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// 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.
package file
import (
"fmt"
"sync"
"github.com/apache/arrow-go/v18/internal/utils"
"github.com/apache/arrow-go/v18/parquet"
"github.com/apache/arrow-go/v18/parquet/internal/encoding"
"github.com/apache/arrow-go/v18/parquet/internal/encryption"
format "github.com/apache/arrow-go/v18/parquet/internal/gen-go/parquet"
"github.com/apache/arrow-go/v18/parquet/metadata"
"golang.org/x/xerrors"
)
const (
maxDictHeaderSize int64 = 100
)
// RowGroupReader is the primary interface for reading a single row group
type RowGroupReader struct {
r parquet.ReaderAtSeeker
fileMetadata *metadata.FileMetaData
rgMetadata *metadata.RowGroupMetaData
props *parquet.ReaderProperties
fileDecryptor encryption.FileDecryptor
pageIndexReader *metadata.PageIndexReader
rgPageIndexReader *metadata.RowGroupPageIndexReader
bufferPool *sync.Pool
}
// MetaData returns the metadata of the current Row Group
func (r *RowGroupReader) MetaData() *metadata.RowGroupMetaData { return r.rgMetadata }
// NumColumns returns the number of columns of data as defined in the metadata of this row group
func (r *RowGroupReader) NumColumns() int { return r.rgMetadata.NumColumns() }
// NumRows returns the number of rows in just this row group
func (r *RowGroupReader) NumRows() int64 { return r.rgMetadata.NumRows() }
// ByteSize returns the full byte size of this row group as defined in its metadata
func (r *RowGroupReader) ByteSize() int64 { return r.rgMetadata.TotalByteSize() }
// Column returns a column reader for the requested (0-indexed) column
//
// panics if passed a column not in the range [0, NumColumns)
func (r *RowGroupReader) Column(i int) (ColumnChunkReader, error) {
if i >= r.NumColumns() || i < 0 {
return nil, fmt.Errorf("parquet: trying to read column index %d but row group metadata only has %d columns", i, r.rgMetadata.NumColumns())
}
descr := r.fileMetadata.Schema.Column(i)
pageRdr, err := r.GetColumnPageReader(i)
if err != nil {
return nil, fmt.Errorf("parquet: unable to initialize page reader: %w", err)
}
return newTypedColumnChunkReader(columnChunkReader{
descr: descr,
rdr: pageRdr,
mem: r.props.Allocator(),
bufferPool: r.bufferPool,
decoders: make(map[format.Encoding]encoding.TypedDecoder),
}), nil
}
func (r *RowGroupReader) GetColumnPageReader(i int) (PageReader, error) {
col, err := r.rgMetadata.ColumnChunk(i)
if err != nil {
return nil, err
}
if r.rgPageIndexReader == nil {
rgIdx, err := r.pageIndexReader.RowGroup(int(r.rgMetadata.Ordinal()))
if err != nil {
return nil, err
}
r.rgPageIndexReader = rgIdx
}
colStart := col.DataPageOffset()
if col.HasDictionaryPage() && col.DictionaryPageOffset() > 0 && colStart > col.DictionaryPageOffset() {
colStart = col.DictionaryPageOffset()
}
colLen := col.TotalCompressedSize()
// PARQUET-816 workaround for old files created by older parquet-mr
if r.fileMetadata.WriterVersion().LessThan(metadata.Parquet816FixedVersion) {
sourceSz := r.fileMetadata.GetSourceFileSize()
// The Parquet MR writer had a bug in 1.2.8 and below where it didn't include the
// dictionary page header size in total_compressed_size and total_uncompressed_size
// (see IMPALA-694). We add padding to compensate.
if colStart < 0 || colLen < 0 {
return nil, fmt.Errorf("invalid column chunk metadata, offset (%d) and length (%d) should both be positive", colStart, colLen)
}
if colStart > sourceSz || colLen > sourceSz {
return nil, fmt.Errorf("invalid column chunk metadata, offset (%d) and length (%d) must both be less than total source size (%d)", colStart, colLen, sourceSz)
}
bytesRemain := sourceSz - (colStart + colLen)
padding := utils.Min(maxDictHeaderSize, bytesRemain)
colLen += padding
}
stream, err := r.props.GetStream(r.r, colStart, colLen)
if err != nil {
return nil, err
}
cryptoMetadata := col.CryptoMetadata()
if cryptoMetadata == nil {
pr := &serializedPageReader{
r: stream,
chunk: col,
colIdx: i,
pgIndexReader: r.rgPageIndexReader,
maxPageHeaderSize: defaultMaxPageHeaderSize,
nrows: col.NumValues(),
mem: r.props.Allocator(),
}
return pr, pr.init(col.Compression(), nil)
}
if r.fileDecryptor == nil {
return nil, xerrors.New("column in rowgroup is encrypted, but no file decryptor")
}
const encryptedRowGroupsLimit = 32767
if i > encryptedRowGroupsLimit {
return nil, xerrors.New("encrypted files cannot contain more than 32767 column chunks")
}
if cryptoMetadata.IsSetENCRYPTION_WITH_FOOTER_KEY() {
ctx := CryptoContext{
StartDecryptWithDictionaryPage: col.HasDictionaryPage(),
RowGroupOrdinal: r.rgMetadata.Ordinal(),
ColumnOrdinal: int16(i),
MetaDecryptor: r.fileDecryptor.GetFooterDecryptorForColumnMeta(""),
DataDecryptor: r.fileDecryptor.GetFooterDecryptorForColumnData(""),
}
pr := &serializedPageReader{
r: stream,
chunk: col,
colIdx: i,
pgIndexReader: r.rgPageIndexReader,
maxPageHeaderSize: defaultMaxPageHeaderSize,
nrows: col.NumValues(),
mem: r.props.Allocator(),
cryptoCtx: ctx,
}
return pr, pr.init(col.Compression(), &ctx)
}
// column encrypted with it's own key
columnKeyMeta := cryptoMetadata.GetENCRYPTION_WITH_COLUMN_KEY().KeyMetadata
columnPath := cryptoMetadata.GetENCRYPTION_WITH_COLUMN_KEY().PathInSchema
ctx := CryptoContext{
StartDecryptWithDictionaryPage: col.HasDictionaryPage(),
RowGroupOrdinal: r.rgMetadata.Ordinal(),
ColumnOrdinal: int16(i),
MetaDecryptor: r.fileDecryptor.GetColumnMetaDecryptor(parquet.ColumnPath(columnPath).String(), string(columnKeyMeta), ""),
DataDecryptor: r.fileDecryptor.GetColumnDataDecryptor(parquet.ColumnPath(columnPath).String(), string(columnKeyMeta), ""),
}
pr := &serializedPageReader{
r: stream,
chunk: col,
colIdx: i,
pgIndexReader: r.rgPageIndexReader,
maxPageHeaderSize: defaultMaxPageHeaderSize,
nrows: col.NumValues(),
mem: r.props.Allocator(),
cryptoCtx: ctx,
}
return pr, pr.init(col.Compression(), &ctx)
}
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