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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.planner.physical;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import org.apache.calcite.plan.RelOptCluster;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.RelWriter;
import org.apache.calcite.rel.core.Correlate;
import org.apache.calcite.rel.core.CorrelationId;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.rel.type.RelDataTypeField;
import org.apache.calcite.rex.RexNode;
import org.apache.calcite.rex.RexUtil;
import org.apache.calcite.sql.SemiJoinType;
import org.apache.calcite.util.ImmutableBitSet;
import org.apache.commons.collections.ListUtils;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.physical.config.LateralJoinPOP;
import org.apache.drill.exec.planner.common.DrillLateralJoinRelBase;
import org.apache.drill.exec.planner.common.DrillJoinRelBase;
import org.apache.drill.exec.planner.physical.visitor.PrelVisitor;
import org.apache.drill.exec.record.BatchSchema;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class LateralJoinPrel extends DrillLateralJoinRelBase implements Prel {
protected LateralJoinPrel(RelOptCluster cluster, RelTraitSet traits, RelNode left, RelNode right, boolean excludeCorrelateCol,
CorrelationId correlationId, ImmutableBitSet requiredColumns, SemiJoinType semiJoinType) {
super(cluster, traits, left, right, excludeCorrelateCol, correlationId, requiredColumns, semiJoinType);
}
@Override
public Correlate copy(RelTraitSet traitSet,
RelNode left, RelNode right, CorrelationId correlationId,
ImmutableBitSet requiredColumns, SemiJoinType joinType) {
return new LateralJoinPrel(this.getCluster(), this.getTraitSet(), left, right, this.excludeCorrelateColumn, correlationId, requiredColumns,
this.getJoinType());
}
@Override
public PhysicalOperator getPhysicalOperator(PhysicalPlanCreator creator) throws IOException {
PhysicalOperator leftPop = ((Prel)left).getPhysicalOperator(creator);
PhysicalOperator rightPop = ((Prel)right).getPhysicalOperator(creator);
SemiJoinType jtype = this.getJoinType();
List<SchemaPath> excludedColumns = new ArrayList<>();
if (getColumn() != null) {
excludedColumns.add(getColumn());
}
LateralJoinPOP ljoin = new LateralJoinPOP(leftPop, rightPop, jtype.toJoinType(), DrillLateralJoinRelBase.IMPLICIT_COLUMN, excludedColumns);
return creator.addMetadata(this, ljoin);
}
private SchemaPath getColumn() {
if (this.excludeCorrelateColumn) {
int index = this.getRequiredColumns().asList().get(0);
return SchemaPath.getSimplePath(this.getInput(0).getRowType().getFieldNames().get(index));
}
return null;
}
/**
* Check to make sure that the fields of the inputs are the same as the output field names.
* If not, insert a project renaming them.
*/
public RelNode getLateralInput(int ordinal, RelNode input) {
int offset = ordinal == 0 ? 0 : getInputSize(0);
Preconditions.checkArgument(DrillJoinRelBase.uniqueFieldNames(input.getRowType()));
final List<String> fields = getRowType().getFieldNames();
final List<String> inputFields = input.getRowType().getFieldNames();
final List<String> outputFields = fields.subList(offset, offset + getInputSize(ordinal));
if (ListUtils.subtract(outputFields, inputFields).size() != 0) {
// Ensure that input field names are the same as output field names.
// If there are duplicate field names on left and right, fields will get
// lost.
// In such case, we need insert a rename Project on top of the input.
return rename(input, input.getRowType().getFieldList(), outputFields);
} else {
return input;
}
}
private RelNode rename(RelNode input, List<RelDataTypeField> inputFields, List<String> outputFieldNames) {
List<RexNode> exprs = Lists.newArrayList();
for (RelDataTypeField field : inputFields) {
RexNode expr = input.getCluster().getRexBuilder().makeInputRef(field.getType(), field.getIndex());
exprs.add(expr);
}
RelDataType rowType = RexUtil.createStructType(input.getCluster().getTypeFactory(),
exprs, outputFieldNames, null);
ProjectPrel proj = new ProjectPrel(input.getCluster(), input.getTraitSet(), input, exprs, rowType);
return proj;
}
@Override
public RelWriter explainTerms(RelWriter pw) {
if (this.excludeCorrelateColumn) {
return super.explainTerms(pw).item("column excluded from output: ", this.getColumn());
} else {
return super.explainTerms(pw);
}
}
@Override
public <T, X, E extends Throwable> T accept(PrelVisitor<T, X, E> visitor, X value) throws E {
return visitor.visitLateral(this, value);
}
@Override
public Iterator<Prel> iterator() {
return PrelUtil.iter(getLeft(), getRight());
}
@Override
public boolean needsFinalColumnReordering() {
return true;
}
@Override
public BatchSchema.SelectionVectorMode[] getSupportedEncodings() {
return BatchSchema.SelectionVectorMode.DEFAULT;
}
@Override
public BatchSchema.SelectionVectorMode getEncoding() {
return BatchSchema.SelectionVectorMode.NONE;
}
}
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