feat: add Postgres SQL validator (#11538)

* Add Postgres SQL validator

* Strip line number from message

* Add unit tests

* Run tests only with postgres backend

* Add dep

* Add dep to bashlib

superset/sql_validators/postgres.py

@@ -0,0 +1,54 @@
+# 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.
+
+import re
+from typing import List, Optional
+
+from pgsanity.pgsanity import check_string
+
+from superset.models.core import Database
+from superset.sql_validators.base import BaseSQLValidator, SQLValidationAnnotation
+
+
+class PostgreSQLValidator(BaseSQLValidator):  # pylint: disable=too-few-public-methods
+    """Validate SQL queries using the pgsanity module"""
+
+    name = "PostgreSQLValidator"
+
+    @classmethod
+    def validate(
+        cls, sql: str, schema: Optional[str], database: Database
+    ) -> List[SQLValidationAnnotation]:
+        annotations: List[SQLValidationAnnotation] = []
+        valid, error = check_string(sql, add_semicolon=True)
+        if valid:
+            return annotations
+
+        match = re.match(r"^line (\d+): (.*)", error)
+        line_number = int(match.group(1)) if match else None
+        message = match.group(2) if match else error
+
+        annotations.append(
+            SQLValidationAnnotation(
+                message=message,
+                line_number=line_number,
+                start_column=None,
+                end_column=None,
+            )
+        )
+
+        return annotations