[jira] [Created] (ARROW-18438) [Go] firstTimeBitmapWriter.Finish() panics with 8n structs

["Min-Young Wu (Jira)" <ji...@apache.org>]

Min-Young Wu created ARROW-18438:
------------------------------------

             Summary: [Go] firstTimeBitmapWriter.Finish() panics with 8n structs
                 Key: ARROW-18438
                 URL: https://issues.apache.org/jira/browse/ARROW-18438
             Project: Apache Arrow
          Issue Type: Bug
          Components: Go, Parquet
    Affects Versions: 10.0.1
            Reporter: Min-Young Wu


Even after [ARROW-17169|https://issues.apache.org/jira/browse/ARROW-17169] I still get a panic at the same location.

Below is a test case that panics:
{code:go}
func (ps *ParquetIOTestSuite) TestStructWithNullableListOfStructs() {
	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)
}
{code}

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)



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