Omega359 commented on issue #15394:
URL: https://github.com/apache/datafusion/issues/15394#issuecomment-2764244381
I've been trying to find where to resolve this issue but my understanding of
the core of DF is currently too limited to uncover a solution. I've created a
test though that exhibits the issue
```Rust
#[tokio::test]
async fn union_by_name_literal_is_null_and_not_null() -> Result<()> {
let str_array_1 = StringArray::from(vec![Some("a1")]);
let str_array_2 = StringArray::from(vec![Some("a2")]);
let str_array_3 = StringArray::from(vec![Some("b1")]);
let batch_1 = RecordBatch::try_from_iter(vec![
("a", Arc::new(str_array_1) as ArrayRef),
])?;
let batch_2 = RecordBatch::try_from_iter(vec![
("a", Arc::new(str_array_2) as ArrayRef),
("b", Arc::new(str_array_3) as ArrayRef),
])?;
let ctx = SessionContext::new();
ctx.register_batch("union_batch_1", batch_1)?;
ctx.register_batch("union_batch_2", batch_2)?;
let df1 = ctx.table("union_batch_1").await?;
let df2 = ctx.table("union_batch_2").await?;
let batches = df2.union_by_name(df1)?.collect().await?;
let schema = batches[0].schema();
for batch in batches {
// Verify schema is the same for all batches
if !schema.contains(&batch.schema()) {
return Err(DataFusionError::Internal(
format!(
"Schema mismatch. Previously had\n{:#?}\n\nGot:\n{:#?}",
&schema,
batch.schema()
),
));
}
}
Ok(())
}
```
Above is based upon https://github.com/apache/datafusion/pull/15489
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