emkornfield commented on a change in pull request #11538: URL: https://github.com/apache/arrow/pull/11538#discussion_r779317046
########## File path: go/parquet/file/column_writer.go ########## @@ -0,0 +1,570 @@ +// 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 ( + "bytes" + "encoding/binary" + "io" + + "github.com/apache/arrow/go/v7/arrow" + "github.com/apache/arrow/go/v7/arrow/array" + "github.com/apache/arrow/go/v7/arrow/bitutil" + "github.com/apache/arrow/go/v7/arrow/memory" + "github.com/apache/arrow/go/v7/parquet" + "github.com/apache/arrow/go/v7/parquet/internal/encoding" + "github.com/apache/arrow/go/v7/parquet/metadata" + "github.com/apache/arrow/go/v7/parquet/schema" +) + +//go:generate go run ../../arrow/_tools/tmpl/main.go -i -data=../internal/encoding/physical_types.tmpldata column_writer_types.gen.go.tmpl + +// ColumnChunkWriter is the base interface for all columnwriters. To directly write +// data to the column, you need to assert it to the correctly typed ColumnChunkWriter +// instance, such as Int32ColumnWriter. +type ColumnChunkWriter interface { + // Close ends this column and returns the number of bytes written + Close() error + // Type returns the underlying physical parquet type for this column + Type() parquet.Type + // Descr returns the column information for this writer + Descr() *schema.Column + // RowsWritten returns the number of rows that have so far been written with this writer + RowsWritten() int + // TotalCompressedBytes returns the number of bytes, after compression, that have been written so far + TotalCompressedBytes() int64 + // TotalBytesWritten includes the bytes for writing dictionary pages, while TotalCompressedBytes is + // just the data and page headers + TotalBytesWritten() int64 + // Properties returns the current WriterProperties in use for this writer + Properties() *parquet.WriterProperties + + LevelInfo() LevelInfo + SetBitsBuffer(*memory.Buffer) +} + +func computeLevelInfo(descr *schema.Column) (info LevelInfo) { + info.DefLevel = descr.MaxDefinitionLevel() + info.RepLevel = descr.MaxRepetitionLevel() + + minSpacedDefLevel := descr.MaxDefinitionLevel() + n := descr.SchemaNode() + for n != nil && n.RepetitionType() != parquet.Repetitions.Repeated { + if n.RepetitionType() == parquet.Repetitions.Optional { + minSpacedDefLevel-- + } + n = n.Parent() + } + info.RepeatedAncestorDefLevel = minSpacedDefLevel + return +} + +type columnWriter struct { + metaData *metadata.ColumnChunkMetaDataBuilder + descr *schema.Column + + // scratch buffer if validity bits need to be recalculated + bitsBuffer *memory.Buffer + levelInfo LevelInfo + pager PageWriter + hasDict bool + encoding parquet.Encoding + props *parquet.WriterProperties + defEncoder encoding.LevelEncoder + repEncoder encoding.LevelEncoder + mem memory.Allocator + + pageStatistics metadata.TypedStatistics + chunkStatistics metadata.TypedStatistics + + // total number of values stored in the current data page. this is the maximum + // of the number of encoded def levels or encoded values. for + // non-repeated, required columns, this is equal to the number of encoded + // values. For repeated or optional values, there may be fewer data values + // than levels, and this tells you how many encoded levels there are in that case + numBufferedValues int64 + + // the total number of stored values in the current page. for repeated or optional + // values. this