added a check for generated exp in schema evolution

Signed-off-by: JustinRush80 <[email protected]>

python/tests/test_generated_columns.py

@@ -223,6 +223,34 @@ def test_merge_with_g_during_schema_evolution(
     assert table_with_gc.to_pyarrow_table() == expected_data
 
 
+def test_raise_when_gc_passed_merge_statement_during_schema_evolution(
+    tmp_path, data_without_gc, valid_gc_data
+):
+    write_deltalake(
+        tmp_path,
+        mode="append",
+        data=data_without_gc,
+    )
+    dt = DeltaTable(tmp_path)
+    assert dt.protocol().min_writer_version == 2
+
+    with pytest.raises(
+        SchemaMismatchError,
+        match="Schema evolved fields cannot have generated expressions. Recreate the table to achieve this.",
+    ):
+        (
+            dt.merge(
+                valid_gc_data,
+                predicate="s.id = t.id",
+                source_alias="s",
+                target_alias="t",
+                merge_schema=True,
+            )
+            .when_not_matched_insert_all()
+            .execute()
+        )
+
+
 def test_merge_with_gc_invalid(table_with_gc: DeltaTable, invalid_gc_data):
     import re