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From anubhav100 <...@git.apache.org>
Subject [GitHub] carbondata pull request #1218: [CARBONDATA-1347] Implemented Columnar Readin...
Date Tue, 01 Aug 2017 13:21:10 GMT
Github user anubhav100 commented on a diff in the pull request:

    https://github.com/apache/carbondata/pull/1218#discussion_r130604641
  
    --- Diff: integration/presto/src/main/java/org/apache/carbondata/presto/CarbondataFilterUtil.java
---
    @@ -0,0 +1,223 @@
    +/*
    + * 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
    + */
    +
    +package org.apache.carbondata.presto;
    +
    +import java.util.ArrayList;
    +import java.util.HashMap;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.stream.Collectors;
    +
    +import org.apache.carbondata.core.metadata.datatype.DataType;
    +import org.apache.carbondata.core.metadata.schema.table.CarbonTable;
    +import org.apache.carbondata.core.scan.expression.ColumnExpression;
    +import org.apache.carbondata.core.scan.expression.Expression;
    +import org.apache.carbondata.core.scan.expression.LiteralExpression;
    +import org.apache.carbondata.core.scan.expression.conditional.EqualToExpression;
    +import org.apache.carbondata.core.scan.expression.conditional.GreaterThanEqualToExpression;
    +import org.apache.carbondata.core.scan.expression.conditional.GreaterThanExpression;
    +import org.apache.carbondata.core.scan.expression.conditional.InExpression;
    +import org.apache.carbondata.core.scan.expression.conditional.LessThanEqualToExpression;
    +import org.apache.carbondata.core.scan.expression.conditional.LessThanExpression;
    +import org.apache.carbondata.core.scan.expression.conditional.ListExpression;
    +import org.apache.carbondata.core.scan.expression.logical.AndExpression;
    +import org.apache.carbondata.core.scan.expression.logical.OrExpression;
    +
    +import com.facebook.presto.spi.ColumnHandle;
    +import com.facebook.presto.spi.predicate.Domain;
    +import com.facebook.presto.spi.predicate.Range;
    +import com.facebook.presto.spi.predicate.TupleDomain;
    +import com.facebook.presto.spi.type.BigintType;
    +import com.facebook.presto.spi.type.BooleanType;
    +import com.facebook.presto.spi.type.DateType;
    +import com.facebook.presto.spi.type.DecimalType;
    +import com.facebook.presto.spi.type.DoubleType;
    +import com.facebook.presto.spi.type.IntegerType;
    +import com.facebook.presto.spi.type.SmallintType;
    +import com.facebook.presto.spi.type.TimestampType;
    +import com.facebook.presto.spi.type.Type;
    +import com.facebook.presto.spi.type.VarcharType;
    +import com.google.common.collect.ImmutableList;
    +import io.airlift.slice.Slice;
    +
    +import static com.google.common.base.Preconditions.checkArgument;
    +
    +public class CarbondataFilterUtil {
    +
    +  private static Map<Integer, Expression> filterMap = new HashMap<>();
    +
    +  private static DataType Spi2CarbondataTypeMapper(CarbondataColumnHandle carbondataColumnHandle)
{
    +    Type colType = carbondataColumnHandle.getColumnType();
    +    if (colType == BooleanType.BOOLEAN) return DataType.BOOLEAN;
    +    else if (colType == SmallintType.SMALLINT) return DataType.SHORT;
    +    else if (colType == IntegerType.INTEGER) return DataType.INT;
    +    else if (colType == BigintType.BIGINT) return DataType.LONG;
    +    else if (colType == DoubleType.DOUBLE) return DataType.DOUBLE;
    +    else if (colType == VarcharType.VARCHAR) return DataType.STRING;
    +    else if (colType == DateType.DATE) return DataType.DATE;
    +    else if (colType == TimestampType.TIMESTAMP) return DataType.TIMESTAMP;
    +    else if (colType == DecimalType.createDecimalType(carbondataColumnHandle.getPrecision(),
    +        carbondataColumnHandle.getScale())) return DataType.DECIMAL;
    +    else return DataType.STRING;
    +  }
    +
    +  /**
    +   * Convert presto-TupleDomain predication into Carbon scan express condition
    +   *
    +   * @param originalConstraint presto-TupleDomain
    +   * @param carbonTable
    +   * @return
    +   */
    +  public static Expression parseFilterExpression(TupleDomain<ColumnHandle> originalConstraint,
    +      CarbonTable carbonTable) {
    +    ImmutableList.Builder<Expression> filters = ImmutableList.builder();
    +
    +    Domain domain = null;
    +
    +    for (ColumnHandle c : originalConstraint.getDomains().get().keySet()) {
    +
    +      // Build ColumnExpresstion for Expresstion(Carbondata)
    +      CarbondataColumnHandle cdch = (CarbondataColumnHandle) c;
    +      Type type = cdch.getColumnType();
    +
    +      DataType coltype = Spi2CarbondataTypeMapper(cdch);
    +      Expression colExpression = new ColumnExpression(cdch.getColumnName(), coltype);
    +
    +      domain = originalConstraint.getDomains().get().get(c);
    +      checkArgument(domain.getType().isOrderable(), "Domain type must be orderable");
    +
    +      if (domain.getValues().isNone()) {
    --- End diff --
    
    @chenliang613 yup removed


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