ygerzhedovich commented on a change in pull request #9476:
URL: https://github.com/apache/ignite/pull/9476#discussion_r724218538



##########
File path: 
modules/calcite/src/main/java/org/apache/ignite/internal/processors/query/calcite/RootQuery.java
##########
@@ -0,0 +1,316 @@
+/*
+ * 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.ignite.internal.processors.query.calcite;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+import java.util.UUID;
+import java.util.function.Consumer;
+import org.apache.calcite.plan.Context;
+import org.apache.calcite.schema.SchemaPlus;
+import org.apache.calcite.tools.Frameworks;
+import org.apache.calcite.util.CancelFlag;
+import org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.IgniteException;
+import org.apache.ignite.IgniteLogger;
+import org.apache.ignite.cache.query.QueryCancelledException;
+import org.apache.ignite.internal.cluster.ClusterTopologyCheckedException;
+import org.apache.ignite.internal.processors.cache.query.IgniteQueryErrorCode;
+import org.apache.ignite.internal.processors.query.GridQueryCancel;
+import org.apache.ignite.internal.processors.query.IgniteSQLException;
+import org.apache.ignite.internal.processors.query.QueryContext;
+import org.apache.ignite.internal.processors.query.QueryState;
+import 
org.apache.ignite.internal.processors.query.calcite.exec.ExchangeService;
+import 
org.apache.ignite.internal.processors.query.calcite.exec.ExecutionContext;
+import org.apache.ignite.internal.processors.query.calcite.exec.rel.Node;
+import org.apache.ignite.internal.processors.query.calcite.exec.rel.RootNode;
+import 
org.apache.ignite.internal.processors.query.calcite.prepare.BaseQueryContext;
+import org.apache.ignite.internal.processors.query.calcite.prepare.Fragment;
+import 
org.apache.ignite.internal.processors.query.calcite.prepare.MultiStepPlan;
+import 
org.apache.ignite.internal.processors.query.calcite.prepare.PlanningContext;
+import org.apache.ignite.internal.processors.query.calcite.util.Commons;
+import org.apache.ignite.internal.util.typedef.F;
+import org.apache.ignite.internal.util.typedef.internal.S;
+
+import static 
org.apache.ignite.internal.processors.query.calcite.CalciteQueryProcessor.FRAMEWORK_CONFIG;
+
+/** */
+public class RootQuery<Row> extends Query<Row> {
+    /** SQL query. */
+    private final String sql;
+
+    /** Parameters. */
+    private final Object[] params;
+
+    /** Logger. */
+    private final IgniteLogger log;
+
+    /** remote nodes */
+    private final Set<UUID> remotes;
+
+    /** node to fragment */
+    private final Set<RemoteFragmentKey> waiting;
+
+    /** */
+    private volatile RootNode<Row> root;
+
+    /** */
+    private volatile PlanningContext pctx;
+
+    /** */
+    private final BaseQueryContext ctx;
+
+    /** */
+    private final ExchangeService exch;
+
+    /** */
+    public RootQuery(

Review comment:
       Let's write good javadoc for whole class




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