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>
85 lines
2.4 KiB
Go
85 lines
2.4 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 packed
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/*
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#cgo pkg-config: milvus_core
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#include <stdlib.h>
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#include "segcore/packed_reader_c.h"
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#include "arrow/c/abi.h"
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#include "arrow/c/helpers.h"
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*/
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import "C"
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import (
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"fmt"
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"unsafe"
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"github.com/apache/arrow/go/v12/arrow"
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"github.com/apache/arrow/go/v12/arrow/cdata"
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"github.com/cockroachdb/errors"
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)
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func NewPackedReader(path string, schema *arrow.Schema, bufferSize int) (*PackedReader, error) {
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var cas cdata.CArrowSchema
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cdata.ExportArrowSchema(schema, &cas)
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cSchema := (*C.struct_ArrowSchema)(unsafe.Pointer(&cas))
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cPath := C.CString(path)
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defer C.free(unsafe.Pointer(cPath))
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cBufferSize := C.int64_t(bufferSize)
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var cPackedReader C.CPackedReader
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status := C.NewPackedReader(cPath, cSchema, cBufferSize, &cPackedReader)
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if status != 0 {
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return nil, fmt.Errorf("failed to new packed reader: %s, status: %d", path, status)
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}
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return &PackedReader{cPackedReader: cPackedReader, schema: schema}, nil
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}
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func (pr *PackedReader) ReadNext() (arrow.Record, error) {
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var cArr C.CArrowArray
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var cSchema C.CArrowSchema
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status := C.ReadNext(pr.cPackedReader, &cArr, &cSchema)
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if status != 0 {
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return nil, fmt.Errorf("ReadNext failed with error code %d", status)
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}
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if cArr == nil {
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return nil, nil // end of stream, no more records to read
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}
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// Convert ArrowArray to Go RecordBatch using cdata
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goCArr := (*cdata.CArrowArray)(unsafe.Pointer(cArr))
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goCSchema := (*cdata.CArrowSchema)(unsafe.Pointer(cSchema))
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recordBatch, err := cdata.ImportCRecordBatch(goCArr, goCSchema)
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if err != nil {
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return nil, fmt.Errorf("failed to convert ArrowArray to Record: %w", err)
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}
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// Return the RecordBatch as an arrow.Record
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return recordBatch, nil
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}
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func (pr *PackedReader) Close() error {
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status := C.CloseReader(pr.cPackedReader)
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if status != 0 {
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return errors.New("PackedReader: failed to close file")
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}
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return nil
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}
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