workaround for Maria reporting that "string" is a keyword

Signed-off-by: Gavin King <gavin@hibernate.org>

hibernate-core/src/main/java/org/hibernate/dialect/MariaDBDialect.java

@@ -111,6 +111,15 @@ public class MariaDBDialect extends MySQLDialect {
 		}
 	}
 
+	@Override
+	protected void registerKeyword(String word) {
+		// The MariaDB driver reports that "STRING" is a keyword, but
+		// it's not a reserved word, and a column may be named STRING
+		if ( !"string".equalsIgnoreCase(word) ) {
+			super.registerKeyword(word);
+		}
+	}
+
 	@Override
 	public JdbcType resolveSqlTypeDescriptor(
 			String columnTypeName,