[GitHub] [shardingsphere] RaigorJiang commented on a change in pull request #15551: Add a syntax SHOW SHARDING TABLE RULES USED ALGORITHM

[GitBox <gi...@apache.org>]

RaigorJiang commented on a change in pull request #15551:
URL: https://github.com/apache/shardingsphere/pull/15551#discussion_r813579705



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File path: shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-distsql/shardingsphere-sharding-distsql-handler/src/main/java/org/apache/shardingsphere/sharding/distsql/handler/query/ShardingTableRulesUsedAlgorithmQueryResultSet.java
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@@ -0,0 +1,85 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.shardingsphere.sharding.distsql.handler.query;
+
+import org.apache.shardingsphere.infra.distsql.query.DistSQLResultSet;
+import org.apache.shardingsphere.infra.metadata.ShardingSphereMetaData;
+import org.apache.shardingsphere.sharding.api.config.ShardingRuleConfiguration;
+import org.apache.shardingsphere.sharding.distsql.parser.statement.ShowShardingTableRulesUsedAlgorithmStatement;
+import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.List;
+
+/**
+ * Result set for show sharding table rules used algorithm.
+ */
+public final class ShardingTableRulesUsedAlgorithmQueryResultSet implements DistSQLResultSet {
+
+    private Iterator<Collection<Object>> data = Collections.emptyIterator();
+
+    @Override
+    public void init(final ShardingSphereMetaData metaData, final SQLStatement sqlStatement) {
+        ShowShardingTableRulesUsedAlgorithmStatement statement = (ShowShardingTableRulesUsedAlgorithmStatement) sqlStatement;
+        List<Collection<Object>> result = new ArrayList<>();
+        Collection<ShardingRuleConfiguration> shardingTableRules = metaData.getRuleMetaData().findRuleConfiguration(ShardingRuleConfiguration.class);
+        shardingTableRules.forEach(each -> requireResult(statement, metaData.getName(), result, each));
+        data = result.iterator();
+    }
+
+    private void requireResult(final ShowShardingTableRulesUsedAlgorithmStatement statement, final String schemaName, final List<Collection<Object>> result,
+                               final ShardingRuleConfiguration shardingRuleConfiguration) {
+        if (!statement.getAlgorithmName().isPresent()) {
+            return;
+        }
+        shardingRuleConfiguration.getTables().forEach(each -> {
+            if (null != each.getTableShardingStrategy() && statement.getAlgorithmName().get().equals(each.getTableShardingStrategy().getShardingAlgorithmName())) {

Review comment:
       Hi @leedongyang , `databaseShardingStrategy` also needs to be checked here.




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