TeslaCN commented on code in PR #19371:
URL: https://github.com/apache/shardingsphere/pull/19371#discussion_r925104825


##########
shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/text/distsql/ral/queryable/ConvertYamlConfigurationHandler.java:
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@@ -67,61 +64,75 @@ protected Collection<LocalDataQueryResultRow> getRows(final 
ContextManager conte
         } catch (final IOException ex) {
             throw new ShardingSphereException(ex);
         }
-        String convertedDistSQL = generateConvertedDistSQL(yamlConfig);
-        return Collections.singleton(new 
LocalDataQueryResultRow(convertedDistSQL));
+        Preconditions.checkNotNull(yamlConfig, String.format("Invalid yaml 
file `%s`", file.getName()));

Review Comment:
   Consider replacing String.format with Preconditions' method with template.



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