mirror of https://github.com/minio/minio.git
139 lines
3.9 KiB
Go
139 lines
3.9 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package parquet
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import (
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"fmt"
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"io"
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"time"
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"github.com/bcicen/jstream"
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jsonfmt "github.com/minio/minio/internal/s3select/json"
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"github.com/minio/minio/internal/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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reader *parquetgo.Reader
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}
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// Read - reads single record.
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func (r *Reader) Read(dst sql.Record) (rec sql.Record, rerr error) {
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defer func() {
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if rec := recover(); rec != nil {
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rerr = fmt.Errorf("panic reading parquet record: %v", rec)
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}
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}()
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parquetRecord, err := r.reader.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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kvs := jstream.KVS{}
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f := func(name string, v parquetgo.Value) bool {
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if v.Value == nil {
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kvs = append(kvs, jstream.KV{Key: name, Value: nil})
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return true
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}
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var value interface{}
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switch v.Type {
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case parquetgen.Type_BOOLEAN:
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value = v.Value.(bool)
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case parquetgen.Type_INT32:
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value = int64(v.Value.(int32))
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if v.Schema != nil && v.Schema.ConvertedType != nil {
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switch *v.Schema.ConvertedType {
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case parquetgen.ConvertedType_DATE:
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value = sql.FormatSQLTimestamp(time.Unix(60*60*24*int64(v.Value.(int32)), 0).UTC())
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}
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}
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case parquetgen.Type_INT64:
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value = v.Value.(int64)
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if v.Schema != nil && v.Schema.ConvertedType != nil {
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switch *v.Schema.ConvertedType {
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// Only UTC supported, add one NS to never be exactly midnight.
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case parquetgen.ConvertedType_TIMESTAMP_MILLIS:
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value = sql.FormatSQLTimestamp(time.Unix(0, 0).Add(time.Duration(v.Value.(int64)) * time.Millisecond).UTC())
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case parquetgen.ConvertedType_TIMESTAMP_MICROS:
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value = sql.FormatSQLTimestamp(time.Unix(0, 0).Add(time.Duration(v.Value.(int64)) * time.Microsecond).UTC())
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}
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}
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case parquetgen.Type_FLOAT:
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value = float64(v.Value.(float32))
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case parquetgen.Type_DOUBLE:
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value = 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 = string(v.Value.([]byte))
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default:
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rerr = errParquetParsingError(nil)
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return false
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}
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kvs = append(kvs, jstream.KV{Key: name, Value: value})
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return true
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}
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// Apply our range
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parquetRecord.Range(f)
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// Reuse destination if we can.
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dstRec, ok := dst.(*jsonfmt.Record)
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if !ok {
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dstRec = &jsonfmt.Record{}
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}
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dstRec.SelectFormat = sql.SelectFmtParquet
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dstRec.KVS = kvs
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return dstRec, nil
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}
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// Close - closes underlying readers.
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func (r *Reader) Close() error {
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return r.reader.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) (r *Reader, err error) {
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defer func() {
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if rec := recover(); rec != nil {
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err = fmt.Errorf("panic reading parquet header: %v", rec)
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}
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}()
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reader, err := parquetgo.NewReader(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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reader: reader,
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}, nil
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}
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