Bugfix: Add brackets around WHERE clause

data_diff/__main__.py

@@ -185,7 +185,7 @@ def write_usage(self, prog: str, args: str = "", prefix: Optional[str] = None) -
     metavar="COUNT",
 )
 @click.option(
-    "-w", "--where", default=None, help="An additional 'where' expression to restrict the search space.", metavar="EXPR"
+    "-w", "--where", default=None, help="An additional 'where' expression to restrict the search space. Beware of SQL Injection!", metavar="EXPR"
 )
 @click.option("-a", "--algorithm", default=Algorithm.AUTO.value, type=click.Choice([i.value for i in Algorithm]))
 @click.option(

data_diff/joindiff_tables.py

@@ -253,7 +253,7 @@ def _test_null_keys(self, table1, table2):
             q = t.select(*this[key_columns]).where(or_(this[k] == None for k in key_columns))
             nulls = ts.database.query(q, list)
             if nulls:
-                raise ValueError("NULL values in one or more primary keys")
+                raise ValueError(f"NULL values in one or more primary keys of {ts.table_path}")
 
     def _collect_stats(self, i, table_seg: TableSegment, info_tree: InfoTree):
         logger.debug(f"Collecting stats for table #{i}")

data_diff/table_segment.py

@@ -67,8 +67,11 @@ def __post_init__(self):
                 f"Error: min_update expected to be smaller than max_update! ({self.min_update} >= {self.max_update})"
             )
 
+    def _where(self):
+        return f"({self.where})" if self.where else None
+
     def _with_raw_schema(self, raw_schema: dict) -> "TableSegment":
-        schema = self.database._process_table_schema(self.table_path, raw_schema, self.relevant_columns, self.where)
+        schema = self.database._process_table_schema(self.table_path, raw_schema, self.relevant_columns, self._where())
         return self.new(_schema=create_schema(self.database, self.table_path, schema, self.case_sensitive))
 
     def with_schema(self) -> "TableSegment":
@@ -100,7 +103,7 @@ def source_table(self):
 
     def make_select(self):
         return self.source_table.where(
-            *self._make_key_range(), *self._make_update_range(), Code(self.where) if self.where else SKIP
+            *self._make_key_range(), *self._make_update_range(), Code(self._where()) if self.where else SKIP
         )
 
     def get_values(self) -> list:

tests/test_api.py

@@ -49,7 +49,7 @@ def test_api(self):
 
         # test where
         diff_id = diff[0][1][0]
-        where = f"id != {diff_id}"
+        where = f"id != {diff_id} OR id = 90000000"
 
         t1 = connect_to_table(TEST_MYSQL_CONN_STRING, self.table_src_name, where=where)
         t2 = connect_to_table(TEST_MYSQL_CONN_STRING, self.table_dst_name, where=where)