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FileConvert

FileConvert converts between CSV/TSV and Parquet files (schemas supported by the Arrow library).

Table of Contents

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License

This project is licensed under the Apache License, Version 2.0.

The repository includes a number of third party packages provided under separate licenses. Details about these packages and their respective licenses is at ThirdParty/licenses/index.md.

Building

FileConvert is built using the same build process as MapD Core.

See MapD Core README

mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=debug ..
make

Development

There are several make targets that can be used to run development tools.

  • Runs cpplint through the build system:
make lint
  • Runs clang-format and updates files in place:
make format
  • Runs clang-format and returns an error if any files need to be reformatted:
make check-format
  • Runs clang-tidy and updates files in place:
make clang-tidy
  • Runs clang-tidy and returns an error if any errors are found:
make check-clang-tidy
  • After building, you can run the infer static analysis tool.
brew update
brew install infer

Make targets have been added to run the infer steps.

Other ways to use infer can be found in the article Recommended flow for CI.

  1. First run the capture step using:
make infer
  1. Next, run the analyze step using:
make infer-analyze

Note: The analyze step can take a very long time.

  1. Next, run the report step using:
make infer-report

Using

(See https://issues.apache.org/jira/browse/PARQUET-1114 for versions of Arrow and Parquet-Cpp with necessary fixes.)

The basic command line to convert a file from one type to another is:

FileConvert -i ./file.csv -o ./file.parquet

FileConvert -i ./file.parquet -o ./file1.csv

Tools from parquet-cpp can be used to verify Parquet files generated.

parquet-dump-schema ./file.parquet

parquet_reader --only-metadata ./file.parquet

parquet-scan ./file.parquet

The other command line options can be seen by typing:

FileConvert --help