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From gparai <...@git.apache.org>
Subject [GitHub] drill pull request #729: Drill 1328: Support table statistics for Parquet
Date Tue, 21 Feb 2017 19:11:32 GMT
Github user gparai commented on a diff in the pull request:

    https://github.com/apache/drill/pull/729#discussion_r102291099
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/unpivot/UnpivotMapsRecordBatch.java
---
    @@ -0,0 +1,276 @@
    +/**
    + * 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.unpivot;
    +
    +import java.util.List;
    +import java.util.Map;
    +
    +import org.apache.drill.common.types.TypeProtos.MajorType;
    +import org.apache.drill.common.types.TypeProtos.MinorType;
    +import org.apache.drill.exec.exception.OutOfMemoryException;
    +import org.apache.drill.exec.exception.SchemaChangeException;
    +import org.apache.drill.exec.expr.TypeHelper;
    +import org.apache.drill.exec.ops.FragmentContext;
    +import org.apache.drill.exec.physical.config.UnpivotMaps;
    +import org.apache.drill.exec.record.AbstractSingleRecordBatch;
    +import org.apache.drill.exec.record.MaterializedField;
    +import org.apache.drill.exec.record.RecordBatch;
    +import org.apache.drill.exec.record.TransferPair;
    +import org.apache.drill.exec.record.VectorContainer;
    +import org.apache.drill.exec.record.VectorWrapper;
    +import org.apache.drill.exec.vector.ValueVector;
    +import org.apache.drill.exec.vector.complex.MapVector;
    +
    +import com.google.common.collect.Lists;
    +import com.google.common.collect.Maps;
    +
    +/**
    + * Unpivot maps. Assumptions are:
    + *  1) all child vectors in a map are of same type.
    + *  2) Each map contains the same number of fields and field names are also same (types
could be different).
    + *
    + * Example input and output:
    + * Schema of input:
    + *    "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 ....
    + *
    + * Schema of output:
    --- End diff --
    
    For now, we stick to the original reviewed design. We can revisit the design later, if
required. 


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