[GitHub] [shardingsphere] sandynz opened a new issue, #24107: Support order by MySQL VARBINARY primary key

["sandynz (via GitHub)" <gi...@apache.org>]

sandynz opened a new issue, #24107:
URL: https://github.com/apache/shardingsphere/issues/24107

   ## Feature Request
   
   ### Is your feature request related to a problem?
   Yes
   
   ### Describe the feature you would like.
   MySQL is used, table primary key is VARBINARY type, it could be ordered in MySQL, but failed in ShardingSphere proxy and JDBC driver.
   The reason is VARBINARY column value type is byte array, it doesn't implement Comparable interface.
   
   Exception example:
   ```
   org.apache.shardingsphere.sharding.exception.data.NotImplementComparableValueException: Order by value must implements Comparable.
   	at org.apache.shardingsphere.sharding.merge.dql.orderby.OrderByValue.lambda$getOrderValues$0(OrderByValue.java:113)
   	at org.apache.shardingsphere.infra.util.exception.ShardingSpherePreconditions.checkState(ShardingSpherePreconditions.java:41)
   	at org.apache.shardingsphere.sharding.merge.dql.orderby.OrderByValue.getOrderValues(OrderByValue.java:113)
   	at org.apache.shardingsphere.sharding.merge.dql.orderby.OrderByValue.next(OrderByValue.java:105)
   	at org.apache.shardingsphere.sharding.merge.dql.orderby.OrderByStreamMergedResult.orderResultSetsToQueue(OrderByStreamMergedResult.java:57)
   	at org.apache.shardingsphere.sharding.merge.dql.orderby.OrderByStreamMergedResult.<init>(OrderByStreamMergedResult.java:50)
   	at org.apache.shardingsphere.sharding.merge.dql.ShardingDQLResultMerger.build(ShardingDQLResultMerger.java:100)
   	at org.apache.shardingsphere.sharding.merge.dql.ShardingDQLResultMerger.merge(ShardingDQLResultMerger.java:71)
   	at org.apache.shardingsphere.infra.merge.MergeEngine.executeMerge(MergeEngine.java:81)
   	at org.apache.shardingsphere.infra.merge.MergeEngine.merge(MergeEngine.java:71)
   ```
   
   Example table schema:
   ```
   CREATE TABLE `t_order` (
     `order_id` varbinary(64) NOT NULL,
     `user_id` int(11) NOT NULL,
     `status` varchar(255) DEFAULT NULL,
     PRIMARY KEY (`order_id`)
   ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
   ```
   
   Example query SQL:
   ```
   mysql> select * from t_order order by order_id limit 3;
   ERROR 20024 (44000): Order by value must implements Comparable.
   ```
   
   


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