mirror of
https://github.com/minio/minio.git
synced 2025-01-07 21:13:22 -05:00
148 lines
3.2 KiB
Go
148 lines
3.2 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
|
|
//
|
|
// This file is part of MinIO Object Storage stack
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package main
|
|
|
|
import (
|
|
"encoding/csv"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"path"
|
|
"strings"
|
|
|
|
"github.com/minio/minio-go/v7/pkg/set"
|
|
parquet "github.com/minio/minio/pkg/s3select/internal/parquet-go"
|
|
)
|
|
|
|
func getReader(name string, offset int64, length int64) (io.ReadCloser, error) {
|
|
file, err := os.Open(name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
fi, err := file.Stat()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if offset < 0 {
|
|
offset = fi.Size() + offset
|
|
}
|
|
|
|
if _, err = file.Seek(offset, io.SeekStart); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return file, nil
|
|
}
|
|
|
|
func printUsage() {
|
|
progName := path.Base(os.Args[0])
|
|
fmt.Printf("usage: %v PARQUET-FILE [COLUMN...]\n", progName)
|
|
fmt.Println()
|
|
fmt.Printf("examples:\n")
|
|
fmt.Printf("# Convert all columns to CSV\n")
|
|
fmt.Printf("$ %v example.parquet\n", progName)
|
|
fmt.Println()
|
|
fmt.Printf("# Convert specific columns to CSV\n")
|
|
fmt.Printf("$ %v example.par firstname dob\n", progName)
|
|
fmt.Println()
|
|
}
|
|
|
|
func main() {
|
|
if len(os.Args) < 2 {
|
|
printUsage()
|
|
os.Exit(-1)
|
|
}
|
|
|
|
name := os.Args[1]
|
|
ext := path.Ext(name)
|
|
csvFilename := name + ".csv"
|
|
if ext == ".parquet" || ext == ".par" {
|
|
csvFilename = strings.TrimSuffix(name, ext) + ".csv"
|
|
}
|
|
|
|
columns := set.CreateStringSet(os.Args[2:]...)
|
|
if len(columns) == 0 {
|
|
columns = nil
|
|
}
|
|
|
|
file, err := parquet.NewReader(
|
|
func(offset, length int64) (io.ReadCloser, error) {
|
|
return getReader(name, offset, length)
|
|
},
|
|
columns,
|
|
)
|
|
if err != nil {
|
|
fmt.Printf("%v: %v\n", name, err)
|
|
os.Exit(1)
|
|
}
|
|
|
|
defer file.Close()
|
|
|
|
csvFile, err := os.OpenFile(csvFilename, os.O_RDWR|os.O_CREATE, 0755)
|
|
if err != nil {
|
|
fmt.Printf("%v: %v\n", csvFilename, err)
|
|
os.Exit(1)
|
|
}
|
|
|
|
defer csvFile.Close()
|
|
|
|
csvWriter := csv.NewWriter(csvFile)
|
|
defer csvWriter.Flush()
|
|
|
|
headerWritten := false
|
|
for {
|
|
record, err := file.Read()
|
|
if err != nil {
|
|
if err != io.EOF {
|
|
fmt.Printf("%v: %v\n", name, err)
|
|
os.Exit(1)
|
|
}
|
|
|
|
break
|
|
}
|
|
|
|
if !headerWritten {
|
|
var csvRecord []string
|
|
record.Range(func(name string, value parquet.Value) bool {
|
|
csvRecord = append(csvRecord, name)
|
|
return true
|
|
})
|
|
|
|
if err = csvWriter.Write(csvRecord); err != nil {
|
|
fmt.Printf("%v: %v\n", csvFilename, err)
|
|
os.Exit(1)
|
|
}
|
|
|
|
headerWritten = true
|
|
}
|
|
|
|
var csvRecord []string
|
|
record.Range(func(name string, value parquet.Value) bool {
|
|
csvRecord = append(csvRecord, fmt.Sprintf("%v", value.Value))
|
|
return true
|
|
})
|
|
|
|
if err = csvWriter.Write(csvRecord); err != nil {
|
|
fmt.Printf("%v: %v\n", csvFilename, err)
|
|
os.Exit(1)
|
|
}
|
|
}
|
|
}
|