/*
* Licensed 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 com.facebook.presto.tpch.testing;
import com.facebook.presto.spi.RecordCursor;
import com.facebook.presto.spi.RecordSet;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.spi.ConnectorColumnHandle;
import com.facebook.presto.spi.ConnectorSplit;
import com.facebook.presto.tpch.TpchColumnHandle;
import com.facebook.presto.tpch.TpchMetadata;
import com.facebook.presto.tpch.TpchRecordSetProvider;
import com.facebook.presto.tpch.TpchSplit;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import io.airlift.slice.Slice;
import java.util.ArrayList;
import java.util.List;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
import static com.google.common.base.Preconditions.checkNotNull;
public class SampledTpchRecordSetProvider
extends TpchRecordSetProvider
{
private final TpchMetadata metadata;
private final int sampleWeight;
public SampledTpchRecordSetProvider(String connectorId, int sampleWeight)
{
this.metadata = new TpchMetadata(connectorId);
this.sampleWeight = sampleWeight;
}
@Override
public RecordSet getRecordSet(ConnectorSplit split, List<? extends ConnectorColumnHandle> columns)
{
int sampleWeightField = -1;
for (int i = 0; i < columns.size(); i++) {
ConnectorColumnHandle column = columns.get(i);
if (column instanceof TpchColumnHandle && ((TpchColumnHandle) column).getColumnName().equals(SampledTpchMetadata.SAMPLE_WEIGHT_COLUMN_NAME)) {
sampleWeightField = i;
break;
}
}
List<? extends ConnectorColumnHandle> delegatedColumns = new ArrayList<>(columns);
if (sampleWeightField > -1) {
delegatedColumns.remove(sampleWeightField);
RecordSet recordSet;
if (delegatedColumns.isEmpty()) {
// Pick a random column, so that we can figure out how many rows there are
TpchSplit tpchSplit = (TpchSplit) split;
ConnectorColumnHandle column = Iterables.getFirst(metadata.getColumnHandles(tpchSplit.getTableHandle()).values(), null);
checkNotNull(column, "Could not find any columns");
recordSet = new EmptyRecordSet(super.getRecordSet(split, ImmutableList.of(column)));
}
else {
recordSet = super.getRecordSet(split, delegatedColumns);
}
return new SampledTpchRecordSet(recordSet, sampleWeightField, sampleWeight);
}
else {
return super.getRecordSet(split, columns);
}
}
private static class EmptyRecordSet
implements RecordSet
{
private final RecordSet delegate;
EmptyRecordSet(RecordSet delegate)
{
this.delegate = delegate;
}
@Override
public List<Type> getColumnTypes()
{
return ImmutableList.of();
}
@Override
public RecordCursor cursor()
{
return new EmptyRecordCursor(delegate.cursor());
}
}
private static class EmptyRecordCursor
implements RecordCursor
{
private final RecordCursor delegate;
EmptyRecordCursor(RecordCursor delegate)
{
this.delegate = delegate;
}
@Override
public long getTotalBytes()
{
return 0;
}
@Override
public long getCompletedBytes()
{
return 0;
}
@Override
public long getReadTimeNanos()
{
return 0;
}
@Override
public Type getType(int field)
{
throw new RuntimeException("record cursor is empty");
}
@Override
public boolean advanceNextPosition()
{
return delegate.advanceNextPosition();
}
@Override
public boolean getBoolean(int field)
{
throw new RuntimeException("record cursor is empty");
}
@Override
public long getLong(int field)
{
throw new RuntimeException("record cursor is empty");
}
@Override
public double getDouble(int field)
{
throw new RuntimeException("record cursor is empty");
}
@Override
public Slice getSlice(int field)
{
throw new RuntimeException("record cursor is empty");
}
@Override
public boolean isNull(int field)
{
throw new RuntimeException("record cursor is empty");
}
@Override
public void close()
{
}
}
private static class SampledTpchRecordSet
implements RecordSet
{
private final RecordSet delegate;
private final int sampleWeightField;
private final int sampleWeight;
SampledTpchRecordSet(RecordSet delegate, int sampleWeightField, int sampleWeight)
{
this.delegate = delegate;
this.sampleWeightField = sampleWeightField;
this.sampleWeight = sampleWeight;
}
@Override
public List<Type> getColumnTypes()
{
List<Type> types = new ArrayList<>();
types.addAll(delegate.getColumnTypes());
types.add(sampleWeightField, BIGINT);
return ImmutableList.copyOf(types);
}
@Override
public RecordCursor cursor()
{
return new SampledTpchRecordCursor(delegate.cursor(), sampleWeightField, sampleWeight);
}
}
private static class SampledTpchRecordCursor
implements RecordCursor
{
private final RecordCursor delegate;
private final int sampleWeightField;
private final int sampleWeight;
public SampledTpchRecordCursor(RecordCursor delegate, int sampleWeightField, int sampleWeight)
{
this.delegate = delegate;
this.sampleWeightField = sampleWeightField;
this.sampleWeight = sampleWeight;
}
@Override
public boolean isNull(int field)
{
if (field == sampleWeightField) {
return false;
}
else {
return delegate.isNull(field);
}
}
@Override
public void close()
{
delegate.close();
}
@Override
public long getLong(int field)
{
if (field == sampleWeightField) {
return sampleWeight;
}
else {
return delegate.getLong(field);
}
}
@Override
public double getDouble(int field)
{
return delegate.getDouble(field);
}
@Override
public Slice getSlice(int field)
{
return delegate.getSlice(field);
}
@Override
public long getTotalBytes()
{
return delegate.getTotalBytes();
}
@Override
public long getCompletedBytes()
{
return delegate.getCompletedBytes();
}
@Override
public long getReadTimeNanos()
{
return 0;
}
@Override
public Type getType(int field)
{
if (field == sampleWeightField) {
return BIGINT;
}
else {
return delegate.getType(field);
}
}
@Override
public boolean advanceNextPosition()
{
return delegate.advanceNextPosition();
}
@Override
public boolean getBoolean(int field)
{
return delegate.getBoolean(field);
}
}
}