forked from fraugster/parquet-go
-
Notifications
You must be signed in to change notification settings - Fork 0
/
main.go
65 lines (53 loc) · 1.01 KB
/
main.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
package main
import (
"flag"
"fmt"
"io"
"log"
"os"
goparquet "github.com/infosum/parquet-go"
)
func main() {
flag.Parse()
if len(flag.Args()) == 0 {
log.Fatalf("Usage: %s <parquet-file>...", os.Args[0])
}
for _, file := range flag.Args() {
if err := printFile(file); err != nil {
log.Printf("Failed to print file %s: %v", file, err)
}
}
}
func printFile(file string) error {
r, err := os.Open(file)
if err != nil {
return err
}
defer r.Close()
fr, err := goparquet.NewFileReader(r)
if err != nil {
return err
}
log.Printf("Printing file %s", file)
log.Printf("Schema: %s", fr.GetSchemaDefinition())
count := 0
for {
row, err := fr.NextRow()
if err == io.EOF {
break
}
if err != nil {
return fmt.Errorf("reading record failed: %w", err)
}
log.Printf("Record %d:", count)
for k, v := range row {
if vv, ok := v.([]byte); ok {
v = string(vv)
}
log.Printf("\t%s = %v", k, v)
}
count++
}
log.Printf("End of file %s (%d records)", file, count)
return nil
}