[GitHub] [shardingsphere] zhujunxxxxx commented on a change in pull request #9934: Query optimization for federated SQL query

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

zhujunxxxxx commented on a change in pull request #9934:
URL: https://github.com/apache/shardingsphere/pull/9934#discussion_r606892495



##########
File path: shardingsphere-infra/shardingsphere-infra-optimizer/src/main/java/org/apache/shardingsphere/infra/optimizer/converter/RelNodeConverter.java
##########
@@ -0,0 +1,118 @@
+/*
+ * 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.infra.optimizer.converter;
+
+import org.apache.calcite.config.CalciteConnectionConfigImpl;
+import org.apache.calcite.jdbc.CalciteSchema;
+import org.apache.calcite.jdbc.JavaTypeFactoryImpl;
+import org.apache.calcite.plan.Contexts;
+import org.apache.calcite.plan.ConventionTraitDef;
+import org.apache.calcite.plan.RelOptCluster;
+import org.apache.calcite.plan.RelOptCostFactory;
+import org.apache.calcite.plan.RelOptCostImpl;
+import org.apache.calcite.plan.volcano.VolcanoPlanner;
+import org.apache.calcite.prepare.CalciteCatalogReader;
+import org.apache.calcite.rel.RelCollationTraitDef;
+import org.apache.calcite.rel.RelNode;
+import org.apache.calcite.rel.RelRoot;
+import org.apache.calcite.rel.type.RelDataTypeFactory;
+import org.apache.calcite.rel.type.RelDataTypeSystem;
+import org.apache.calcite.rex.RexBuilder;
+import org.apache.calcite.schema.SchemaPlus;
+import org.apache.calcite.sql.SqlNode;
+import org.apache.calcite.sql.fun.SqlStdOperatorTable;
+import org.apache.calcite.sql.type.SqlTypeFactoryImpl;
+import org.apache.calcite.sql.validate.SqlConformanceEnum;
+import org.apache.calcite.sql.validate.SqlValidator;
+import org.apache.calcite.sql.validate.SqlValidatorUtil;
+import org.apache.calcite.sql.validate.SqlValidatorWithHints;
+import org.apache.calcite.sql2rel.SqlToRelConverter;
+import org.apache.calcite.sql2rel.StandardConvertletTable;
+import org.apache.calcite.tools.Frameworks;
+import org.apache.shardingsphere.infra.metadata.schema.ShardingSphereSchema;
+import org.apache.shardingsphere.infra.optimizer.schema.ShardingSphereCalciteSchema;
+
+import java.util.Properties;
+
+/**
+ * convert calcite SqlNode to calcite RelNode.
+ */
+public class RelNodeConverter {
+
+    private static boolean topDownOpt = Boolean.parseBoolean(System.getProperty("calcite.planner.topdown.opt", "true"));
+    
+    private static final RelDataTypeFactory TYPE_FACTORY = new SqlTypeFactoryImpl(RelDataTypeSystem.DEFAULT);
+    
+    private final RelOptCostFactory costFactory = RelOptCostImpl.FACTORY;
+
+    private final SqlToRelConverter.Config converterConfig;
+
+    private final SqlValidatorWithHints validator;
+    
+    private final CalciteCatalogReader catalog;
+    
+    private final ShardingSphereSchema shardingSphereSchema;
+
+    public RelNodeConverter(final String schemaName, final ShardingSphereSchema shardingSphereSchema) {
+        this.shardingSphereSchema = shardingSphereSchema;
+        this.converterConfig = SqlToRelConverter.config()
+                .withInSubQueryThreshold(Integer.MAX_VALUE)
+                .withExpand(false);
+        CalciteSchema rootSchema = createRootSchema(schemaName);
+        this.catalog = new CalciteCatalogReader(rootSchema,
+                rootSchema.path(schemaName),
+                new JavaTypeFactoryImpl(),
+                new CalciteConnectionConfigImpl(new Properties()));
+
+        validator = SqlValidatorUtil.newValidator(SqlStdOperatorTable.instance(), catalog, TYPE_FACTORY, SqlValidator.Config.DEFAULT
+                .withLenientOperatorLookup(false)
+                .withSqlConformance(SqlConformanceEnum.DEFAULT)
+                .withIdentifierExpansion(true));
+    }
+
+    /**
+     * validate calcite SqlNode and convert SqlNode to RelNode.
+     * @param sqlNode SqlNode to be validated and converted
+     * @return relational algebra of sql
+     */
+    public RelNode validateAndConvert(final SqlNode sqlNode) {
+        final RelOptCluster cluster = createRelOptCluster();
+        final SqlToRelConverter sqlToRelConverter = new SqlToRelConverter(null, validator, catalog, cluster,
+                StandardConvertletTable.INSTANCE, converterConfig);
+

Review comment:
       remove this empty line please.




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