Unable to merge uppercase column names

[gdubya]

Environment

Delta-rs version:
python = "^3.11"
deltalake = "^0.13.0"
pandas = "^2.1.3"

Environment:

• OS: Ubuntu

---

Bug

What happened:
_internal.DeltaError: Generic DeltaTable error: Schema error: No field named source.y. Valid fields are source.x, source."Y", source.__delta_rs_source, target.x, target."Y", target.__delta_rs_target.

What you expected to happen:
Successful merge.

How to reproduce it:

    from deltalake import DeltaTable, write_deltalake
    import pyarrow as pa
    data = pa.table({"x": [1, 2, 3], "Y": [4, 5, 6]})
    write_deltalake(tmp_path, data)
    dt = DeltaTable(tmp_path)
    new_data = pa.table({"x": [1], "Y": [7]})
    (
        dt.merge(
            source=new_data,
            predicate="target.x = source.x",
            source_alias="source",
            target_alias="target")
        .when_matched_update_all()
        .execute()
    )

More details:
Note that the delta table was originally created with an uppercase Y column. This was intentional.

[ion-elgreco]

This is already tracked here: #1797

And a fix is on its way: #1954

[ion-elgreco]

@gdubya btw, i suggest upgrading to 0.14.0 it's way faster (the case bug is still there though in that release)

[gdubya]

@ion-elgreco Ah, sorry. I did a quick search but didn't see that one. Thanks!

[ion-elgreco]

@gdubya no worries! Hopefully soon in a small 0.14.1 release we can release the fix