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io.trino.sql.planner.PlanFragmenter Maven / Gradle / Ivy
/*
* 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 io.trino.sql.planner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
import com.google.inject.Inject;
import io.trino.Session;
import io.trino.connector.CatalogProperties;
import io.trino.cost.StatsAndCosts;
import io.trino.execution.QueryManagerConfig;
import io.trino.execution.warnings.WarningCollector;
import io.trino.metadata.CatalogInfo;
import io.trino.metadata.CatalogManager;
import io.trino.metadata.FunctionManager;
import io.trino.metadata.LanguageFunctionManager;
import io.trino.metadata.LanguageScalarFunctionData;
import io.trino.metadata.Metadata;
import io.trino.metadata.TableHandle;
import io.trino.metadata.TableProperties.TablePartitioning;
import io.trino.operator.RetryPolicy;
import io.trino.spi.TrinoException;
import io.trino.spi.TrinoWarning;
import io.trino.spi.connector.ConnectorPartitioningHandle;
import io.trino.spi.type.Type;
import io.trino.sql.planner.plan.ExchangeNode;
import io.trino.sql.planner.plan.ExplainAnalyzeNode;
import io.trino.sql.planner.plan.MergeWriterNode;
import io.trino.sql.planner.plan.OutputNode;
import io.trino.sql.planner.plan.PlanFragmentId;
import io.trino.sql.planner.plan.PlanNode;
import io.trino.sql.planner.plan.PlanNodeId;
import io.trino.sql.planner.plan.RefreshMaterializedViewNode;
import io.trino.sql.planner.plan.RemoteSourceNode;
import io.trino.sql.planner.plan.SimplePlanRewriter;
import io.trino.sql.planner.plan.SimpleTableExecuteNode;
import io.trino.sql.planner.plan.StatisticsWriterNode;
import io.trino.sql.planner.plan.TableDeleteNode;
import io.trino.sql.planner.plan.TableExecuteNode;
import io.trino.sql.planner.plan.TableFinishNode;
import io.trino.sql.planner.plan.TableFunctionNode;
import io.trino.sql.planner.plan.TableFunctionProcessorNode;
import io.trino.sql.planner.plan.TableScanNode;
import io.trino.sql.planner.plan.TableUpdateNode;
import io.trino.sql.planner.plan.TableWriterNode;
import io.trino.sql.planner.plan.ValuesNode;
import io.trino.transaction.TransactionManager;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.base.Predicates.in;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static io.trino.SystemSessionProperties.getQueryMaxStageCount;
import static io.trino.SystemSessionProperties.getRetryPolicy;
import static io.trino.SystemSessionProperties.isForceSingleNodeOutput;
import static io.trino.spi.StandardErrorCode.QUERY_HAS_TOO_MANY_STAGES;
import static io.trino.spi.connector.StandardWarningCode.TOO_MANY_STAGES;
import static io.trino.sql.planner.SchedulingOrderVisitor.scheduleOrder;
import static io.trino.sql.planner.SystemPartitioningHandle.COORDINATOR_DISTRIBUTION;
import static io.trino.sql.planner.SystemPartitioningHandle.FIXED_HASH_DISTRIBUTION;
import static io.trino.sql.planner.SystemPartitioningHandle.SCALED_WRITER_HASH_DISTRIBUTION;
import static io.trino.sql.planner.SystemPartitioningHandle.SINGLE_DISTRIBUTION;
import static io.trino.sql.planner.SystemPartitioningHandle.SOURCE_DISTRIBUTION;
import static io.trino.sql.planner.plan.ExchangeNode.Scope.REMOTE;
import static io.trino.sql.planner.planprinter.PlanPrinter.jsonFragmentPlan;
import static java.lang.String.format;
import static java.util.Objects.requireNonNull;
/**
* Splits a logical plan into fragments that can be shipped and executed on distributed nodes
*/
public class PlanFragmenter
{
private static final String TOO_MANY_STAGES_MESSAGE = "" +
"If the query contains multiple aggregates with DISTINCT over different columns, please set the 'mark_distinct_strategy' session property to 'none'. " +
"If the query contains WITH clauses that are referenced more than once, please create temporary table(s) for the queries in those clauses.";
private final Metadata metadata;
private final FunctionManager functionManager;
private final TransactionManager transactionManager;
private final CatalogManager catalogManager;
private final LanguageFunctionManager languageFunctionManager;
private final int stageCountWarningThreshold;
@Inject
public PlanFragmenter(
Metadata metadata,
