type is date32[day]? I’ve looked all over and it SEEMS like the underlying data type is int32_t. But if I try to read it using that type, I get:

terminate called after throwing an instance of 'parquet::ParquetException'
  what():  Column converted type mismatch.  Column 'Date' has converted type 'DATE' not 'INT_32'

I’ve also tried using a string but I get this error:

terminate called after throwing an instance of 'parquet::ParquetException'
  what():  Column physical type mismatch.  Column 'Date' has physical type 'INT32' not 'BYTE_ARRAY'

Here’s my code:

#include <iostream>
#include "arrow/io/file.h"
#include "parquet/stream_reader.h"
#include "readfile.h"

int main(int argc, char **argv)
{

if (argc < 2)
{
  std::cout << "Usage: " << argv[0] << " <input filename" << std::endl;
  exit(2);
}
char *input_filename = argv[1];
std::cout << "Input filename is " << input_filename << std::endl;
std::shared_ptr<arrow::io::ReadableFile> infile;

PARQUET_ASSIGN_OR_THROW(
    infile,
    arrow::io::ReadableFile::Open(input_filename));

parquet::StreamReader os{parquet::ParquetFileReader::Open(infile)}
std::string name;
std::string ident;
int32_t date;
std::string ts_event_utc;

while (!os.eof())
{
  os >> name >> ident >> date >> ts_event_utc >> parquet::EndRow;      
}