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ARROW-5109: [Go] implement reading binary/string arrays from Arrow file #4155

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ARROW-5109: [Go] implement reading binary/string arrays from Arrow file #4155

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13 changes: 13 additions & 0 deletions go/arrow/ipc/file_reader.go
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Original file line number Diff line number Diff line change
Expand Up @@ -361,6 +361,9 @@ func (ctx *arrayLoaderContext) loadArray(dt arrow.DataType) array.Interface {
*arrow.Float32Type, *arrow.Float64Type:
return ctx.loadPrimitive(dt)

case *arrow.BinaryType, *arrow.StringType:
return ctx.loadBinary(dt)

default:
panic(errors.Errorf("array type %T not handled yet", dt))
}
Expand Down Expand Up @@ -409,6 +412,16 @@ func (ctx *arrayLoaderContext) loadPrimitive(dt arrow.DataType) array.Interface
return array.MakeFromData(data)
}

func (ctx *arrayLoaderContext) loadBinary(dt arrow.DataType) array.Interface {
field, buffers := ctx.loadCommon(3)
buffers = append(buffers, ctx.buffer(), ctx.buffer())

data := array.NewData(dt, int(field.Length()), buffers, nil, int(field.NullCount()), 0)
defer data.Release()

return array.MakeFromData(data)
}

func readDictionary(meta *memory.Buffer, types dictTypeMap, r ReadAtSeeker) (int64, array.Interface, error) {
// msg := flatbuf.GetRootAsMessage(meta.Bytes(), 0)
// var dictBatch flatbuf.DictionaryBatch
Expand Down