FunctionManager functionManager,
TransactionManager transactionManager,
CatalogManager catalogManager,
LanguageFunctionManager languageFunctionManager,
QueryManagerConfig queryManagerConfig)
{
this.metadata = requireNonNull(metadata, "metadata is null");
this.functionManager = requireNonNull(functionManager, "functionManager is null");
this.transactionManager = requireNonNull(transactionManager, "transactionManager is null");
this.catalogManager = requireNonNull(catalogManager, "catalogManager is null");
this.stageCountWarningThreshold = requireNonNull(queryManagerConfig, "queryManagerConfig is null").getStageCountWarningThreshold();
this.languageFunctionManager = requireNonNull(languageFunctionManager, "languageFunctionManager is null");
}
public SubPlan createSubPlans(Session session, Plan plan, boolean forceSingleNode, WarningCollector warningCollector)
{
List activeCatalogs = transactionManager.getActiveCatalogs(session.getTransactionId().orElseThrow()).stream()
.map(CatalogInfo::getCatalogHandle)
.flatMap(catalogHandle -> catalogManager.getCatalogProperties(catalogHandle).stream())
.collect(toImmutableList());
List languageScalarFunctions = languageFunctionManager.serializeFunctionsForWorkers(session);
Fragmenter fragmenter = new Fragmenter(session, metadata, functionManager, plan.getTypes(), plan.getStatsAndCosts(), activeCatalogs, languageScalarFunctions);
FragmentProperties properties = new FragmentProperties(new PartitioningScheme(Partitioning.create(SINGLE_DISTRIBUTION, ImmutableList.of()), plan.getRoot().getOutputSymbols()));
if (forceSingleNode || isForceSingleNodeOutput(session)) {
properties = properties.setSingleNodeDistribution();
}
PlanNode root = SimplePlanRewriter.rewriteWith(fragmenter, plan.getRoot(), properties);
SubPlan subPlan = fragmenter.buildRootFragment(root, properties);
subPlan = reassignPartitioningHandleIfNecessary(session, subPlan);
checkState(!isForceSingleNodeOutput(session) || subPlan.getFragment().getPartitioning().isSingleNode(), "Root of PlanFragment is not single node");
// TODO: Remove query_max_stage_count session property and use queryManagerConfig.getMaxStageCount() here
sanityCheckFragmentedPlan(subPlan, warningCollector, getQueryMaxStageCount(session), stageCountWarningThreshold);
return subPlan;
}
private void sanityCheckFragmentedPlan(SubPlan subPlan, WarningCollector warningCollector, int maxStageCount, int stageCountSoftLimit)
{
subPlan.sanityCheck();
int fragmentCount = subPlan.getAllFragments().size();
if (fragmentCount > maxStageCount) {
throw new TrinoException(QUERY_HAS_TOO_MANY_STAGES, format(
"Number of stages in the query (%s) exceeds the allowed maximum (%s). %s",
fragmentCount,
maxStageCount,
TOO_MANY_STAGES_MESSAGE));
}
if (fragmentCount > stageCountSoftLimit) {
warningCollector.add(new TrinoWarning(TOO_MANY_STAGES, format(
"Number of stages in the query (%s) exceeds the soft limit (%s). %s",
fragmentCount,
stageCountSoftLimit,
TOO_MANY_STAGES_MESSAGE)));
}
}
private SubPlan reassignPartitioningHandleIfNecessary(Session session, SubPlan subPlan)
{
return reassignPartitioningHandleIfNecessaryHelper(session, subPlan, subPlan.getFragment().getPartitioning());
}
private SubPlan reassignPartitioningHandleIfNecessaryHelper(Session session, SubPlan subPlan, PartitioningHandle newOutputPartitioningHandle)
{
PlanFragment fragment = subPlan.getFragment();
PlanNode newRoot = fragment.getRoot();
// If the fragment's partitioning is SINGLE or COORDINATOR_ONLY, leave the sources as is (this is for single-node execution)
if (!fragment.getPartitioning().isSingleNode()) {
PartitioningHandleReassigner partitioningHandleReassigner = new PartitioningHandleReassigner(fragment.getPartitioning(), metadata, session);
newRoot = SimplePlanRewriter.rewriteWith(partitioningHandleReassigner, newRoot);
}
PartitioningScheme outputPartitioningScheme = fragment.getOutputPartitioningScheme();
Partitioning newOutputPartitioning = outputPartitioningScheme.getPartitioning();
if (outputPartitioningScheme.getPartitioning().getHandle().getCatalogHandle().isPresent()) {
// Do not replace the handle if the source's output handle is a system one, e.g. broadcast.
