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Add Iceberg metadata table $metadata_log_entries
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144
presto-iceberg/src/main/java/com/facebook/presto/iceberg/MetadataLogTable.java
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|---|---|---|
| @@ -0,0 +1,144 @@ | ||
| /* | ||
| * 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.iceberg; | ||
|
|
||
| import com.facebook.presto.common.predicate.TupleDomain; | ||
| import com.facebook.presto.common.type.Type; | ||
| import com.facebook.presto.spi.ColumnMetadata; | ||
| import com.facebook.presto.spi.ConnectorSession; | ||
| import com.facebook.presto.spi.ConnectorTableMetadata; | ||
| import com.facebook.presto.spi.InMemoryRecordSet; | ||
| import com.facebook.presto.spi.RecordCursor; | ||
| import com.facebook.presto.spi.SchemaTableName; | ||
| import com.facebook.presto.spi.SystemTable; | ||
| import com.facebook.presto.spi.connector.ConnectorTransactionHandle; | ||
| import com.google.common.collect.ImmutableList; | ||
| import org.apache.iceberg.BaseTable; | ||
| import org.apache.iceberg.Snapshot; | ||
| import org.apache.iceberg.Table; | ||
| import org.apache.iceberg.TableMetadata; | ||
| import org.apache.iceberg.TableMetadata.MetadataLogEntry; | ||
|
|
||
| import java.util.Arrays; | ||
| import java.util.Iterator; | ||
| import java.util.List; | ||
| import java.util.stream.Collectors; | ||
|
|
||
| import static com.facebook.presto.common.type.BigintType.BIGINT; | ||
| import static com.facebook.presto.common.type.DateTimeEncoding.packDateTimeWithZone; | ||
| import static com.facebook.presto.common.type.IntegerType.INTEGER; | ||
| import static com.facebook.presto.common.type.TimestampWithTimeZoneType.TIMESTAMP_WITH_TIME_ZONE; | ||
| import static com.facebook.presto.common.type.VarcharType.VARCHAR; | ||
| import static java.util.Objects.requireNonNull; | ||
| import static org.apache.iceberg.util.SnapshotUtil.snapshotIdAsOfTime; | ||
|
|
||
| public class MetadataLogTable | ||
| implements SystemTable | ||
| { | ||
| private final ConnectorTableMetadata tableMetadata; | ||
| private final Table icebergTable; | ||
|
|
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| private static final List<ColumnMetadata> COLUMN_DEFINITIONS = ImmutableList.<ColumnMetadata>builder() | ||
| .add(new ColumnMetadata("timestamp", TIMESTAMP_WITH_TIME_ZONE)) | ||
| .add(new ColumnMetadata("file", VARCHAR)) | ||
| .add(new ColumnMetadata("latest_snapshot_id", BIGINT)) | ||
| .add(new ColumnMetadata("latest_schema_id", INTEGER)) | ||
| .add(new ColumnMetadata("latest_sequence_number", BIGINT)) | ||
| .build(); | ||
|
|
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| private static final List<Type> COLUMN_TYPES = COLUMN_DEFINITIONS.stream() | ||
| .map(ColumnMetadata::getType) | ||
| .collect(Collectors.toList()); | ||
|
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| public MetadataLogTable(SchemaTableName tableName, Table icebergTable) | ||
| { | ||
| tableMetadata = new ConnectorTableMetadata(requireNonNull(tableName, "tableName is null"), COLUMN_DEFINITIONS); | ||
| this.icebergTable = requireNonNull(icebergTable, "icebergTable is null"); | ||
| } | ||
|
|
||
| @Override | ||
| public Distribution getDistribution() | ||
| { | ||
| return Distribution.SINGLE_COORDINATOR; | ||
| } | ||
|
|
||
| @Override | ||
| public ConnectorTableMetadata getTableMetadata() | ||
| { | ||
| return tableMetadata; | ||
| } | ||
|
|
||
| @Override | ||
| public RecordCursor cursor(ConnectorTransactionHandle transactionHandle, ConnectorSession session, TupleDomain<Integer> constraint) | ||
| { | ||
| Iterable<List<?>> rowIterable = () -> new Iterator<List<?>>() | ||
| { | ||
| private final Iterator<MetadataLogEntry> metadataLogEntriesIterator = ((BaseTable) icebergTable).operations().current().previousFiles().iterator(); | ||
| private boolean addedLatestEntry; | ||
|
|
||
| @Override | ||
| public boolean hasNext() | ||
| { | ||
| return metadataLogEntriesIterator.hasNext() || !addedLatestEntry; | ||
| } | ||
|
|
||
| @Override | ||
| public List<?> next() | ||
| { | ||
| if (metadataLogEntriesIterator.hasNext()) { | ||
| return processMetadataLogEntries(session, metadataLogEntriesIterator.next()); | ||
| } | ||
| if (!addedLatestEntry) { | ||
| addedLatestEntry = true; | ||
| TableMetadata currentMetadata = ((BaseTable) icebergTable).operations().current(); | ||
| return buildLatestMetadataRow(session, currentMetadata); | ||
| } | ||
| return null; | ||
| } | ||
| }; | ||
| return new InMemoryRecordSet(COLUMN_TYPES, rowIterable).cursor(); | ||
| } | ||
|
|
||
| private List<?> processMetadataLogEntries(ConnectorSession session, MetadataLogEntry metadataLogEntry) | ||
| { | ||
| Long snapshotId = null; | ||
| Snapshot snapshot = null; | ||
| try { | ||
| snapshotId = snapshotIdAsOfTime(icebergTable, metadataLogEntry.timestampMillis()); | ||
| snapshot = icebergTable.snapshot(snapshotId); | ||
| } | ||
| catch (IllegalArgumentException ignored) { | ||
| // Implies this metadata file was created during table creation | ||
| } | ||
| return addRow(session, metadataLogEntry.timestampMillis(), metadataLogEntry.file(), snapshotId, snapshot); | ||
| } | ||
|
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| private List<?> buildLatestMetadataRow(ConnectorSession session, TableMetadata metadata) | ||
| { | ||
| Snapshot latestSnapshot = icebergTable.currentSnapshot(); | ||
| Long latestSnapshotId = (latestSnapshot != null) ? latestSnapshot.snapshotId() : null; | ||
|
|
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| return addRow(session, metadata.lastUpdatedMillis(), metadata.metadataFileLocation(), latestSnapshotId, latestSnapshot); | ||
| } | ||
|
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| private List<?> addRow(ConnectorSession session, long timestampMillis, String fileLocation, Long snapshotId, Snapshot snapshot) | ||
| { | ||
| return Arrays.asList( | ||
| packDateTimeWithZone(timestampMillis, session.getSqlFunctionProperties().getTimeZoneKey()), | ||
| fileLocation, | ||
| snapshotId, | ||
| snapshot != null ? snapshot.schemaId() : null, | ||
| snapshot != null ? snapshot.sequenceNumber() : null); | ||
| } | ||
| } |
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