[C++] error when writing Timestamps in NANOS resolution using StreamWriter to parquet files

[anders johansson]

Hi,

I am trying to write time stamps in int64_t format representing time in UTC
normalized nanoseconds to a parquet file.

I'm using the following code:

auto time_type = LogicalType::Timestamp(true, LogicalType::TimeUnit::NANOS,
false, false);
NodeVector nv;

nv.push_back(PrimitiveNode::Make("Time", Repetition::REQUIRED,  time_type,
Type::INT64));

but when I try to write to the output stream

std::shared_ptr<parquet::StreamWriter> parquet_os_;
*parquet_os_ << se.time; /* time is uint64_t */

I get the following runtime error:"Column converted type mismatch.  Column
'Time' has converted type[NONE] not 'INT_64'"

Everything works fine if I set:

auto time_type = LogicalType::Timestamp(true, LogicalType::TimeUnit::NANOS,
false, false);

but I want it as Time or Timestamp so that I get it in the proper format
when I read the file using pandas in python.

Thanks,
Anders