Public helpers for writing and concatenating Arrow tables to Parquet files. More...

Functions
String	generateUuidV4 ()
	Generate a lowercase hyphenated RFC 4122 version-4 UUID string.

bool	writeTableToParquet (const std::shared_ptr< arrow::Table > &table, const String &filename, const ParquetWriteConfig &config=ParquetWriteConfig{})
	Write an Arrow table to a Parquet file.

bool	concatenateAndWriteToParquet (const std::vector< std::shared_ptr< arrow::Table > > &tables, const String &filename, const ParquetWriteConfig &config=ParquetWriteConfig{})
	Concatenate a vector of Arrow tables and write the result to a Parquet file.

Detailed Description

Public helpers for writing and concatenating Arrow tables to Parquet files.

TOPP tools link against libOpenMS (which exports these helpers) but not directly against Arrow/Parquet. These wrappers keep all Arrow/Parquet API calls inside libOpenMS so downstream binaries don't need to import Arrow symbols.

Function Documentation

◆ concatenateAndWriteToParquet()

bool concatenateAndWriteToParquet	(	const std::vector< std::shared_ptr< arrow::Table > > &	tables,
		const String &	filename,
		const ParquetWriteConfig &	config = `ParquetWriteConfig{}`
	)

Concatenate a vector of Arrow tables and write the result to a Parquet file.

All tables must share the same schema. An empty input vector is a no-op (returns true without writing).

Parameters

[in]	tables	Vector of Arrow tables to concatenate (must share schema)
[in]	filename	Output file path
[in]	config	Parquet writer configuration

Returns: true on success (or if tables is empty), false on error

◆ generateUuidV4()

String generateUuidV4 ( )

Generate a lowercase hyphenated RFC 4122 version-4 UUID string.

Used by QPX Parquet exporters when attaching file metadata.

Returns: UUID string, e.g. "550e8400-e29b-41d4-a716-446655440000"

◆ writeTableToParquet()

bool writeTableToParquet	(	const std::shared_ptr< arrow::Table > &	table,
		const String &	filename,
		const ParquetWriteConfig &	config = `ParquetWriteConfig{}`
	)

Write an Arrow table to a Parquet file.