terrymanu commented on a change in pull request #4826: issue-4785: Check 
uniformed with all actual tables' meta data in once when loading them
URL: 
https://github.com/apache/incubator-shardingsphere/pull/4826#discussion_r394330908
 
 

 ##########
 File path: 
sharding-core/sharding-core-common/src/main/java/org/apache/shardingsphere/core/metadata/ShardingMetaDataLoader.java
 ##########
 @@ -103,17 +104,25 @@ private SchemaMetaData loadDefaultSchemaMetaData() 
throws SQLException {
         return actualDefaultDataSourceName.isPresent()
                 ? 
SchemaMetaDataLoader.load(dataSourceMap.get(actualDefaultDataSourceName.get()), 
maxConnectionsSizePerQuery) : new SchemaMetaData(Collections.emptyMap());
     }
-    
-    // TODO check all meta data in once
+
     private void checkUniformed(final String logicTableName, final Map<String, 
TableMetaData> actualTableMetaDataMap) {
         ShardingTableMetaDataDecorator decorator = new 
ShardingTableMetaDataDecorator();
         TableMetaData sample = 
decorator.decorate(actualTableMetaDataMap.values().iterator().next(), 
logicTableName, shardingRule);
+        List<TableMetaDataViolation> metaDataViolationList = new 
LinkedList<>();
 
 Review comment:
   If for each only, maybe we can replace `List` as `Collection`

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