[BUG] Internal server error on incorrect syntax

What is the bug?

{
    "datasource" : "mys3",
    "lang" : "sql",
    "query" : "ALTER MATERIALIZED VIEW mys3.default.`mv-v10` WITH (auto_refresh = false)"
}

{
  "status": 500,
  "error": {
    "type": "SyntaxCheckException",
    "reason": "There was internal problem at backend",
    "details": "Failed to parse query due to offending symbol [MATERIALIZED] at: \u0027ALTER MATERIALIZED\u0027 \u003c--- HERE... More details: Expecting tokens in {\u0027(\u0027, \u0027ADD\u0027, \u0027ALTER\u0027, \u0027ANALYZE\u0027, \u0027CACHE\u0027, \u0027CALL\u0027, \u0027CLEAR\u0027, \u0027COMMENT\u0027, \u0027COMMIT\u0027, \u0027CREATE\u0027, \u0027DECLARE\u0027, \u0027DELETE\u0027, \u0027DESC\u0027, \u0027DESCRIBE\u0027, \u0027DFS\u0027, \u0027DROP\u0027, \u0027EXPLAIN\u0027, \u0027EXPORT\u0027, \u0027FROM\u0027, \u0027GRANT\u0027, \u0027IMPORT\u0027, \u0027INSERT\u0027, \u0027LIST\u0027, \u0027LOAD\u0027, \u0027LOCK\u0027, \u0027MAP\u0027, \u0027MERGE\u0027, \u0027MSCK\u0027, \u0027REDUCE\u0027, \u0027REFRESH\u0027, \u0027REPAIR\u0027, \u0027REPLACE\u0027, \u0027REVOKE\u0027, \u0027ROLLBACK\u0027, \u0027SELECT\u0027, \u0027SET\u0027, \u0027SHOW\u0027, \u0027START\u0027, \u0027TABLE\u0027, \u0027EXECUTE\u0027, \u0027TRUNCATE\u0027, \u0027UNCACHE\u0027, \u0027UNLOCK\u0027, \u0027UPDATE\u0027, \u0027USE\u0027, \u0027VALUES\u0027, \u0027WITH\u0027}"
  }
}

Expectation
return 400 validation exception

Start by reproducing the shown SQL validation request and trace how SyntaxCheckException is converted into the HTTP response. Done means this malformed ALTER MATERIALIZED VIEW request returns a 400 validation exception instead of a 500 internal server error; no file or test location is named in the issue.