jp.co.yahoo.yosegi.hive.pushdown.HiveExprOrNode Maven / Gradle / Ivy

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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 jp.co.yahoo.yosegi.hive.pushdown;

import jp.co.yahoo.yosegi.spread.expression.IExpressionNode;
import jp.co.yahoo.yosegi.spread.expression.OrExpressionNode;
import org.apache.hadoop.hive.ql.plan.ExprNodeColumnDesc;
import org.apache.hadoop.hive.ql.plan.ExprNodeDesc;
import org.apache.hadoop.hive.ql.plan.ExprNodeFieldDesc;
import org.apache.hadoop.hive.ql.plan.ExprNodeGenericFuncDesc;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDF;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDFOPAnd;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDFOPNot;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDFOPOr;

import java.util.ArrayList;
import java.util.List;

public class HiveExprOrNode implements IHiveExprNode {

  private final List childNodeList = new ArrayList();

  public HiveExprOrNode() {}

  /**
   * Create Not condition and child filter condition.
   */
  public HiveExprOrNode( final List childExprNodeDesc ) {
    for ( ExprNodeDesc nodeChild : childExprNodeDesc  ) {
      if ( nodeChild instanceof ExprNodeGenericFuncDesc ) {
        addChildNode( (ExprNodeGenericFuncDesc)nodeChild );
      } else if ( ( nodeChild instanceof ExprNodeColumnDesc )
          || ( nodeChild instanceof ExprNodeFieldDesc ) ) {
        childNodeList.add( new BooleanHiveExpr( nodeChild ) );
      } else {
        childNodeList.add( new UnsupportHiveExpr() );
      }
    }
  }

  @Override
  public void addChildNode( final ExprNodeGenericFuncDesc exprNodeDesc ) {
    GenericUDF udf = exprNodeDesc.getGenericUDF();
    if ( udf instanceof GenericUDFOPAnd ) {
      childNodeList.add( new HiveExprAndNode( exprNodeDesc.getChildren() ) );
    } else if ( udf instanceof GenericUDFOPOr ) {
      childNodeList.add( new HiveExprOrNode( exprNodeDesc.getChildren() ) );
    } else if ( udf instanceof GenericUDFOPNot ) {
      childNodeList.add( new HiveExprNotNode( exprNodeDesc.getChildren() ) );
    } else {
      childNodeList.add( HiveExprFactory.get( exprNodeDesc , udf , exprNodeDesc.getChildren() ) );
    }
  }

  @Override
  public IExpressionNode getPushDownFilterNode() {
    IExpressionNode result = new OrExpressionNode();
    for ( IHiveExprNode childHiveExprNode : childNodeList ) {
      IExpressionNode childNode = childHiveExprNode.getPushDownFilterNode();
      if ( childNode == null ) {
        return new OrExpressionNode();
      }
      result.addChildNode( childNode );
    }

    return result;
  }

}