org.apache.hadoop.hive.ql.plan.ExprNodeColumnDesc.java Source code

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Here is the source code for org.apache.hadoop.hive.ql.plan.ExprNodeColumnDesc.java

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/**
 * 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
 * limitations under the License.
 */

package org.apache.hadoop.hive.ql.plan;

import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.hadoop.hive.ql.exec.ColumnInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

/**
 * ExprNodeColumnDesc.
 *
 */
public class ExprNodeColumnDesc extends ExprNodeDesc implements Serializable {
    private static final long serialVersionUID = 1L;

    /**
     * The column name.
     */
    private String column;

    /**
     * The alias of the table.
     */
    private String tabAlias;

    /**
     * Is the column a partitioned column.
     */
    private boolean isPartitionColOrVirtualCol;

    /**
     * Is the column a skewed column
     */
    private boolean isSkewedCol;

    /**
     * Is this column a generated column, i.e., a column
     * that is generated from table schema when Hive inserting SEL op for column pruning.
     * This column has no relation with the input query.
     *
     * This is used for nested column pruning where we could have the following scenario:
     *   ...
     *    |
     *   SEL (use a)
     *    |
     *   OP (use a.f)
     *    |
     *   ...
     * Without this field we do not know whether the column 'a' is actually specified in
     * the input query or an inserted op by Hive. For the former case, the pruning needs
     * to produce 'a', while for the latter case, it should produce 'a.f'.
     */
    private transient boolean isGenerated;

    public ExprNodeColumnDesc() {
    }

    public ExprNodeColumnDesc(ColumnInfo ci) {
        this(ci, false);
    }

    public ExprNodeColumnDesc(ColumnInfo ci, boolean isGenerated) {
        this(ci.getType(), ci.getInternalName(), ci.getTabAlias(), ci.getIsVirtualCol(), false, isGenerated);
    }

    public ExprNodeColumnDesc(TypeInfo typeInfo, String column, String tabAlias,
            boolean isPartitionColOrVirtualCol) {
        this(typeInfo, column, tabAlias, isPartitionColOrVirtualCol, false, false);
    }

    public ExprNodeColumnDesc(Class<?> c, String column, String tabAlias, boolean isPartitionColOrVirtualCol) {
        this(TypeInfoFactory.getPrimitiveTypeInfoFromJavaPrimitive(c), column, tabAlias, isPartitionColOrVirtualCol,
                false, false);
    }

    public ExprNodeColumnDesc(TypeInfo typeInfo, String column, String tabAlias, boolean isPartitionColOrVirtualCol,
            boolean isSkewedCol) {
        this(typeInfo, column, tabAlias, isPartitionColOrVirtualCol, isSkewedCol, false);
    }

    public ExprNodeColumnDesc(TypeInfo typeInfo, String column, String tabAlias, boolean isPartitionColOrVirtualCol,
            boolean isSkewedCol, boolean isGenerated) {
        super(typeInfo);
        this.column = column;
        this.tabAlias = tabAlias;
        this.isPartitionColOrVirtualCol = isPartitionColOrVirtualCol;
        this.isSkewedCol = isSkewedCol;
        this.isGenerated = isGenerated;
    }

    public String getColumn() {
        return column;
    }

    public void setColumn(String column) {
        this.column = column;
    }

    public String getTabAlias() {
        return tabAlias;
    }

    public void setTabAlias(String tabAlias) {
        this.tabAlias = tabAlias;
    }

    public boolean getIsPartitionColOrVirtualCol() {
        return isPartitionColOrVirtualCol;
    }

    public void setIsPartitionColOrVirtualCol(boolean isPartitionCol) {
        this.isPartitionColOrVirtualCol = isPartitionCol;
    }

    public boolean getIsGenerated() {
        return this.isGenerated;
    }

    public void setIsGenerated(boolean isGenerated) {
        this.isGenerated = isGenerated;
    }

    @Override
    public String toString() {
        return "Column[" + column + "]";
    }

    @Override
    public String getExprString() {
        return getColumn();
    }

    @Override
    public List<String> getCols() {
        List<String> lst = new ArrayList<String>();
        lst.add(column);
        return lst;
    }

    @Override
    public ExprNodeDesc clone() {
        return new ExprNodeColumnDesc(typeInfo, column, tabAlias, isPartitionColOrVirtualCol, isSkewedCol);
    }

    @Override
    public boolean isSame(Object o) {
        if (!(o instanceof ExprNodeColumnDesc)) {
            return false;
        }
        ExprNodeColumnDesc dest = (ExprNodeColumnDesc) o;
        if (!column.equals(dest.getColumn())) {
            return false;
        }
        if (!typeInfo.equals(dest.getTypeInfo())) {
            return false;
        }
        if (tabAlias != null && dest.tabAlias != null) {
            if (!tabAlias.equals(dest.tabAlias)) {
                return false;
            }
        }
        return true;
    }

    /**
     * @return the isSkewedCol
     */
    public boolean isSkewedCol() {
        return isSkewedCol;
    }

    /**
     * @param isSkewedCol the isSkewedCol to set
     */
    public void setSkewedCol(boolean isSkewedCol) {
        this.isSkewedCol = isSkewedCol;
    }

    @Override
    public int hashCode() {
        int superHashCode = super.hashCode();
        HashCodeBuilder builder = new HashCodeBuilder();
        builder.appendSuper(superHashCode);
        builder.append(column);
        builder.append(tabAlias);
        return builder.toHashCode();
    }
}