Github user gparai commented on a diff in the pull request:
https://github.com/apache/drill/pull/729#discussion_r100708170
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/statistics/StatisticsAggBatch.java
---
@@ -0,0 +1,256 @@
+/**
+ * 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.drill.exec.physical.impl.statistics;
+
+import com.google.common.collect.Lists;
+import com.sun.codemodel.JExpr;
+import org.apache.drill.common.expression.ErrorCollector;
+import org.apache.drill.common.expression.ErrorCollectorImpl;
+import org.apache.drill.common.expression.FunctionCallFactory;
+import org.apache.drill.common.expression.LogicalExpression;
+import org.apache.drill.common.expression.SchemaPath;
+import org.apache.drill.common.expression.ValueExpressions;
+import org.apache.drill.exec.exception.ClassTransformationException;
+import org.apache.drill.exec.exception.OutOfMemoryException;
+import org.apache.drill.exec.exception.SchemaChangeException;
+import org.apache.drill.exec.expr.ClassGenerator;
+import org.apache.drill.exec.expr.CodeGenerator;
+import org.apache.drill.exec.expr.ExpressionTreeMaterializer;
+import org.apache.drill.exec.expr.TypeHelper;
+import org.apache.drill.exec.expr.ValueVectorWriteExpression;
+import org.apache.drill.exec.ops.FragmentContext;
+import org.apache.drill.exec.physical.config.StatisticsAggregate;
+import org.apache.drill.exec.physical.impl.aggregate.StreamingAggBatch;
+import org.apache.drill.exec.physical.impl.aggregate.StreamingAggTemplate;
+import org.apache.drill.exec.physical.impl.aggregate.StreamingAggregator;
+import org.apache.drill.exec.planner.physical.StatsAggPrel.OperatorPhase;
+import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
+import org.apache.drill.exec.record.MaterializedField;
+import org.apache.drill.exec.record.RecordBatch;
+import org.apache.drill.exec.record.TypedFieldId;
+import org.apache.drill.exec.store.ImplicitColumnExplorer;
+import org.apache.drill.exec.vector.ValueVector;
+import org.apache.drill.exec.vector.complex.FieldIdUtil;
+import org.apache.drill.exec.vector.complex.MapVector;
+
+import java.io.IOException;
+import java.util.GregorianCalendar;
+import java.util.List;
+import java.util.TimeZone;
+
+/**
+ * TODO: This needs cleanup. Currently the key values are constants and we
compare the constants
+ * for every record. Seems unnecessary.
+ *
+ * Example input and output:
+ * Schema of incoming batch: region_id (VARCHAR), sales_city (VARCHAR),
cnt (BIGINT)
+ * Schema of output:
+ * "schema" : BIGINT - Schema number. For each schema change this
number is incremented.
+ * "computed" : BIGINT - What time is it computed?
+ * "columns" : MAP - Column names
+ * "region_id" : VARCHAR
+ * "sales_city" : VARCHAR
+ * "cnt" : VARCHAR
+ * "statscount" : MAP
+ * "region_id" : BIGINT - statscount(region_id) - aggregation over
all values of region_id
+ * in incoming batch
+ * "sales_city" : BIGINT - statscount(sales_city)
+ * "cnt" : BIGINT - statscount(cnt)
+ * "nonnullstatcount" : MAP
+ * "region_id" : BIGINT - nonnullstatcount(region_id)
+ * "sales_city" : BIGINT - nonnullstatcount(sales_city)
+ * "cnt" : BIGINT - nonnullstatcount(cnt)
+ * .... another map for next stats function ....
+ */
+public class StatisticsAggBatch extends StreamingAggBatch {
+ private List<String> functions;
+ private int schema = 0;
+
+ public StatisticsAggBatch(StatisticsAggregate popConfig, RecordBatch
incoming,
+ FragmentContext context) throws OutOfMemoryException {
+ super(popConfig, incoming, context);
+ this.functions = popConfig.getFunctions();
+ }
+
+ private void createKeyColumn(String name, LogicalExpression expr,
List<LogicalExpression> keyExprs,
+ List<TypedFieldId> keyOutputIds) throws SchemaChangeException {
+ ErrorCollector collector = new ErrorCollectorImpl();
+
+ LogicalExpression mle = ExpressionTreeMaterializer.materialize(expr,
incoming, collector,
+ context.getFunctionRegistry());
+
+ MaterializedField outputField = MaterializedField.create(name,
mle.getMajorType());
+ ValueVector vector = TypeHelper.getNewVector(outputField,
oContext.getAllocator());
+
+ keyExprs.add(mle);
+ keyOutputIds.add(container.add(vector));
+
+ if (collector.hasErrors()) {
--- End diff --
Moved it earlier as suggested. However, the ErrorCollector collects
ExpressionValidationError which is not subclassed from error or exception
classes. We would need to subclass it and generate the equivalent
error/exception in order to re-throw it.
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