[ARROW-18438] [Go] firstTimeBitmapWriter.Finish() panics with list of 8 structs

• Type: Bug
• Status: In Progress
• Priority: Critical
• Resolution: Unresolved
• Affects Version/s: 10.0.1
• Component/s: Go, Parquet
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/33600

Language

Go

• Assignee: Min-Young Wu
• Reporter: Min-Young Wu
• Created: 16/Dec/22 01:10
• Updated: 11/Jan/23 12:00

Description

Even after ARROW-17169 I still get a panic at the same location.

Below is a test case that panics:

func (ps *ParquetIOTestSuite) TestStructWithListOf8Structs() {
	bldr := array.NewStructBuilder(memory.DefaultAllocator, arrow.StructOf(
		arrow.Field{
			Name: "l",
			Type: arrow.ListOf(arrow.StructOf(
				arrow.Field{Name: "a", Type: arrow.BinaryTypes.String},
			)),
		},
	))
	defer bldr.Release()

	lBldr := bldr.FieldBuilder(0).(*array.ListBuilder)
	stBldr := lBldr.ValueBuilder().(*array.StructBuilder)
	aBldr := stBldr.FieldBuilder(0).(*array.StringBuilder)

	bldr.AppendNull()
	bldr.Append(true)
	lBldr.Append(true)
	for i := 0; i < 8; i++ {
		stBldr.Append(true)
		aBldr.Append(strconv.Itoa(i))
	}

	arr := bldr.NewArray()
	defer arr.Release()

	field := arrow.Field{Name: "x", Type: arr.DataType(), Nullable: true}
	expected := array.NewTable(arrow.NewSchema([]arrow.Field{field}, nil),
		[]arrow.Column{*arrow.NewColumn(field, arrow.NewChunked(field.Type, []arrow.Array{arr}))}, -1)
	defer expected.Release()

	ps.roundTripTable(expected, false)
}

I've tried to trim down the input data and this is as minimal as I could get it. And yes:

• wrapping struct with initial null is required
• the inner list needs to contain 8 structs (or any multiple of 8)

Issue Links

• links to: GitHub Pull Request #14989