/*
* 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.hive;
import com.facebook.presto.spi.PrestoException;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import org.apache.hadoop.hive.metastore.api.StorageDescriptor;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import static com.facebook.presto.hive.HiveErrorCode.HIVE_INVALID_METADATA;
import static com.google.common.base.MoreObjects.toStringHelper;
import static java.util.Objects.requireNonNull;
public class HiveBucketProperty
{
private final List<String> bucketedBy;
private final int bucketCount;
@JsonCreator
public HiveBucketProperty(
@JsonProperty("bucketedBy") List<String> bucketedBy,
@JsonProperty("bucketCount") int bucketCount)
{
this.bucketedBy = requireNonNull(bucketedBy, "bucketedBy is null");
this.bucketCount = requireNonNull(bucketCount, "bucketCount is null");
}
public static Optional<HiveBucketProperty> fromStorageDescriptor(StorageDescriptor storageDescriptor, String tablePartitionName)
{
boolean bucketColsSet = storageDescriptor.isSetBucketCols() && !storageDescriptor.getBucketCols().isEmpty();
boolean numBucketsSet = storageDescriptor.isSetNumBuckets() && storageDescriptor.getNumBuckets() > 0;
if (!numBucketsSet) {
// In Hive, a table is considered as not bucketed when its bucketCols is set but its numBucket is not set.
return Optional.empty();
}
if (!bucketColsSet) {
throw new PrestoException(HIVE_INVALID_METADATA, "Table/partition metadata has 'numBuckets' set, but 'bucketCols' is not set: " + tablePartitionName);
}
return Optional.of(new HiveBucketProperty(storageDescriptor.getBucketCols(), storageDescriptor.getNumBuckets()));
}
@JsonProperty
public List<String> getBucketedBy()
{
return bucketedBy;
}
@JsonProperty
public int getBucketCount()
{
return bucketCount;
}
@Override
public boolean equals(Object o)
{
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
HiveBucketProperty that = (HiveBucketProperty) o;
return bucketCount == that.bucketCount &&
Objects.equals(bucketedBy, that.bucketedBy);
}
@Override
public int hashCode()
{
return Objects.hash(bucketedBy, bucketCount);
}
@Override
public String toString()
{
return toStringHelper(this)
.add("bucketedBy", bucketedBy)
.add("bucketCount", bucketCount)
.toString();
}
}