mirror of
https://gitee.com/milvus-io/milvus.git
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c4ae9f4ece
related: https://github.com/milvus-io/milvus/issues/39173 Signed-off-by: shaoting-huang <shaoting.huang@zilliz.com>
81 lines
2.5 KiB
Go
81 lines
2.5 KiB
Go
// Copyright 2023 Zilliz
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package arrowutil
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import (
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"context"
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"github.com/apache/arrow/go/v12/arrow/array"
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"github.com/apache/arrow/go/v12/arrow/memory"
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"github.com/apache/arrow/go/v12/parquet/file"
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"github.com/apache/arrow/go/v12/parquet/pqarrow"
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"github.com/milvus-io/milvus/internal/storagev2/common/constant"
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"github.com/milvus-io/milvus/internal/storagev2/io/fs"
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"github.com/milvus-io/milvus/internal/storagev2/storage/options"
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)
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func MakeArrowFileReader(fs fs.Fs, filePath string) (*pqarrow.FileReader, error) {
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f, err := fs.OpenFile(filePath)
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if err != nil {
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return nil, err
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}
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parquetReader, err := file.NewParquetReader(f)
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if err != nil {
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return nil, err
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}
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return pqarrow.NewFileReader(parquetReader, pqarrow.ArrowReadProperties{BatchSize: constant.ReadBatchSize}, memory.DefaultAllocator)
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}
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func MakeArrowRecordReader(reader *pqarrow.FileReader, opts *options.ReadOptions) (array.RecordReader, error) {
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var rowGroupsIndices []int
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var columnIndices []int
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metadata := reader.ParquetReader().MetaData()
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for _, c := range opts.Columns {
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columnIndices = append(columnIndices, metadata.Schema.ColumnIndexByName(c))
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}
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for _, f := range opts.Filters {
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columnIndices = append(columnIndices, metadata.Schema.ColumnIndexByName(f.GetColumnName()))
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}
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for i := 0; i < len(metadata.RowGroups); i++ {
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rg := metadata.RowGroup(i)
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var canIgnored bool
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for _, filter := range opts.Filters {
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columnIndex := rg.Schema.ColumnIndexByName(filter.GetColumnName())
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columnChunk, err := rg.ColumnChunk(columnIndex)
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if err != nil {
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return nil, err
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}
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columnStats, err := columnChunk.Statistics()
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if err != nil {
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return nil, err
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}
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if columnStats == nil || !columnStats.HasMinMax() {
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continue
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}
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if filter.CheckStatistics(columnStats) {
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canIgnored = true
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break
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}
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}
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if !canIgnored {
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rowGroupsIndices = append(rowGroupsIndices, i)
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}
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}
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return reader.GetRecordReader(context.TODO(), columnIndices, rowGroupsIndices)
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}
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