[
https://issues.apache.org/jira/browse/ARROW-16749?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Matthew Topol resolved ARROW-16749.
-----------------------------------
Fix Version/s: 9.0.0
Resolution: Fixed
Issue resolved by pull request 13310
[https://github.com/apache/arrow/pull/13310]
> [Go] Bug when converting from Arrow to Parquet from null array
> --------------------------------------------------------------
>
> Key: ARROW-16749
> URL: https://issues.apache.org/jira/browse/ARROW-16749
> Project: Apache Arrow
> Issue Type: Bug
> Components: Go
> Affects Versions: 9.0.0
> Reporter: Alexandre Crayssac
> Assignee: Alexandre Crayssac
> Priority: Minor
> Labels: pull-request-available
> Fix For: 9.0.0
>
> Time Spent: 2h
> Remaining Estimate: 0h
>
> Hello world,
> When converting from Arrow to Parquet it looks like there is a bug with
> arrays of type {{{}arrow.NULL{}}}. Here is a snippet of code to reproduce the
> bug:
>
> {code:java}
> package main
> import (
> "fmt"
> "log"
> "os"
> "github.com/apache/arrow/go/v9/arrow"
> "github.com/apache/arrow/go/v9/arrow/array"
> "github.com/apache/arrow/go/v9/arrow/memory"
> "github.com/apache/arrow/go/v9/parquet/pqarrow"
> )
> const n = 10
> func run() error {
> schema := arrow.NewSchema(
> []arrow.Field{
> {Name: "f1", Type: arrow.Null, Nullable: true},
> },
> nil,
> )
> rb := array.NewRecordBuilder(memory.DefaultAllocator, schema)
> defer rb.Release()
> for i := 0; i < n; i++ {
> rb.Field(0).(*array.NullBuilder).AppendNull()
> }
> rec := rb.NewRecord()
> defer rec.Release()
> for i, col := range rec.Columns() {
> fmt.Printf("column[%d] %q: %v\n", i, rec.ColumnName(i), col)
> }
> f, err := os.Create("output.parquet")
> if err != nil {
> return err
> }
> defer f.Close()
> w, err := pqarrow.NewFileWriter(rec.Schema(), f, nil,
> pqarrow.DefaultWriterProps())
> if err != nil {
> return err
> }
> defer w.Close()
> err = w.Write(rec)
> if err != nil {
> return err
> }
> return nil
> }
> func main() {
> if err := run(); err != nil {
> log.Fatal(err)
> }
> } {code}
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