omkenge commented on PR #1693:
URL: https://github.com/apache/iceberg-python/pull/1693#issuecomment-2673517716
**Issue:**
When no rows are updated (i.e., none of the source composite keys match the
target), the code calls pa.Table.from_arrays([], names=...). This passes 0
arrays for a schema that expects 6 arrays(origianl schema of table), causing
the error.
**ERROR**
```
rows_to_update = upsert_util.get_rows_to_update(df,
matched_iceberg_table, join_cols)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/workspaces/pyiceberg/pyiceberg/table/upsert_util.py", line 89, in
get_rows_to_update
rows_to_update_table = pa.Table.from_arrays([],
names=source_table.column_names)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "pyarrow/table.pxi", line 4851, in pyarrow.lib.Table.from_arrays
File "pyarrow/table.pxi", line 1593, in pyarrow.lib._sanitize_arrays
File "pyarrow/table.pxi", line 1557, in pyarrow.lib._schema_from_arrays
ValueError: Length of names (6) does not match length of arrays (0)
```
**Solution:**
Create an empty array for each column in the source schema:
```
empty_arrays = [pa.array([], type=field.type) for field in
source_table.schema]
rows_to_update_table = pa.Table.from_arrays(empty_arrays,
schema=source_table.schema)
```
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