number may be lower than numBuffered + numDataValues int64 + + rowsWritten int + totalBytesWritten int64 + // records the current number of compressed bytes in a column + totalCompressedBytes int64 + closed bool + fallbackToNonDict bool + + pages []DataPage + + defLevelSink *encoding.PooledBufferWriter + repLevelSink *encoding.PooledBufferWriter + + uncompressedData bytes.Buffer + compressedTemp *bytes.Buffer + + currentEncoder encoding.TypedEncoder +} + +func newColumnWriterBase(metaData *metadata.ColumnChunkMetaDataBuilder, pager PageWriter, useDict bool, enc parquet.Encoding, props *parquet.WriterProperties) columnWriter { + ret := columnWriter{ + metaData: metaData, + descr: metaData.Descr(), + levelInfo: computeLevelInfo(metaData.Descr()), + pager: pager, + hasDict: useDict, + encoding: enc, + props: props, + mem: props.Allocator(), + defLevelSink: encoding.NewPooledBufferWriter(0), + repLevelSink: encoding.NewPooledBufferWriter(0), + } + if pager.HasCompressor() { + ret.compressedTemp = new(bytes.Buffer) + } + if props.StatisticsEnabledFor(ret.descr.Path()) && ret.descr.SortOrder() != schema.SortUNKNOWN { + ret.pageStatistics = metadata.NewStatistics(ret.descr, props.Allocator()) + ret.chunkStatistics = metadata.NewStatistics(ret.descr, props.Allocator()) + } + + ret.defEncoder.Init(parquet.Encodings.RLE, ret.descr.MaxDefinitionLevel(), ret.defLevelSink) + ret.repEncoder.Init(parquet.Encodings.RLE, ret.descr.MaxRepetitionLevel(), ret.repLevelSink) + + ret.reset() + + return ret +} + +func (w *columnWriter) SetBitsBuffer(buf *memory.Buffer) { w.bitsBuffer = buf } + +func (w *columnWriter) LevelInfo() LevelInfo { return w.levelInfo } + +func (w *columnWriter) Type() parquet.Type { + return w.descr.PhysicalType() +} + +func (w *columnWriter) Descr() *schema.Column { + return w.descr +} + +func (w *columnWriter) Properties() *parquet.WriterProperties { + return w.props +} + +func (w *columnWriter) TotalCompressedBytes() int64 { + return w.totalCompressedBytes +} + +func (w *columnWriter) TotalBytesWritten() int64 { + return w.totalBytesWritten +} + +func (w *columnWriter) RowsWritten() int { + return w.rowsWritten +} + +func (w *columnWriter) WriteDataPage(page DataPage) error { + written, err := w.pager.WriteDataPage(page) + w.totalBytesWritten += written + return err +} + +func (w *columnWriter) WriteDefinitionLevels(levels []int16) { + w.defEncoder.EncodeNoFlush(levels) +} + +func (w *columnWriter) WriteRepetitionLevels(levels []int16) { + w.repEncoder.EncodeNoFlush(levels) +} + +func (w *columnWriter) reset() { + w.defLevelSink.Reset(0) + w.repLevelSink.Reset(0) + + if w.props.DataPageVersion() == parquet.DataPageV1 { + // offset the buffers to make room to record the number of levels at the + // beginning of each after we've encoded them with RLE + if w.descr.MaxDefinitionLevel() > 0 { + w.defLevelSink.SetOffset(arrow.Uint32SizeBytes) + } + if w.descr.MaxRepetitionLevel() > 0 { + w.repLevelSink.SetOffset(arrow.Uint32SizeBytes) + } + } + + w.defEncoder.Reset(w.descr.MaxDefinitionLevel()) + w.repEncoder.Reset(w.descr.MaxRepetitionLevel()) +} + +func (w *columnWriter) concatBuffers(defLevelsSize, repLevelsSize int64, values []byte, wr io.Writer) { + wr.Write(w.repLevelSink.Bytes()[:repLevelsSize]) + wr.Write(w.defLevelSink.Bytes()[:defLevelsSize]) + wr.Write(values) +} + +func (w *columnWriter) EstimatedBufferedValueBytes() int64 { + return