/**
* 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.tajo.engine.planner.logical;
import com.google.common.base.Objects;
import com.google.gson.annotations.Expose;
import org.apache.tajo.catalog.Schema;
import org.apache.tajo.catalog.TableDesc;
import org.apache.tajo.engine.eval.EvalNode;
import org.apache.tajo.engine.planner.PlanString;
import org.apache.tajo.engine.planner.PlannerUtil;
import org.apache.tajo.engine.planner.Target;
import org.apache.tajo.util.TUtil;
public class ScanNode extends RelationNode implements Projectable {
@Expose private TableDesc tableDesc;
@Expose private String alias;
@Expose private Schema renamedSchema;
@Expose private EvalNode qual;
@Expose private Target[] targets;
public ScanNode(int pid, TableDesc desc) {
super(pid, NodeType.SCAN);
this.tableDesc = desc;
this.setInSchema(tableDesc.getSchema());
this.setOutSchema(tableDesc.getSchema());
}
public ScanNode(int pid, TableDesc desc, String alias) {
this(pid, desc);
this.alias = PlannerUtil.normalizeTableName(alias);
renamedSchema = getOutSchema();
renamedSchema.setQualifier(this.alias, true);
}
public String getTableName() {
return tableDesc.getName();
}
public boolean hasAlias() {
return alias != null;
}
public String getCanonicalName() {
return hasAlias() ? alias : tableDesc.getName();
}
public Schema getTableSchema() {
return hasAlias() ? renamedSchema : tableDesc.getSchema();
}
public boolean hasQual() {
return qual != null;
}
public EvalNode getQual() {
return this.qual;
}
public void setQual(EvalNode evalTree) {
this.qual = evalTree;
}
@Override
public boolean hasTargets() {
return this.targets != null;
}
@Override
public void setTargets(Target [] targets) {
this.targets = targets;
}
@Override
public Target [] getTargets() {
return this.targets;
}
public TableDesc getTableDesc() {
return tableDesc;
}
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("\"Scan\" : {\"table\":\"")
.append(getTableName()).append("\"");
if (hasAlias()) {
sb.append(",\"alias\": \"").append(alias);
}
if (hasQual()) {
sb.append(", \"qual\": \"").append(this.qual).append("\"");
}
if (hasTargets()) {
sb.append(", \"target list\": ");
boolean first = true;
for (Target target : targets) {
if (!first) {
sb.append(", ");
}
sb.append(target);
first = false;
}
}
sb.append(",");
sb.append("\n \"out schema\": ").append(getOutSchema());
sb.append("\n \"in schema\": ").append(getInSchema());
return sb.toString();
}
@Override
public int hashCode() {
return Objects.hashCode(this.tableDesc, this.qual, this.targets);
}
@Override
public boolean equals(Object obj) {
if (obj instanceof ScanNode) {
ScanNode other = (ScanNode) obj;
boolean eq = super.equals(other);
eq = eq && TUtil.checkEquals(this.tableDesc, other.tableDesc);
eq = eq && TUtil.checkEquals(this.qual, other.qual);
eq = eq && TUtil.checkEquals(this.targets, other.targets);
return eq;
}
return false;
}
@Override
public Object clone() throws CloneNotSupportedException {
ScanNode scanNode = (ScanNode) super.clone();
scanNode.tableDesc = (TableDesc) this.tableDesc.clone();
if (hasQual()) {
scanNode.qual = (EvalNode) this.qual.clone();
}
if (hasTargets()) {
scanNode.targets = new Target[targets.length];
for (int i = 0; i < targets.length; i++) {
scanNode.targets[i] = (Target) targets[i].clone();
}
}
return scanNode;
}
@Override
public void preOrder(LogicalNodeVisitor visitor) {
visitor.visit(this);
}
public void postOrder(LogicalNodeVisitor visitor) {
visitor.visit(this);
}
@Override
public PlanString getPlanString() {
PlanString planStr = new PlanString("Scan on ").appendTitle(getTableName());
if (hasAlias()) {
planStr.appendTitle(" as ").appendTitle(alias);
}
if (hasQual()) {
planStr.addExplan("filter: ").appendExplain(this.qual.toString());
}
if (hasTargets()) {
planStr.addExplan("target list: ");
boolean first = true;
for (Target target : targets) {
if (!first) {
planStr.appendExplain(", ");
}
planStr.appendExplain(target.toString());
first = false;
}
}
planStr.addDetail("out schema: ").appendDetail(getOutSchema().toString());
planStr.addDetail("in schema: ").appendDetail(getInSchema().toString());
return planStr;
}
}