/**
* 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.planner.physical;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.planner.common.DrillProjectRelBase;
import org.apache.drill.exec.planner.logical.DrillParseContext;
import org.apache.drill.exec.planner.physical.visitor.PrelVisitor;
import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
import org.apache.calcite.rel.core.Project;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.plan.RelOptCluster;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.rex.RexCall;
import org.apache.calcite.rex.RexNode;
import org.apache.calcite.sql.SqlKind;
public class ProjectPrel extends DrillProjectRelBase implements Prel{
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(ProjectPrel.class);
public ProjectPrel(RelOptCluster cluster, RelTraitSet traits, RelNode child, List<RexNode> exps,
RelDataType rowType) {
super(DRILL_PHYSICAL, cluster, traits, child, exps, rowType);
}
@Override
public Project copy(RelTraitSet traitSet, RelNode input, List<RexNode> exps, RelDataType rowType) {
return new ProjectPrel(getCluster(), traitSet, input, exps, rowType);
}
@Override
public PhysicalOperator getPhysicalOperator(PhysicalPlanCreator creator) throws IOException {
Prel child = (Prel) this.getInput();
PhysicalOperator childPOP = child.getPhysicalOperator(creator);
org.apache.drill.exec.physical.config.Project p = new org.apache.drill.exec.physical.config.Project(
this.getProjectExpressions(new DrillParseContext(PrelUtil.getSettings(getCluster()))), childPOP);
return creator.addMetadata(this, p);
}
@Override
public Iterator<Prel> iterator() {
return PrelUtil.iter(getInput());
}
@Override
public <T, X, E extends Throwable> T accept(PrelVisitor<T, X, E> logicalVisitor, X value) throws E {
return logicalVisitor.visitProject(this, value);
}
@Override
public SelectionVectorMode[] getSupportedEncodings() {
return SelectionVectorMode.DEFAULT;
}
@Override
public SelectionVectorMode getEncoding() {
return SelectionVectorMode.NONE;
}
/**
* Whether this Project requires a final column re-ordering. Returns False for all cases except when
* convert_fromjson function is present. For convert_fromjson function, the Project operator at
* run-time produces an output schema with convert_fromjson expr appended to the end of the schema.
* We need a final column re-ordering to ensure the correct column order.
*/
@Override
public boolean needsFinalColumnReordering() {
for (RexNode expr : this.exps) {
// TODO: a convert_fromjson nested within other convert functions currently does not work.
// When it is supported, we should enhance this check by using a visitor to find the nested function.
if (expr.getKind() == SqlKind.OTHER_FUNCTION &&
expr instanceof RexCall &&
((RexCall) expr).getOperator().getName().equalsIgnoreCase("CONVERT_FROMJSON")) {
return true;
}
}
return false;
}
}