alamb commented on code in PR #17127: URL: https://github.com/apache/datafusion/pull/17127#discussion_r2292152114
########## datafusion/datasource-parquet/src/metadata.rs: ########## @@ -0,0 +1,564 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +//! [`DFParquetMetadata`] for fetching Parquet file metadata, statistics +//! and schema information. + +use crate::{ + apply_file_schema_type_coercions, coerce_int96_to_resolution, ObjectStoreFetch, +}; +use arrow::array::{ArrayRef, BooleanArray}; +use arrow::compute::and; +use arrow::compute::kernels::cmp::eq; +use arrow::compute::sum; +use arrow::datatypes::{DataType, Schema, SchemaRef, TimeUnit}; +use datafusion_common::encryption::FileDecryptionProperties; +use datafusion_common::stats::Precision; +use datafusion_common::{ + ColumnStatistics, DataFusionError, Result, ScalarValue, Statistics, +}; +use datafusion_execution::cache::cache_manager::{FileMetadata, FileMetadataCache}; +use datafusion_functions_aggregate::min_max::{MaxAccumulator, MinAccumulator}; +use datafusion_physical_plan::Accumulator; +use log::debug; +use object_store::path::Path; +use object_store::{ObjectMeta, ObjectStore}; +use parquet::arrow::arrow_reader::statistics::StatisticsConverter; +use parquet::arrow::parquet_to_arrow_schema; +use parquet::file::metadata::{ParquetMetaData, ParquetMetaDataReader, RowGroupMetaData}; +use std::any::Any; +use std::collections::HashMap; +use std::sync::Arc; + +/// Handles fetching Parquet file schema, metadata and statistics +/// from object store. +/// +/// This component is exposed for low level integrations through +/// [`ParquetFileReaderFactory`]. +/// +/// [`ParquetFileReaderFactory`]: crate::ParquetFileReaderFactory +#[derive(Debug)] +pub struct DFParquetMetadata<'a> { + store: &'a dyn ObjectStore, + object_meta: &'a ObjectMeta, + metadata_size_hint: Option<usize>, + decryption_properties: Option<&'a FileDecryptionProperties>, + file_metadata_cache: Option<Arc<dyn FileMetadataCache>>, + /// timeunit to coerce INT96 timestamps to + pub coerce_int96: Option<TimeUnit>, +} + +impl<'a> DFParquetMetadata<'a> { + pub fn new(store: &'a dyn ObjectStore, object_meta: &'a ObjectMeta) -> Self { + Self { + store, + object_meta, + metadata_size_hint: None, + decryption_properties: None, + file_metadata_cache: None, + coerce_int96: None, + } + } + + /// set metadata size hint + pub fn with_metadata_size_hint(mut self, metadata_size_hint: Option<usize>) -> Self { + self.metadata_size_hint = metadata_size_hint; + self + } + + /// set decryption properties + pub fn with_decryption_properties( + mut self, + decryption_properties: Option<&'a FileDecryptionProperties>, + ) -> Self { + self.decryption_properties = decryption_properties; + self + } + + /// set file metadata cache + pub fn with_file_metadata_cache( + mut self, + file_metadata_cache: Option<Arc<dyn FileMetadataCache>>, + ) -> Self { + self.file_metadata_cache = file_metadata_cache; + self + } + + /// Set timeunit to coerce INT96 timestamps to + pub fn with_coerce_int96(mut self, time_unit: Option<TimeUnit>) -> Self { + self.coerce_int96 = time_unit; + self + } + + /// fetch parquet metadata + pub async fn fetch_metadata(&self) -> Result<Arc<ParquetMetaData>> { + let Self { + store, + object_meta, + metadata_size_hint, + decryption_properties, + file_metadata_cache, + coerce_int96: _, + } = self; + + let fetch = ObjectStoreFetch::new(*store, object_meta); + + // implementation to fetch parquet metadata Review Comment: Yes, it was entirely copied over -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For additional commands, e-mail: github-h...@datafusion.apache.org