w.currentEncoder.EstimatedDataEncodedSize() +} + +func (w *columnWriter) commitWriteAndCheckPageLimit(numLevels, numValues int64) error { + w.numBufferedValues += numLevels + w.numDataValues += numValues + + if w.currentEncoder.EstimatedDataEncodedSize() >= w.props.DataPageSize() { + return w.FlushCurrentPage() + } + return nil +} + +func (w *columnWriter) FlushCurrentPage() error { + var ( + defLevelsRLESize int64 = 0 + repLevelsRLESize int64 = 0 + ) + + values, err := w.currentEncoder.FlushValues() + if err != nil { + return err + } + defer values.Release() + + isV1DataPage := w.props.DataPageVersion() == parquet.DataPageV1 + if w.descr.MaxDefinitionLevel() > 0 { + w.defEncoder.Flush() + w.defLevelSink.SetOffset(0) + sz := w.defEncoder.Len() + if isV1DataPage { + sz += arrow.Uint32SizeBytes + binary.LittleEndian.PutUint32(w.defLevelSink.Bytes(), uint32(w.defEncoder.Len())) + } + defLevelsRLESize = int64(sz) + } + + if w.descr.MaxRepetitionLevel() > 0 { + w.repEncoder.Flush() + w.repLevelSink.SetOffset(0) + if isV1DataPage { + binary.LittleEndian.PutUint32(w.repLevelSink.Bytes(), uint32(w.repEncoder.Len())) + } + repLevelsRLESize = int64(w.repLevelSink.Len()) + } + + uncompressed := defLevelsRLESize + repLevelsRLESize + int64(values.Len()) + if isV1DataPage { + w.buildDataPageV1(defLevelsRLESize, repLevelsRLESize, uncompressed, values.Bytes()) + } else { + w.buildDataPageV2(defLevelsRLESize, repLevelsRLESize, uncompressed, values.Bytes()) + } + + w.reset() + w.numBufferedValues, w.numDataValues = 0, 0 + return nil +} + +func (w *columnWriter) buildDataPageV1(defLevelsRLESize, repLevelsRLESize, uncompressed int64, values []byte) error { + w.uncompressedData.Reset() + w.uncompressedData.Grow(int(uncompressed)) + w.concatBuffers(defLevelsRLESize, repLevelsRLESize, values, &w.uncompressedData) + + pageStats, err := w.getPageStatistics() + if err != nil { + return err + } + pageStats.ApplyStatSizeLimits(int(w.props.MaxStatsSizeFor(w.descr.Path()))) + pageStats.Signed = schema.SortSIGNED == w.descr.SortOrder() + w.resetPageStatistics() + + var data []byte + if w.pager.HasCompressor() { + w.compressedTemp.Reset() + data = w.pager.Compress(w.compressedTemp, w.uncompressedData.Bytes()) + } else { + data = w.uncompressedData.Bytes() + } + + // write the page to sink eagerly if there's no dictionary or if dictionary encoding has fallen back + if w.hasDict && !w.fallbackToNonDict { + pageSlice := make([]byte, len(data)) + copy(pageSlice, data) + page := NewDataPageV1WithStats(memory.NewBufferBytes(pageSlice), int32(w.numBufferedValues), w.encoding, parquet.Encodings.RLE, parquet.Encodings.RLE, uncompressed, pageStats) + w.totalCompressedBytes += int64(page.buf.Len()) // + size of Pageheader + w.pages = append(w.pages, page) + } else { + w.totalCompressedBytes += int64(len(data)) + dp := NewDataPageV1WithStats(memory.NewBufferBytes(data), int32(w.numBufferedValues), w.encoding, parquet.Encodings.RLE, parquet.Encodings.RLE, uncompressed, pageStats) + defer dp.Release() + w.WriteDataPage(dp) + } + return nil +} + +func (w *columnWriter) buildDataPageV2(defLevelsRLESize, repLevelsRLESize, uncompressed int64, values []byte) error { + var data []byte + if w.pager.HasCompressor() { + w.compressedTemp.Reset() + data = w.pager.Compress(w.compressedTemp, values) + // data = w.compressedTemp.Bytes() + } else { + data = values + } + + // concatenate uncompressed levels and the possibly compressed values + var combined bytes.Buffer + combined.Grow(int(defLevelsRLESize + repLevelsRLESize + int64(len(data)))) + w.concatBuffers(defLevelsRLESize, repLevelsRLESize, data, &combined) + + pageStats, err := w.getPageStatistics() + if err != nil { + return err + } + pageStats.ApplyStatSizeLimits(int(w.props.MaxStatsSizeFor(w.descr.Path()))) + pageStats.Signed = schema.SortSIGNED == w.descr.SortOrder() + w.resetPageStatistics() + + numValues := int32(w.numBufferedValues) + nullCount := int32(pageStats.NullCount) + defLevelsByteLen := int32(defLevelsRLESize) + repLevelsByteLen := int32(repLevelsRLESize) + + page := NewDataPageV2WithStats(memory.NewBufferBytes(combined.Bytes()), numValues, nullCount, numValues, w.encoding, + defLevelsByteLen, repLevelsByteLen, uncompressed, w.pager.HasCompressor(), pageStats) + if w.hasDict && !w.fallbackToNonDict { + w.totalCompressedBytes += int64(page.buf.Len()) // + sizeof pageheader + w.pages = append(w.pages, page) + } else { + w.totalCompressedBytes += int64(combined.Len()) + defer page.Release() + w.WriteDataPage(page) + } + return nil +} + +func (w *columnWriter) FlushBufferedDataPages() { + if w.numBufferedValues > 0 { + w.FlushCurrentPage() + } + + for _, p := range w.pages { + defer p.Release() + w.WriteDataPage(p) + } + w.pages = w.pages[:0] + w.totalCompressedBytes = 0 +} + +func (w *columnWriter) writeLevels(numValues int64, defLevels, repLevels []int16) int64 { + toWrite := int64(0) + // if the field is required and non-repeated, no definition levels + if defLevels != nil && w.descr.MaxDefinitionLevel() > 0 { + for _, v := range defLevels { + if v == w.descr.MaxDefinitionLevel() { + toWrite++ + } + } + w.WriteDefinitionLevels(defLevels[:numValues]) + } else { + toWrite = numValues + } + + if repLevels != nil && w.descr.MaxRepetitionLevel() > 0 { + // a row could include more than one value + //count the occasions where we start a new row + for _, v := range repLevels { + if v == 0 { + w.rowsWritten++ + } + } + + w.WriteRepetitionLevels(repLevels[:numValues]) + } else { + // each value is exactly 1 row + w.rowsWritten += int(numValues) + } + return toWrite +} + +func (w *columnWriter) writeLevelsSpaced(numLevels int64, defLevels, repLevels []int16) { + if w.descr.MaxDefinitionLevel() > 0 { + w.WriteDefinitionLevels(defLevels[:numLevels]) + } + + if w.descr.MaxRepetitionLevel() > 0 { + for _, v := range repLevels { + if v == 0 { + w.rowsWritten++ + } + } + w.WriteRepetitionLevels(repLevels[:numLevels]) + } else { + w.rowsWritten += int(numLevels) + } +} + +func (w *columnWriter) WriteDictionaryPage() error { + dictEncoder := w.currentEncoder.(encoding.DictEncoder) + buffer := memory.NewResizableBuffer(w.mem) + buffer.Resize(dictEncoder.DictEncodedSize()) + dictEncoder.WriteDict(buffer.Bytes()) + defer buffer.Release() + + page := NewDictionaryPage(buffer, int32(dictEncoder.NumEntries()), w.props.DictionaryPageEncoding()) + written, err := w.pager.WriteDictionaryPage(page) + w.totalBytesWritten += written + return err +} + +type batchWriteInfo struct { + batchNum int64 + nullCount int64 +} + +func (b batchWriteInfo) numSpaced() int64 { return b.batchNum + b.nullCount } + +// this will always update the three otuput params Review comment: typo: ```suggestion // this will always update the three output params ``` -- This is an automated message from the Apache Git Service. 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