fix(OpenSearch): OpenSearch dialect for sqlglot (#39538)

superset/sql/dialects/opensearch.py

@@ -0,0 +1,34 @@
+# 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.
+
+"""
+OpenSearch SQL dialect.
+
+OpenSearch SQL is syntactically close to MySQL but accepts both backticks and
+double-quotes as identifier delimiters. Treating ``"`` as an identifier (rather
+than a string delimiter, as MySQL does) is what keeps mixed-case column names
+from being emitted as string literals after a SQLGlot round-trip.
+"""
+
+from __future__ import annotations
+
+from sqlglot.dialects.mysql import MySQL
+
+
+class OpenSearch(MySQL):
+    class Tokenizer(MySQL.Tokenizer):
+        IDENTIFIERS = ['"', "`"]