feat: generate label map on the backend (#21124)

tests/unit_tests/pandas_postprocessing/test_utils.py

@@ -0,0 +1,30 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+from superset.utils.pandas_postprocessing import escape_separator, unescape_separator
+
+
+def test_escape_separator():
+    assert escape_separator(r" hell \world ") == r" hell \world "
+    assert unescape_separator(r" hell \world ") == r" hell \world "
+
+    escape_string = escape_separator("hello, world")
+    assert escape_string == r"hello\, world"
+    assert unescape_separator(escape_string) == "hello, world"
+
+    escape_string = escape_separator("hello,world")
+    assert escape_string == r"hello\,world"
+    assert unescape_separator(escape_string) == "hello,world"