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Add shared distributions for Raptor tables
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114
presto-raptor/src/main/java/com/facebook/presto/raptor/metadata/Distribution.java
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| /* | ||
| * 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.raptor.metadata; | ||
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|
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| import com.facebook.presto.spi.PrestoException; | ||
| import com.facebook.presto.spi.type.Type; | ||
| import com.facebook.presto.spi.type.TypeManager; | ||
| import com.google.common.collect.ImmutableList; | ||
| import io.airlift.json.JsonCodec; | ||
| import org.skife.jdbi.v2.StatementContext; | ||
| import org.skife.jdbi.v2.tweak.ResultSetMapper; | ||
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|
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| import javax.inject.Inject; | ||
|
|
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| import java.sql.ResultSet; | ||
| import java.sql.SQLException; | ||
| import java.util.List; | ||
| import java.util.Optional; | ||
|
|
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| import static com.facebook.presto.raptor.RaptorErrorCode.RAPTOR_ERROR; | ||
| import static com.facebook.presto.spi.type.TypeSignature.parseTypeSignature; | ||
| import static io.airlift.json.JsonCodec.listJsonCodec; | ||
| import static java.util.Objects.requireNonNull; | ||
| import static java.util.stream.Collectors.toList; | ||
|
|
||
| public class Distribution | ||
| { | ||
| private static final JsonCodec<List<String>> LIST_CODEC = listJsonCodec(String.class); | ||
|
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| private final long id; | ||
| private final Optional<String> name; | ||
| private final List<Type> columnTypes; | ||
| private final int bucketCount; | ||
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| public Distribution(long id, Optional<String> name, List<Type> columnTypes, int bucketCount) | ||
| { | ||
| this.id = id; | ||
| this.name = requireNonNull(name, "name is null"); | ||
| this.columnTypes = ImmutableList.copyOf(requireNonNull(columnTypes, "columnTypes is null")); | ||
| this.bucketCount = bucketCount; | ||
| } | ||
|
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| public long getId() | ||
| { | ||
| return id; | ||
| } | ||
|
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| public Optional<String> getName() | ||
| { | ||
| return name; | ||
| } | ||
|
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| public List<Type> getColumnTypes() | ||
| { | ||
| return columnTypes; | ||
| } | ||
|
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| public int getBucketCount() | ||
| { | ||
| return bucketCount; | ||
| } | ||
|
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| public static class Mapper | ||
| implements ResultSetMapper<Distribution> | ||
| { | ||
| private final TypeManager typeManager; | ||
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| @Inject | ||
| public Mapper(TypeManager typeManager) | ||
| { | ||
| this.typeManager = requireNonNull(typeManager, "typeManager is null"); | ||
| } | ||
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| @Override | ||
| public Distribution map(int index, ResultSet rs, StatementContext ctx) | ||
| throws SQLException | ||
| { | ||
| List<String> typeNames = LIST_CODEC.fromJson(rs.getString("column_types")); | ||
|
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| ImmutableList.Builder<Type> types = ImmutableList.builder(); | ||
| for (String typeName : typeNames) { | ||
| Type type = typeManager.getType(parseTypeSignature(typeName)); | ||
| if (type == null) { | ||
| throw new PrestoException(RAPTOR_ERROR, "Unknown distribution column type: " + typeName); | ||
| } | ||
| types.add(type); | ||
| } | ||
|
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| return new Distribution( | ||
| rs.getLong("distribution_id"), | ||
| Optional.ofNullable(rs.getString("distribution_name")), | ||
| types.build(), | ||
| rs.getInt("bucket_count")); | ||
| } | ||
| } | ||
|
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| public static String serializeColumnTypes(List<Type> columnTypes) | ||
| { | ||
| return LIST_CODEC.toJson(columnTypes.stream() | ||
| .map(type -> type.getTypeSignature().toString()) | ||
| .collect(toList())); | ||
| } | ||
| } |
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