newOutputPartitioning = newOutputPartitioning.withAlternativePartitioningHandle(newOutputPartitioningHandle);
}
PlanFragment newFragment = new PlanFragment(
fragment.getId(),
newRoot,
fragment.getSymbols(),
fragment.getPartitioning(),
fragment.getPartitionCount(),
fragment.getPartitionedSources(),
new PartitioningScheme(
newOutputPartitioning,
outputPartitioningScheme.getOutputLayout(),
outputPartitioningScheme.getHashColumn(),
outputPartitioningScheme.isReplicateNullsAndAny(),
outputPartitioningScheme.getBucketToPartition(),
outputPartitioningScheme.getPartitionCount()),
fragment.getStatsAndCosts(),
fragment.getActiveCatalogs(),
fragment.getLanguageFunctions(),
fragment.getJsonRepresentation());
ImmutableList.Builder childrenBuilder = ImmutableList.builder();
for (SubPlan child : subPlan.getChildren()) {
childrenBuilder.add(reassignPartitioningHandleIfNecessaryHelper(session, child, fragment.getPartitioning()));
}
return new SubPlan(newFragment, childrenBuilder.build());
}
private static class Fragmenter
extends SimplePlanRewriter
{
private static final int ROOT_FRAGMENT_ID = 0;
private final Session session;
private final Metadata metadata;
private final FunctionManager functionManager;
private final TypeProvider types;
private final StatsAndCosts statsAndCosts;
private final List activeCatalogs;
private final List languageFunctions;
private final PlanFragmentIdAllocator idAllocator = new PlanFragmentIdAllocator(ROOT_FRAGMENT_ID + 1);
public Fragmenter(
Session session,
Metadata metadata,
FunctionManager functionManager,
TypeProvider types,
StatsAndCosts statsAndCosts,
List activeCatalogs,
List languageFunctions)
{
this.session = requireNonNull(session, "session is null");
this.metadata = requireNonNull(metadata, "metadata is null");
this.functionManager = requireNonNull(functionManager, "functionManager is null");
this.types = requireNonNull(types, "types is null");
this.statsAndCosts = requireNonNull(statsAndCosts, "statsAndCosts is null");
this.activeCatalogs = requireNonNull(activeCatalogs, "activeCatalogs is null");
this.languageFunctions = requireNonNull(languageFunctions, "languageFunctions is null");
}
public SubPlan buildRootFragment(PlanNode root, FragmentProperties properties)
{
return buildFragment(root, properties, new PlanFragmentId(String.valueOf(ROOT_FRAGMENT_ID)));
}
private SubPlan buildFragment(PlanNode root, FragmentProperties properties, PlanFragmentId fragmentId)
{
Set dependencies = SymbolsExtractor.extractOutputSymbols(root);
List schedulingOrder = scheduleOrder(root);
boolean equals = properties.getPartitionedSources().equals(ImmutableSet.copyOf(schedulingOrder));
checkArgument(equals, "Expected scheduling order (%s) to contain an entry for all partitioned sources (%s)", schedulingOrder, properties.getPartitionedSources());
Map symbols = Maps.filterKeys(types.allTypes(), in(dependencies));
PlanFragment fragment = new PlanFragment(
fragmentId,
root,
symbols,
properties.getPartitioningHandle(),
properties.getPartitionCount(),
schedulingOrder,
properties.getPartitioningScheme(),
statsAndCosts.getForSubplan(root),
activeCatalogs,
languageFunctions,
Optional.of(jsonFragmentPlan(root, symbols, metadata, functionManager, session)));
return new SubPlan(fragment, properties.getChildren());
}
@Override
