community[patch]: Don't set search path for unknown SQL dialects (#16047)

- **Description:** Made a small fix for the `SQLDatabase` highlighted in
an issue. The issue pertains to switching schema for different SQL
engines. 
  - **Issue:** #16023
@baskaryan

libs/community/langchain_community/utilities/sql_database.py

@@ -409,8 +409,9 @@ class SQLDatabase:
                     # If anybody using Sybase SQL anywhere database then it should not
                     # go to else condition. It should be same as mssql.
                     pass
-                else:  # postgresql and other compatible dialects
+                elif self.dialect == "postgresql":  # postgresql
                     connection.exec_driver_sql("SET search_path TO %s", (self._schema,))
+
             cursor = connection.execute(text(command))
             if cursor.returns_rows:
                 if fetch == "all":