tustvold commented on code in PR #1794:
URL: https://github.com/apache/arrow-rs/pull/1794#discussion_r889964435
##########
arrow/src/ipc/writer.rs:
##########
@@ -1433,4 +1443,68 @@ mod tests {
},
);
}
+
+ fn write_union_file(options: IpcWriteOptions) {
+ let schema = Schema::new(vec![Field::new(
+ "union",
+ DataType::Union(
+ vec![
+ Field::new("a", DataType::Int32, false),
+ Field::new("c", DataType::Float64, false),
+ ],
+ vec![0, 1],
+ UnionMode::Sparse,
+ ),
+ true,
+ )]);
+ let mut builder = UnionBuilder::new_sparse(5);
+ builder.append::<Int32Type>("a", 1).unwrap();
+ builder.append_null::<Int32Type>("a").unwrap();
+ builder.append::<Float64Type>("c", 3.0).unwrap();
+ builder.append_null::<Float64Type>("c").unwrap();
+ builder.append::<Int32Type>("a", 4).unwrap();
+ let union = builder.build().unwrap();
+
+ let batch = RecordBatch::try_new(
+ Arc::new(schema.clone()),
+ vec![Arc::new(union) as ArrayRef],
+ )
+ .unwrap();
+ let file_name = "target/debug/testdata/union.arrow_file";
+ {
+ let file = File::create(&file_name).unwrap();
+ let mut writer =
+ FileWriter::try_new_with_options(file, &schema,
options).unwrap();
+
+ writer.write(&batch).unwrap();
+ writer.finish().unwrap();
+ }
+
+ {
+ let file = File::open(&file_name).unwrap();
+ let reader = FileReader::try_new(file, None).unwrap();
Review Comment:
Not sure how hard this would be to test, but perhaps we should test what
null mask is actually written (I think the reader simply ignores it)
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