cloud-fan commented on code in PR #57720:
URL: https://github.com/apache/spark/pull/57720#discussion_r3704773993


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sql/core/src/main/scala/org/apache/spark/sql/jdbc/MySQLDialect.scala:
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@@ -221,7 +221,35 @@ private case class MySQLDialect() extends JdbcDialect with 
SQLConfHelper with No
 
   // See 
https://dev.mysql.com/doc/mysql-errors/8.0/en/server-error-reference.html
   override def isSyntaxErrorBestEffort(exception: SQLException): Boolean = {
-    "42000".equals(exception.getSQLState)
+    "42000".equals(exception.getSQLState) &&
+    !isNonSyntaxErrorBestEffort(exception)

Review Comment:
   `true` must mean this is confidently a syntax error, but the denylist still 
lets documented non-syntax 42000 errors through. For example, [ER_BAD_DB_ERROR 
(1049)](https://dev.mysql.com/doc/mysql-errors/8.0/en/server-error-reference.html#error_er_bad_db_error)
 is `42000` with message `Unknown database`, so this path returns `true`. 
Please use an allowlist of vendor codes known to represent syntax errors 
(including 1064), and add 1049 as a regression case.



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