[Py testing] Add helper function for cross-validation

python/tests/helpers.py

@@ -4,6 +4,7 @@
 # Copyright 2022 Intel Corporation.
 #
 # SPDX-License-Identifier: Apache-2.0
+import pandas as pd
 
 
 def check_schema(schema, expected):
@@ -26,3 +27,52 @@ def check_res(res, expected):
                 assert abs(expected_val - actual_val) < 0.0001
             else:
                 assert expected_val == actual_val
+
+
+def compare_tables(
+    left_df: pd.DataFrame, right_df: pd.DataFrame, try_to_guess: bool = False
+):
+    left_cols = left_df.columns.to_list()
+    right_cols = right_df.columns.to_list()
+    left_cols.sort()
+    right_cols.sort()
+
+    diff_idx = [
+        idx for idx, col_name in enumerate(right_cols) if col_name != left_cols[idx]
+    ]
+
+    print("compare lists: ", diff_idx)
+    drop_left = []
+    drop_right = []
+    for drop_idx in diff_idx:
+        drop_left += [left_cols[drop_idx]]
+        drop_right += [right_cols[drop_idx]]
+    if try_to_guess:
+        right_df = right_df.rename(columns=dict(zip(drop_right, drop_left)))
+    else:
+        left_df = left_df.drop(columns=drop_left)
+        right_df = right_df.drop(columns=drop_right)
+
+    left_cols = left_df.columns.to_list()
+    right_cols = right_df.columns.to_list()
+    left_cols.sort()
+    right_cols.sort()
+
+    assert left_cols == right_cols, "Table column names are different"
+
+    left_df.sort_values(by=left_cols, inplace=True)
+    right_df.sort_values(by=left_cols, inplace=True)
+    for col in left_df.columns:
+        if left_df[col].dtype in ["category"]:
+            left_df[col] = left_df[col].astype("str")
+            right_df[col] = right_df[col].astype("str")
+
+    left_df = left_df.reset_index(drop=True)
+    right_df = right_df.reset_index(drop=True)
+    if not all(left_df == right_df):
+        mask = left_df == right_df
+        print("Mismathed left: ")
+        print(left_df[mask])
+        print("         right: ")
+        print(left_df[mask])
+        raise RuntimeError("Results mismatched")