use of io.prestosql.spi.connector.ConnectorSplitManager.SplitSchedulingStrategy.UNGROUPED_SCHEDULING in project hetu-core by openlookeng.
the class ExtractSpatialJoins method loadKdbTree.
private static KdbTree loadKdbTree(String tableName, Session session, Metadata metadata, SplitManager splitManager, PageSourceManager pageSourceManager, PlanNodeId nodeId) {
QualifiedObjectName name = toQualifiedObjectName(tableName, session.getCatalog().get(), session.getSchema().get());
TableHandle tableHandle = metadata.getTableHandle(session, name).orElseThrow(() -> new PrestoException(INVALID_SPATIAL_PARTITIONING, format("Table not found: %s", name)));
Map<String, ColumnHandle> columnHandles = metadata.getColumnHandles(session, tableHandle);
List<ColumnHandle> visibleColumnHandles = columnHandles.values().stream().filter(handle -> !metadata.getColumnMetadata(session, tableHandle, handle).isHidden()).collect(toImmutableList());
checkSpatialPartitioningTable(visibleColumnHandles.size() == 1, "Expected single column for table %s, but found %s columns", name, columnHandles.size());
ColumnHandle kdbTreeColumn = Iterables.getOnlyElement(visibleColumnHandles);
Optional<KdbTree> kdbTree = Optional.empty();
try (SplitSource splitSource = splitManager.getSplits(session, tableHandle, UNGROUPED_SCHEDULING, null, Optional.empty(), Collections.emptyMap(), ImmutableSet.of(), false, nodeId)) {
while (!Thread.currentThread().isInterrupted()) {
SplitBatch splitBatch = getFutureValue(splitSource.getNextBatch(NOT_PARTITIONED, Lifespan.taskWide(), 1000));
List<Split> splits = splitBatch.getSplits();
for (Split split : splits) {
try (ConnectorPageSource pageSource = pageSourceManager.createPageSource(session, split, tableHandle, ImmutableList.of(kdbTreeColumn), Optional.empty())) {
do {
getFutureValue(pageSource.isBlocked());
Page page = pageSource.getNextPage();
if (page != null && page.getPositionCount() > 0) {
checkSpatialPartitioningTable(!kdbTree.isPresent(), "Expected exactly one row for table %s, but found more", name);
checkSpatialPartitioningTable(page.getPositionCount() == 1, "Expected exactly one row for table %s, but found %s rows", name, page.getPositionCount());
String kdbTreeJson = VARCHAR.getSlice(page.getBlock(0), 0).toStringUtf8();
try {
kdbTree = Optional.of(KdbTreeUtils.fromJson(kdbTreeJson));
} catch (IllegalArgumentException e) {
checkSpatialPartitioningTable(false, "Invalid JSON string for KDB tree: %s", e.getMessage());
}
}
} while (!pageSource.isFinished());
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
if (splitBatch.isLastBatch()) {
break;
}
}
}
checkSpatialPartitioningTable(kdbTree.isPresent(), "Expected exactly one row for table %s, but got none", name);
return kdbTree.get();
}
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