Github user arunmahadevan commented on a diff in the pull request:
https://github.com/apache/storm/pull/1635#discussion_r75827034
--- Diff:
external/sql/storm-sql-core/src/jvm/org/apache/storm/sql/compiler/backends/trident/TridentLogicalPlanCompiler.java
---
@@ -0,0 +1,344 @@
+/**
+ * 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
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * 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.storm.sql.compiler.backends.trident;
+
+import com.google.common.base.Joiner;
+import com.google.common.base.Preconditions;
+import com.google.common.primitives.Primitives;
+import org.apache.calcite.adapter.java.JavaTypeFactory;
+import org.apache.calcite.rel.RelNode;
+import org.apache.calcite.rel.core.Aggregate;
+import org.apache.calcite.rel.core.AggregateCall;
+import org.apache.calcite.rel.core.Filter;
+import org.apache.calcite.rel.core.Project;
+import org.apache.calcite.rel.core.TableModify;
+import org.apache.calcite.rel.core.TableScan;
+import org.apache.storm.sql.compiler.ExprCompiler;
+import org.apache.storm.sql.runtime.ISqlTridentDataSource;
+import org.apache.storm.sql.runtime.trident.functions.EvaluationFilter;
+import org.apache.storm.sql.runtime.trident.functions.EvaluationFunction;
+import org.apache.storm.sql.runtime.trident.functions.ForwardFunction;
+import org.apache.storm.sql.runtime.trident.operations.CountBy;
+import org.apache.storm.sql.runtime.trident.operations.DivideForAverage;
+import org.apache.storm.sql.runtime.trident.operations.MaxBy;
+import org.apache.storm.sql.runtime.trident.operations.MinBy;
+import org.apache.storm.sql.runtime.trident.operations.SumBy;
+import org.apache.storm.trident.JoinType;
+import org.apache.storm.trident.Stream;
+import org.apache.storm.trident.TridentTopology;
+import org.apache.storm.trident.fluent.GroupedStream;
+import org.apache.storm.trident.fluent.IAggregatableStream;
+import org.apache.storm.trident.operation.builtin.Count;
+import org.apache.storm.tuple.Fields;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.lang.reflect.Type;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public class TridentLogicalPlanCompiler extends
TridentPostOrderRelNodeVisitor {
+ protected final Map<String, ISqlTridentDataSource> sources;
+ protected final JavaTypeFactory typeFactory;
+
+ public TridentLogicalPlanCompiler(Map<String, ISqlTridentDataSource>
sources, JavaTypeFactory typeFactory, TridentTopology topology) {
+ super(topology);
+ this.sources = sources;
+ this.typeFactory = typeFactory;
+ }
+
+ @Override
+ public IAggregatableStream defaultValue(RelNode n,
List<IAggregatableStream> inputStreams) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public IAggregatableStream visitTableScan(TableScan scan,
List<IAggregatableStream> inputStreams) throws Exception {
+ String sourceName =
Joiner.on('.').join(scan.getTable().getQualifiedName());
+ if (!sources.containsKey(sourceName)) {
+ throw new RuntimeException("Cannot find table " + sourceName);
+ }
+
+ String stageName = getStageName(scan);
+ return topology.newStream(stageName,
sources.get(sourceName).getProducer());
+ }
+
+ @Override
+ public IAggregatableStream visitTableModify(TableModify modify,
List<IAggregatableStream> inputStreams) throws Exception {
+ if (inputStreams.size() > 1) {
+ throw new RuntimeException("TableModify is a SingleRel");
+ }
+
+ Preconditions.checkArgument(modify.isInsert(), "Only INSERT
statement is supported.");
+ RelNode input = modify.getInput();
+ String tableName =
Joiner.on('.').join(modify.getTable().getQualifiedName());
+ Stream inputStream = inputStreams.get(0).toStream();
+ String stageName = getStageName(modify);
+
+ List<String> inputFields = input.getRowType().getFieldNames();
+ List<String> outputFields = modify.getRowType().getFieldNames();
+
+ return inputStream.each(new Fields(inputFields),
sources.get(tableName).getConsumer(), new Fields(outputFields))
+ .name(stageName);
+ }
+
+ @Override
+ public IAggregatableStream visitProject(Project project,
List<IAggregatableStream> inputStreams) throws Exception {
+ if (inputStreams.size() > 1) {
+ throw new RuntimeException("Project is a SingleRel");
+ }
+
+ Stream inputStream = inputStreams.get(0).toStream();
+ Fields inputFields = inputStream.getOutputFields();
+ String stageName = getStageName(project);
+
+ // Trident doesn't allow duplicated field name... need to do the
trick...
