jp.co.yahoo.yosegi.hive.pushdown.RegexpHiveExpr Maven / Gradle / Ivy
/**
* 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.column.filter.IFilter;
import jp.co.yahoo.yosegi.spread.column.filter.RegexpMatchStringFilter;
import jp.co.yahoo.yosegi.spread.expression.ExecuterNode;
import jp.co.yahoo.yosegi.spread.expression.IExpressionNode;
import jp.co.yahoo.yosegi.spread.expression.IExtractNode;
import org.apache.hadoop.hive.ql.plan.ExprNodeConstantDesc;
import org.apache.hadoop.hive.ql.plan.ExprNodeDesc;
import org.apache.hadoop.hive.ql.plan.ExprNodeGenericFuncDesc;
import org.apache.hadoop.hive.ql.udf.UDFLike;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.WritableConstantStringObjectInspector;
import java.util.List;
public class RegexpHiveExpr implements IHiveExprNode {
private final List nodeDescList;
public RegexpHiveExpr( final List nodeDescList ) {
this.nodeDescList = nodeDescList;
}
/**
* Create filter condition.
*/
public static IExpressionNode getRegexpExecuter(
final ExprNodeConstantDesc constDesc , final IExtractNode targetColumn ) {
ObjectInspector objectInspector = constDesc.getWritableObjectInspector();
if ( objectInspector.getCategory() != ObjectInspector.Category.PRIMITIVE ) {
return null;
}
PrimitiveObjectInspector primitiveObjectInspector = (PrimitiveObjectInspector)objectInspector;
IFilter filter = null;
switch ( primitiveObjectInspector.getPrimitiveCategory() ) {
case STRING:
String regexp = UDFLike.likePatternToRegExp(
( (WritableConstantStringObjectInspector)primitiveObjectInspector )
.getWritableConstantValue().toString() );
filter = new RegexpMatchStringFilter( "^" + regexp + "$" );
break;
case BINARY:
case BOOLEAN:
case BYTE:
case DOUBLE:
case FLOAT:
case INT:
case LONG:
case SHORT:
case DATE:
case DECIMAL:
case TIMESTAMP:
case VOID:
default:
filter = null;
break;
}
if ( filter == null ) {
return null;
}
return new ExecuterNode( targetColumn , filter );
}
@Override
public void addChildNode( final ExprNodeGenericFuncDesc exprNodeDesc ) {
throw new UnsupportedOperationException( "IHiveExprNode node can not have child node." );
}
@Override
public IExpressionNode getPushDownFilterNode() {
if ( nodeDescList.size() != 2 ) {
return null;
}
ExprNodeDesc exprNode1 = nodeDescList.get( 0 );
ExprNodeDesc exprNode2 = nodeDescList.get( 1 );
ExprNodeDesc columnDesc;
ExprNodeConstantDesc constantDesc;
if ( exprNode1 instanceof ExprNodeConstantDesc ) {
columnDesc = exprNode2;
constantDesc = (ExprNodeConstantDesc)exprNode1;
} else if ( exprNode2 instanceof ExprNodeConstantDesc ) {
columnDesc = exprNode1;
constantDesc = (ExprNodeConstantDesc)exprNode2;
} else {
return null;
}
IExtractNode extractNode = CreateExtractNodeUtil.getExtractNode( columnDesc );
if ( extractNode == null ) {
return null;
}
return getRegexpExecuter( constantDesc , extractNode );
}
}