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63 changes: 63 additions & 0 deletions
63
exec/java-exec/src/main/java/org/apache/drill/exec/physical/config/Limit.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| /******************************************************************************* | ||
| * 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.physical.config; | ||
|
|
||
| import com.fasterxml.jackson.annotation.JsonCreator; | ||
| import com.fasterxml.jackson.annotation.JsonProperty; | ||
| import com.fasterxml.jackson.annotation.JsonTypeName; | ||
| import org.apache.drill.common.expression.LogicalExpression; | ||
| import org.apache.drill.exec.physical.OperatorCost; | ||
| import org.apache.drill.exec.physical.base.AbstractSingle; | ||
| import org.apache.drill.exec.physical.base.PhysicalOperator; | ||
| import org.apache.drill.exec.physical.base.PhysicalVisitor; | ||
|
|
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| @JsonTypeName("limit") | ||
| public class Limit extends AbstractSingle { | ||
| private final Integer first; | ||
| private final Integer last; | ||
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| @JsonCreator | ||
| public Limit(@JsonProperty("child") PhysicalOperator child, @JsonProperty("first") Integer first, @JsonProperty("last") Integer last) { | ||
| super(child); | ||
| this.first = first; | ||
| this.last = last; | ||
| } | ||
|
|
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| public Integer getFirst() { | ||
| return first; | ||
| } | ||
|
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| public Integer getLast() { | ||
| return last; | ||
| } | ||
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| @Override | ||
| protected PhysicalOperator getNewWithChild(PhysicalOperator child) { | ||
| return new Limit(child, first, last); | ||
| } | ||
|
|
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| @Override | ||
| public OperatorCost getCost() { | ||
| return new OperatorCost(0, 0, 0, 0.25f); | ||
| } | ||
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| @Override | ||
| public <T, X, E extends Throwable> T accept(PhysicalVisitor<T, X, E> physicalVisitor, X value) throws E { | ||
| return physicalVisitor.visitLimit(this, value); | ||
| } | ||
| } |
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17 changes: 17 additions & 0 deletions
17
.../java-exec/src/main/java/org/apache/drill/exec/physical/impl/limit/LimitBatchCreator.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,17 @@ | ||
| package org.apache.drill.exec.physical.impl.limit; | ||
|
|
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| import com.google.common.collect.Iterables; | ||
| import org.apache.drill.common.exceptions.ExecutionSetupException; | ||
| import org.apache.drill.exec.ops.FragmentContext; | ||
| import org.apache.drill.exec.physical.config.Limit; | ||
| import org.apache.drill.exec.physical.impl.BatchCreator; | ||
| import org.apache.drill.exec.record.RecordBatch; | ||
|
|
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| import java.util.List; | ||
|
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| public class LimitBatchCreator implements BatchCreator<Limit> { | ||
| @Override | ||
| public RecordBatch getBatch(FragmentContext context, Limit config, List<RecordBatch> children) throws ExecutionSetupException { | ||
| return new LimitRecordBatch(config, context, Iterables.getOnlyElement(children)); | ||
| } | ||
| } |
107 changes: 107 additions & 0 deletions
107
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/limit/LimitRecordBatch.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,107 @@ | ||
| package org.apache.drill.exec.physical.impl.limit; | ||
|
|
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| import com.beust.jcommander.internal.Lists; | ||
| import com.google.common.base.Objects; | ||
| import org.apache.drill.exec.exception.SchemaChangeException; | ||
| import org.apache.drill.exec.ops.FragmentContext; | ||
| import org.apache.drill.exec.physical.config.Limit; | ||
| import org.apache.drill.exec.record.*; | ||
| import org.apache.drill.exec.record.selection.SelectionVector2; | ||
| import org.apache.drill.exec.vector.ValueVector; | ||
|
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| import java.util.List; | ||
|
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| public class LimitRecordBatch extends AbstractSingleRecordBatch<Limit> { | ||
|
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| private SelectionVector2 outgoingSv; | ||
| private SelectionVector2 incomingSv; | ||
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| public LimitRecordBatch(Limit popConfig, FragmentContext context, RecordBatch incoming) { | ||
| super(popConfig, context, incoming); | ||
| outgoingSv = new SelectionVector2(context.getAllocator()); | ||
| } | ||
|
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| @Override | ||
| protected void setupNewSchema() throws SchemaChangeException { | ||
| container.clear(); | ||
|
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| List<TransferPair> transfers = Lists.newArrayList(); | ||
|
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| for(VectorWrapper<?> v : incoming){ | ||
| TransferPair pair = v.getValueVector().getTransferPair(); | ||
| container.add(pair.getTo()); | ||
| transfers.add(pair); | ||
| } | ||
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| BatchSchema.SelectionVectorMode svMode = incoming.getSchema().getSelectionVectorMode(); | ||
|
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| switch(svMode){ | ||
| case NONE: | ||
| break; | ||
| case TWO_BYTE: | ||
| this.incomingSv = incoming.getSelectionVector2(); | ||
| break; | ||
| default: | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
|
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| container.buildSchema(BatchSchema.SelectionVectorMode.TWO_BYTE); | ||
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| for(TransferPair tp : transfers) { | ||
| tp.transfer(); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public SelectionVector2 getSelectionVector2() { | ||
| return outgoingSv; | ||
| } | ||
|
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| @Override | ||
| protected void doWork() { | ||
| int recordCount = incoming.getRecordCount(); | ||
| outgoingSv.allocateNew(recordCount); | ||
|
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| if(incomingSv != null) { | ||
| limitWithSV(recordCount); | ||
| } else { | ||
| limitWithNoSV(recordCount); | ||
| } | ||
| } | ||
|
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| private void limitWithNoSV(int recordCount) { | ||
| int svIndex = 0; | ||
| int offset = Math.max(0, Objects.firstNonNull(popConfig.getFirst(), 0)); | ||
| int fetch = Math.min(recordCount, Objects.firstNonNull(popConfig.getLast(), recordCount)); | ||
| for(char i = (char) offset; i < fetch; i++) { | ||
| outgoingSv.setIndex(svIndex, i); | ||
| svIndex++; | ||
| } | ||
| outgoingSv.setRecordCount(svIndex); | ||
| } | ||
|
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| private void limitWithSV(int recordCount) { | ||
| int svIndex = 0; | ||
| int offset = Math.max(0, Objects.firstNonNull(popConfig.getFirst(), 0)); | ||
| int fetch = Math.min(recordCount, Objects.firstNonNull(popConfig.getLast(), recordCount)); | ||
| for(int i = offset; i < fetch; i++) { | ||
| char index = incomingSv.getIndex(i); | ||
| outgoingSv.setIndex(svIndex, index); | ||
| svIndex++; | ||
| } | ||
|
|
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| outgoingSv.setRecordCount(svIndex); | ||
| } | ||
|
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| @Override | ||
| public int getRecordCount() { | ||
| return outgoingSv.getCount(); | ||
| } | ||
|
|
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| @Override | ||
| protected void cleanup(){ | ||
| super.cleanup(); | ||
| outgoingSv.clear(); | ||
| } | ||
| } |
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