init

main.go

@@ -0,0 +1,96 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"log/slog"
+	"os"
+
+	"github.com/xitongsys/parquet-go-source/local"
+	"github.com/xitongsys/parquet-go/parquet"
+	"github.com/xitongsys/parquet-go/writer"
+)
+
+func main() {
+	t := flag.String("type", "csv", "")
+	rows := flag.Int("amount", 1000, "")
+
+	flag.Parse()
+
+	slog.Info("Running", "type", *t, "rows", *rows)
+
+	switch *t {
+	case "csv":
+		err := writeCSV(*rows)
+		if err != nil {
+			log.Fatal(err)
+		}
+	case "parquet":
+		err := writeParquet(*rows)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+}
+
+func writeCSV(rows int) error {
+	const filename = "output.csv"
+
+	f, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+
+	for i := 0; i < rows; i++ {
+		_, err := fmt.Fprintf(f, "%d,ice hockey,pizza", i)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+type Row struct {
+	ID    int    `parquet:"name=id, type=INT32, encoding=PLAIN"`
+	Sport string `parquet:"name=sport, type=BYTE_ARRAY, convertedtype=UTF8, encoding=PLAIN_DICTIONARY"`
+	Food  string `parquet:"name=food, type=BYTE_ARRAY, convertedtype=UTF8, encoding=PLAIN_DICTIONARY"`
+}
+
+func writeParquet(rows int) error {
+	const filename = "output.parquet"
+
+	fw, err := local.NewLocalFileWriter(filename)
+	if err != nil {
+		return fmt.Errorf("failed to NewLocalFileWriter %w", err)
+	}
+
+	// write
+	pw, err := writer.NewParquetWriter(fw, new(Row), 4)
+	if err != nil {
+		return fmt.Errorf("failed to NewParquertWriter %w", err)
+	}
+
+	pw.RowGroupSize = 128 * 1024 * 1024 // 128M
+	pw.CompressionType = parquet.CompressionCodec_SNAPPY
+
+	for i := 0; i < rows; i++ {
+		r := Row{
+			ID:    i,
+			Food:  "pizza",
+			Sport: "ice hockey",
+		}
+		if err = pw.Write(r); err != nil {
+			return fmt.Errorf("failed to Write %w", err)
+		}
+	}
+
+	if err = pw.WriteStop(); err != nil {
+		return fmt.Errorf("failed to WriteStop %w", err)
+	}
+
+	fw.Close()
+
+	return nil
+}