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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.drill.exec.expr;
import org.apache.drill.shaded.guava.com.google.common.collect.ImmutableSet;
import org.apache.drill.common.expression.ExpressionPosition;
import org.apache.drill.common.expression.LogicalExpression;
import org.apache.drill.common.expression.PathSegment;
import org.apache.drill.common.expression.visitors.ExprVisitor;
import org.apache.drill.common.types.TypeProtos.MajorType;
import org.apache.drill.exec.record.TypedFieldId;
import java.util.Iterator;
/**
* Wraps a value vector field to be read, providing metadata about the field.
* Also may contain batch naming information to which this field belongs.
* If such information is absent default namings will be used from mapping set during materialization.
*/
public class ValueVectorReadExpression implements LogicalExpression {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(ValueVectorReadExpression.class);
private final TypedFieldId fieldId;
private final BatchReference batchRef;
public ValueVectorReadExpression(TypedFieldId tfId){
this(tfId, null);
}
public ValueVectorReadExpression(TypedFieldId tfId, BatchReference batchRef){
this.fieldId = tfId;
this.batchRef = batchRef;
}
public BatchReference getBatchRef() {
return batchRef;
}
public boolean hasReadPath(){
return fieldId.hasRemainder();
}
public PathSegment getReadPath(){
return fieldId.getRemainder();
}
public TypedFieldId getTypedFieldId(){
return fieldId;
}
public boolean isSuperReader(){
return fieldId.isHyperReader();
}
@Override
public MajorType getMajorType() {
return fieldId.getFinalType();
}
@Override
public <T, V, E extends Exception> T accept(ExprVisitor<T, V, E> visitor, V value) throws E {
if (visitor instanceof AbstractExecExprVisitor) {
AbstractExecExprVisitor<T, V, E> abstractExecExprVisitor = (AbstractExecExprVisitor<T, V, E>) visitor;
return abstractExecExprVisitor.visitValueVectorReadExpression(this, value);
}
return visitor.visitUnknown(this, value);
}
public TypedFieldId getFieldId() {
return fieldId;
}
@Override
public ExpressionPosition getPosition() {
return ExpressionPosition.UNKNOWN;
}
@Override
public Iterator<LogicalExpression> iterator() {
return ImmutableSet.<LogicalExpression>of().iterator();
}
@Override
public int getSelfCost() {
return 0; // TODO
}
@Override
public int getCumulativeCost() {
return 0; // TODO
}
@Override
public String toString() {
return "ValueVectorReadExpression [fieldId=" + fieldId + "]";
}
}
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