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From gparai <...@git.apache.org>
Subject [GitHub] drill pull request #729: Drill 1328: Support table statistics for Parquet
Date Sun, 12 Feb 2017 22:34:04 GMT
Github user gparai commented on a diff in the pull request:

    --- 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
    + * 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
    --- End diff --
    The maps except the `column name` map, would contain the specific stats (e.g. rowcount)
as the value. The `column name` map contains redundant information. As of 1.10, we would not
support nested data types e.g. maps.

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