TeslaCN commented on a change in pull request #11768:
URL: https://github.com/apache/shardingsphere/pull/11768#discussion_r686793688



##########
File path: 
shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-core/src/main/java/org/apache/shardingsphere/sharding/rule/ShardingRule.java
##########
@@ -207,7 +209,7 @@ public ShardingStrategyConfiguration 
getTableShardingStrategyConfiguration(final
      * @return table rule
      */
     public Optional<TableRule> findTableRule(final String logicTableName) {
-        return tableRules.stream().filter(each -> 
each.getLogicTable().equalsIgnoreCase(logicTableName)).findFirst();
+        return 
Optional.ofNullable(tableRules.getOrDefault(logicTableName.toLowerCase(), 
null));

Review comment:
       ```suggestion
           return 
Optional.ofNullable(tableRules.get(logicTableName.toLowerCase()));
   ```




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