mirror of
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94 lines
2.4 KiB
Go
94 lines
2.4 KiB
Go
/*
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* Minio Cloud Storage, (C) 2019 Minio, Inc.
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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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*/
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package parquet
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import (
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"io"
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"github.com/minio/minio/pkg/s3select/json"
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"github.com/minio/minio/pkg/s3select/sql"
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parquetgo "github.com/minio/parquet-go"
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parquetgen "github.com/minio/parquet-go/gen-go/parquet"
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)
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// Reader - Parquet record reader for S3Select.
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type Reader struct {
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args *ReaderArgs
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file *parquetgo.File
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}
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// Read - reads single record.
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func (r *Reader) Read() (sql.Record, error) {
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parquetRecord, err := r.file.Read()
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if err != nil {
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if err != io.EOF {
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return nil, errParquetParsingError(err)
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}
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return nil, err
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}
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record := json.NewRecord()
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for name, v := range parquetRecord {
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var value *sql.Value
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switch v.Type {
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case parquetgen.Type_BOOLEAN:
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value = sql.NewBool(v.Value.(bool))
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case parquetgen.Type_INT32:
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value = sql.NewInt(int64(v.Value.(int32)))
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case parquetgen.Type_INT64:
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value = sql.NewInt(v.Value.(int64))
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case parquetgen.Type_FLOAT:
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value = sql.NewFloat(float64(v.Value.(float32)))
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case parquetgen.Type_DOUBLE:
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value = sql.NewFloat(v.Value.(float64))
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case parquetgen.Type_INT96, parquetgen.Type_BYTE_ARRAY, parquetgen.Type_FIXED_LEN_BYTE_ARRAY:
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value = sql.NewString(string(v.Value.([]byte)))
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default:
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return nil, errParquetParsingError(nil)
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}
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if err = record.Set(name, value); err != nil {
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return nil, errParquetParsingError(err)
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}
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}
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return record, nil
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}
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// Close - closes underlaying readers.
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func (r *Reader) Close() error {
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return r.file.Close()
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}
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// NewReader - creates new Parquet reader using readerFunc callback.
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func NewReader(getReaderFunc func(offset, length int64) (io.ReadCloser, error), args *ReaderArgs) (*Reader, error) {
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file, err := parquetgo.Open(getReaderFunc, nil)
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if err != nil {
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if err != io.EOF {
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return nil, errParquetParsingError(err)
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}
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return nil, err
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}
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return &Reader{
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args: args,
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file: file,
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}, nil
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}
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