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Merge pull request #350 from xitongsys/dev
use x01 instead of . as the delimiter
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "log" | ||
|
|
||
| "github.com/xitongsys/parquet-go-source/local" | ||
| "github.com/xitongsys/parquet-go/parquet" | ||
| "github.com/xitongsys/parquet-go/reader" | ||
| "github.com/xitongsys/parquet-go/writer" | ||
| ) | ||
|
|
||
| type A struct { | ||
| V1 int32 `parquet:"name=b.c, type=INT32, encoding=PLAIN"` | ||
| V2 B `parquet:"name=b"` | ||
| V3 int32 `parquet:"name=c, type=INT32, encoding=PLAIN"` | ||
| } | ||
|
|
||
| type B struct { | ||
| C int32 `parquet:"name=c, type=INT32, encoding=PLAIN"` | ||
| } | ||
|
|
||
| func main() { | ||
| var err error | ||
| fw, err := local.NewLocalFileWriter("a.parquet") | ||
| if err != nil { | ||
| log.Println("Can't create local file", err) | ||
| return | ||
| } | ||
|
|
||
| //write | ||
| pw, err := writer.NewParquetWriter(fw, new(A), 4) | ||
| if err != nil { | ||
| log.Println("Can't create parquet writer", err) | ||
| return | ||
| } | ||
|
|
||
| pw.RowGroupSize = 128 * 1024 * 1024 //128M | ||
| pw.PageSize = 8 * 1024 //8K | ||
| pw.CompressionType = parquet.CompressionCodec_SNAPPY | ||
| num := 10 | ||
| for i := 0; i < num; i++ { | ||
| o := A{ | ||
| V1: 1, | ||
| V2: B{ | ||
| C: 2, | ||
| }, | ||
| V3: 3, | ||
| } | ||
| if err = pw.Write(o); err != nil { | ||
| log.Println("Write error", err) | ||
| } | ||
| } | ||
| if err = pw.WriteStop(); err != nil { | ||
| log.Println("WriteStop error", err) | ||
| return | ||
| } | ||
| log.Println("Write Finished") | ||
| fw.Close() | ||
|
|
||
| ///read all | ||
| fr, err := local.NewLocalFileReader("a.parquet") | ||
| if err != nil { | ||
| log.Println("Can't open file") | ||
| return | ||
| } | ||
|
|
||
| pr, err := reader.NewParquetReader(fr, new(A), 4) | ||
| if err != nil { | ||
| log.Println("Can't create parquet reader", err) | ||
| return | ||
| } | ||
| num = int(pr.GetNumRows()) | ||
| os := make([]A, num) | ||
|
|
||
| if err = pr.Read(&os); err != nil { | ||
| log.Println("Read error", err) | ||
| } | ||
| log.Println(os) | ||
|
|
||
| pr.ReadStop() | ||
| fr.Close() | ||
|
|
||
| ///read column by path | ||
| fr, err = local.NewLocalFileReader("a.parquet") | ||
| if err != nil { | ||
| log.Println("Can't open file") | ||
| return | ||
| } | ||
|
|
||
| pr, err = reader.NewParquetReader(fr, new(A), 4) | ||
| if err != nil { | ||
| log.Println("Can't create parquet reader", err) | ||
| return | ||
| } | ||
| cn := pr.GetNumRows() | ||
| v1, _, _, _ := pr.ReadColumnByPath("parquet_go_root\x01b.c",cn) | ||
| v2, _, _, _ := pr.ReadColumnByPath("parquet_go_root\x01b\x01c",cn) | ||
| v3, _, _, _ := pr.ReadColumnByPath("parquet_go_root\x01c", cn) | ||
| log.Println(v1,v2,v3) | ||
|
|
||
| pr.ReadStop() | ||
| fr.Close() | ||
| } |
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