sunxiaoguang commented on code in PR #49453:
URL: https://github.com/apache/spark/pull/49453#discussion_r1960747431
##########
connector/docker-integration-tests/src/test/scala/org/apache/spark/sql/jdbc/v2/MySQLIntegrationSuite.scala:
##########
@@ -264,4 +342,10 @@ class MySQLOverMariaConnectorIntegrationSuite extends
MySQLIntegrationSuite {
s"jdbc:mysql://$ip:$port/mysql?user=root&password=rootpass&allowPublicKeyRetrieval=true"
+
s"&useSSL=false"
}
+
+ // MariaDB Connector/J uses collation 'utf8mb4_unicode_ci' as collation for
connection.
+ // The MySQL server 9.1.0 uses collation 'utf8mb4_0900_ai_ci' for database
by default.
+ // This method uses string literal so the result of cast and literal have
the same collation.
+ override def testCastStringTarget(stringLiteral: String, stringCol: String):
String =
Review Comment:
Or in other words, it is due to compatibility issue between MariaDB JDBC and
MySQL Server 9.
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