+ List<String> outputFieldNames =
project.getRowType().getFieldNames();
+ List<String> temporaryOutputFieldNames = new ArrayList<>();
+ for (String outputFieldName : outputFieldNames) {
+ temporaryOutputFieldNames.add("__" + outputFieldName + "__");
+ }
+
+ try (StringWriter sw = new StringWriter(); PrintWriter pw = new
PrintWriter(sw)) {
+ pw.write("import org.apache.storm.tuple.Values;\n");
+
+ ExprCompiler compiler = new ExprCompiler(pw, typeFactory);
+
+ int size = project.getChildExps().size();
+ String[] res = new String[size];
+ for (int i = 0; i < size; ++i) {
+ res[i] = project.getChildExps().get(i).accept(compiler);
+ }
+
+ pw.write(String.format("\nreturn new Values(%s);",
Joiner.on(',').join(res)));
+ final String expression = sw.toString();
+
+ return inputStream.each(inputFields, new
EvaluationFunction(expression), new Fields(temporaryOutputFieldNames))
+ .project(new Fields(temporaryOutputFieldNames))
+ .each(new Fields(temporaryOutputFieldNames), new
ForwardFunction(), new Fields(outputFieldNames))
+ .project(new Fields(outputFieldNames))
+ .name(stageName);
+ }
+ }
+
+ @Override
+ public IAggregatableStream visitFilter(Filter filter,
List<IAggregatableStream> inputStreams) throws Exception {
+ if (inputStreams.size() > 1) {
+ throw new RuntimeException("Filter is a SingleRel");
+ }
+
+ Stream inputStream = inputStreams.get(0).toStream();
+ String stageName = getStageName(filter);
+
+ try (StringWriter sw = new StringWriter(); PrintWriter pw = new
PrintWriter(sw)) {
+ pw.write("import org.apache.storm.tuple.Values;\n");
+
+ ExprCompiler compiler = new ExprCompiler(pw, typeFactory);
+ String ret = filter.getCondition().accept(compiler);
+ pw.write(String.format("\nreturn %s;", ret));
+ final String expression = sw.toString();
+
+ return inputStream.filter(new
EvaluationFilter(expression)).name(stageName);
+ }
+ }
+
+ @Override
+ public IAggregatableStream visitAggregate(Aggregate aggregate,
List<IAggregatableStream> inputStreams) throws Exception {
+ if (inputStreams.size() > 1) {
+ throw new RuntimeException("Aggregate is a SingleRel");
+ }
+
+ Stream inputStream = inputStreams.get(0).toStream();
+ String stageName = getStageName(aggregate);
+
+ List<String> groupByFieldNames = new ArrayList<>();
+ for (Integer idx : aggregate.getGroupSet()) {
+ String fieldName = inputStream.getOutputFields().get(idx);
+ groupByFieldNames.add(fieldName);
+ }
+
+ Fields groupByFields = new Fields(groupByFieldNames);
+ GroupedStream groupedStream = inputStream.groupBy(groupByFields);
+
+ List<Stream> joiningStreams = new ArrayList<>();
+ List<Fields> joiningFields = new ArrayList<>();
+ List<String> newOutputFields = new ArrayList<>();
+ newOutputFields.addAll(groupByFieldNames);
+
+ for (AggregateCall call : aggregate.getAggCallList()) {
+ Stream aggregateStream = handleAggregateCall(groupedStream,
groupByFieldNames, inputStream, call);
+
+ Fields outputFields = aggregateStream.getOutputFields();
+ // assuming handleAggregateCall does project so that new
output field is always placed to end of fields
+ String newFieldName = outputFields.get(outputFields.size() -
1);
+
+ joiningStreams.add(aggregateStream);
+ joiningFields.add(groupByFields);
+ newOutputFields.add(newFieldName);
+ }
+
+ return topology.join(joiningStreams, joiningFields, new
Fields(newOutputFields), JoinType.INNER).name(stageName);
--- End diff --
here we create a separate stream per aggregate function and thats why the
join here ? May be we can just execute the different aggregate functions in a
single Function and emit the results to avoid the separate streams and join. It
may produce optimized topology, but I am not sure.
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