minyoung commented on issue #35202:
URL: https://github.com/apache/arrow/issues/35202#issuecomment-1526790176
Thanks for having a look @zeroshade!
Some of the panics are gone now 🎉
Unsure if related or not but we do get a panic with a slightly more
populated version of our dataset:
```golang
func (ps *ParquetIOTestSuite) TestNestedEmptyList() {
bldr := array.NewStructBuilder(memory.DefaultAllocator, arrow.StructOf(
arrow.Field{
Nullable: true,
Name: "root",
Type: arrow.StructOf(
arrow.Field{
Nullable: true,
Name: "child1",
Type: arrow.ListOf(arrow.StructOf(
arrow.Field{
Nullable: true,
Name: "child2",
Type:
arrow.ListOf(arrow.StructOf(
arrow.Field{
Nullable: true,
Name:
"name",
Type:
arrow.BinaryTypes.String,
},
)),
},
)),
},
),
},
))
defer bldr.Release()
rootBldr := bldr.FieldBuilder(0).(*array.StructBuilder)
child1Bldr := rootBldr.FieldBuilder(0).(*array.ListBuilder)
child1ElBldr := child1Bldr.ValueBuilder().(*array.StructBuilder)
child2Bldr := child1ElBldr.FieldBuilder(0).(*array.ListBuilder)
leafBldr := child2Bldr.ValueBuilder().(*array.StructBuilder)
nameBldr := leafBldr.FieldBuilder(0).(*array.StringBuilder)
// target structure 8 times
// {
// "root": {
// "child1": [
// { "child2": [{ "name": "foo" }] },
// { "child2": [] }
// ]
// }
// }
for i := 0; i < 8; i++ {
bldr.Append(true)
rootBldr.Append(true)
child1Bldr.Append(true)
child1ElBldr.Append(true)
child2Bldr.Append(true)
leafBldr.Append(true)
nameBldr.Append("foo")
child1ElBldr.Append(true)
child2Bldr.Append(true)
}
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)
}
```
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