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CarbondataSplitManager.java
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CarbondataSplitManager.java
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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.carbondata.presto;
import javax.inject.Inject;
import java.util.List;
import java.util.Optional;
import org.apache.carbondata.core.scan.expression.Expression;
import org.apache.carbondata.presto.impl.CarbonLocalInputSplit;
import org.apache.carbondata.presto.impl.CarbonTableCacheModel;
import org.apache.carbondata.presto.impl.CarbonTableReader;
import com.facebook.presto.spi.ColumnHandle;
import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.spi.ConnectorSplit;
import com.facebook.presto.spi.ConnectorSplitSource;
import com.facebook.presto.spi.ConnectorTableLayoutHandle;
import com.facebook.presto.spi.FixedSplitSource;
import com.facebook.presto.spi.SchemaTableName;
import com.facebook.presto.spi.connector.ConnectorSplitManager;
import com.facebook.presto.spi.connector.ConnectorTransactionHandle;
import com.facebook.presto.spi.predicate.TupleDomain;
import com.google.common.collect.ImmutableList;
import static java.util.Objects.requireNonNull;
import static org.apache.carbondata.presto.Types.checkType;
/**
* Build Carbontable splits
* filtering irrelevant blocks
*/
public class CarbondataSplitManager implements ConnectorSplitManager {
private final String connectorId;
private final CarbonTableReader carbonTableReader;
@Inject
public CarbondataSplitManager(CarbondataConnectorId connectorId, CarbonTableReader reader) {
this.connectorId = requireNonNull(connectorId, "connectorId is null").toString();
this.carbonTableReader = requireNonNull(reader, "client is null");
}
public ConnectorSplitSource getSplits(ConnectorTransactionHandle transactionHandle,
ConnectorSession session, ConnectorTableLayoutHandle layout) {
CarbondataTableLayoutHandle layoutHandle = (CarbondataTableLayoutHandle) layout;
CarbondataTableHandle tableHandle = layoutHandle.getTable();
SchemaTableName key = tableHandle.getSchemaTableName();
// Packaging presto-TupleDomain into CarbondataColumnConstraint, to decouple from presto-spi Module
List<CarbondataColumnConstraint> rebuildConstraints =
getColumnConstraints(layoutHandle.getConstraint());
CarbonTableCacheModel cache = carbonTableReader.getCarbonCache(key);
Expression filters = PrestoFilterUtil.parseFilterExpression(layoutHandle.getConstraint());
try {
List<CarbonLocalInputSplit> splits = carbonTableReader.getInputSplits2(cache, filters);
ImmutableList.Builder<ConnectorSplit> cSplits = ImmutableList.builder();
for (CarbonLocalInputSplit split : splits) {
cSplits.add(new CarbondataSplit(connectorId, tableHandle.getSchemaTableName(),
layoutHandle.getConstraint(), split, rebuildConstraints));
}
return new FixedSplitSource(cSplits.build());
} catch (Exception ex) {
throw new RuntimeException(ex.getMessage(), ex);
}
}
/**
*
* @param constraint
* @return
*/
public List<CarbondataColumnConstraint> getColumnConstraints(
TupleDomain<ColumnHandle> constraint) {
ImmutableList.Builder<CarbondataColumnConstraint> constraintBuilder = ImmutableList.builder();
for (TupleDomain.ColumnDomain<ColumnHandle> columnDomain : constraint.getColumnDomains()
.get()) {
CarbondataColumnHandle columnHandle =
checkType(columnDomain.getColumn(), CarbondataColumnHandle.class, "column handle");
constraintBuilder.add(new CarbondataColumnConstraint(columnHandle.getColumnName(),
Optional.of(columnDomain.getDomain()), columnHandle.isInvertedIndex()));
}
return constraintBuilder.build();
}
}