[GitHub] [shardingsphere] tuichenchuxin commented on a diff in pull request #21456: Support using federation to query ShardingSphere data.

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

tuichenchuxin commented on code in PR #21456:
URL: https://github.com/apache/shardingsphere/pull/21456#discussion_r992126327


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kernel/sql-federation/optimizer/src/main/java/org/apache/shardingsphere/sqlfederation/optimizer/executor/ShardingSphereDataFederationQueryEngine.java:
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@@ -0,0 +1,76 @@
+/*
+ * 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.sqlfederation.optimizer.executor;
+
+import org.apache.calcite.config.CalciteConnectionProperty;
+import org.apache.calcite.config.NullCollation;
+import org.apache.calcite.jdbc.CalciteConnection;
+import org.apache.calcite.schema.SchemaPlus;
+import org.apache.shardingsphere.infra.metadata.ShardingSphereMetaData;
+import org.apache.shardingsphere.infra.metadata.data.ShardingSphereDatabaseData;
+import org.apache.shardingsphere.infra.metadata.data.ShardingSphereSchemaData;
+import org.apache.shardingsphere.infra.metadata.data.ShardingSphereTableData;
+import org.apache.shardingsphere.infra.metadata.data.query.ShardingSphereDataQueryEngine;
+import org.apache.shardingsphere.infra.metadata.database.schema.decorator.model.ShardingSphereSchema;
+import org.apache.shardingsphere.sqlfederation.optimizer.metadata.memory.MemorySchema;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Properties;
+
+/**
+ * ShardingSphere data federation query engine.
+ */
+public final class ShardingSphereDataFederationQueryEngine implements ShardingSphereDataQueryEngine {
+    
+    private ShardingSphereMetaData metaData;
+    
+    private Map<String, ShardingSphereDatabaseData> databaseData;
+    
+    @Override
+    public void init(final ShardingSphereMetaData metaData, final Map<String, ShardingSphereDatabaseData> databaseData) {
+        this.databaseData = databaseData;
+        this.metaData = metaData;
+    }
+    
+    @Override
+    public Connection createConnection(final String databaseName, final String schemaName) throws SQLException {
+        Map<String, ShardingSphereTableData> tableDataMap = Optional.ofNullable(databaseData.get(databaseName)).map(database -> database.getSchemaData().get(schemaName))
+                .map(ShardingSphereSchemaData::getTableData).orElseGet(LinkedHashMap::new);
+        ShardingSphereSchema shardingSphereSchema = Optional.ofNullable(metaData.getDatabase(databaseName)).map(database -> database.getSchema(schemaName))
+                .orElseGet(ShardingSphereSchema::new);
+        MemorySchema memorySchema = new MemorySchema(tableDataMap, shardingSphereSchema);
+        Properties info = new Properties();
+        info.setProperty(CalciteConnectionProperty.DEFAULT_NULL_COLLATION.camelName(), NullCollation.LAST.name());
+        info.setProperty(CalciteConnectionProperty.CASE_SENSITIVE.camelName(), "false");
+        Connection result = DriverManager.getConnection("jdbc:calcite:", info);

Review Comment:
   Thank you. Done.



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