iceberg::parquet::ParquetMetrics Class Reference

Utility class for computing metrics from Parquet files. More...

#include <parquet_metrics_internal.h>

Static Public Member Functions
static Result< Metrics >	GetMetrics (const Schema &schema, const ::parquet::SchemaDescriptor &parquet_schema, const MetricsConfig &metrics_config, const ::parquet::FileMetaData &metadata, const std::unordered_map< int32_t, FieldMetrics > &field_metrics={})
	Compute file-level metrics from Parquet file metadata.

Detailed Description

Utility class for computing metrics from Parquet files.

Member Function Documentation

GetMetrics()

Result< Metrics > iceberg::parquet::ParquetMetrics::GetMetrics ( const Schema &  schema, const ::parquet::SchemaDescriptor &  parquet_schema, const MetricsConfig &  metrics_config, const ::parquet::FileMetaData &  metadata, const std::unordered_map< int32_t, FieldMetrics > &  field_metrics = {}  )

static

Compute file-level metrics from Parquet file metadata.

This function extracts metrics including row count, column sizes, value counts, null value counts, and lower/upper bounds from Parquet file metadata. NaN value counts are not currently collected from Parquet metadata. The metrics are computed according to the provided MetricsConfig, which determines which columns to collect metrics for and at what granularity (counts only, truncated bounds, or full bounds).

Parameters

schema	The Iceberg schema for the table.
parquet_schema	The Parquet schema descriptor.
metrics_config	The configuration specifying how to collect metrics.
metadata	The Parquet file metadata containing row group statistics.
field_metrics	Optional per-field metrics computed during write. If provided, these take precedence over footer statistics.

Returns

Result containing the computed Metrics or an error.

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The documentation for this class was generated from the following files:

• iceberg/parquet/parquet_metrics_internal.h
• iceberg/parquet/parquet_metrics.cc