public PlanNode visitOutput(OutputNode node, RewriteContext context)
{
if (isForceSingleNodeOutput(session)) {
context.get().setSingleNodeDistribution();
}
return context.defaultRewrite(node, context.get());
}
@Override
public PlanNode visitExplainAnalyze(ExplainAnalyzeNode node, RewriteContext context)
{
context.get().setCoordinatorOnlyDistribution();
return context.defaultRewrite(node, context.get());
}
@Override
public PlanNode visitStatisticsWriterNode(StatisticsWriterNode node, RewriteContext context)
{
context.get().setCoordinatorOnlyDistribution();
return context.defaultRewrite(node, context.get());
}
@Override
public PlanNode visitSimpleTableExecuteNode(SimpleTableExecuteNode node, RewriteContext context)
{
context.get().setCoordinatorOnlyDistribution();
return context.defaultRewrite(node, context.get());
}
@Override
public PlanNode visitTableFinish(TableFinishNode node, RewriteContext context)
{
context.get().setCoordinatorOnlyDistribution();
return context.defaultRewrite(node, context.get());
}
@Override
public PlanNode visitTableDelete(TableDeleteNode node, RewriteContext context)
{
context.get().setCoordinatorOnlyDistribution();
return context.defaultRewrite(node, context.get());
}
@Override
public PlanNode visitTableUpdate(TableUpdateNode node, RewriteContext context)
{
context.get().setCoordinatorOnlyDistribution();
return context.defaultRewrite(node, context.get());
}
@Override
public PlanNode visitTableScan(TableScanNode node, RewriteContext context)
{
PartitioningHandle partitioning = metadata.getTableProperties(session, node.getTable())
.getTablePartitioning()
.filter(value -> node.isUseConnectorNodePartitioning())
.map(TablePartitioning::getPartitioningHandle)
.orElse(SOURCE_DISTRIBUTION);
context.get().addSourceDistribution(node.getId(), partitioning, metadata, session);
return context.defaultRewrite(node, context.get());
}
@Override
public PlanNode visitRefreshMaterializedView(RefreshMaterializedViewNode node, RewriteContext context)
{
context.get().setCoordinatorOnlyDistribution();
return context.defaultRewrite(node, context.get());
}
@Override
public PlanNode visitTableWriter(TableWriterNode node, RewriteContext context)
{
node.getPartitioningScheme().ifPresent(scheme -> context.get().setDistribution(
scheme.getPartitioning().getHandle(),
scheme.getPartitionCount(),
metadata,
session));
return context.defaultRewrite(node, context.get());
}
@Override
public PlanNode visitTableExecute(TableExecuteNode node, RewriteContext context)
{
node.getPartitioningScheme().ifPresent(scheme -> context.get().setDistribution(
scheme.getPartitioning().getHandle(),
scheme.getPartitionCount(),
metadata,
session));
return context.defaultRewrite(node, context.get());
}
@Override
public PlanNode visitMergeWriter(MergeWriterNode node, RewriteContext context)
{
node.getPartitioningScheme().ifPresent(scheme -> context.get().setDistribution(
scheme.getPartitioning().getHandle(),
scheme.getPartitionCount(),
metadata,
session));
return context.defaultRewrite(node, context.get());
}
@Override
public PlanNode visitValues(ValuesNode node, RewriteContext context)
{
// An empty values node is compatible with any distribution, so
// don't attempt to overwrite one's already been chosen
if (node.getRowCount() != 0 || !context.get().hasDistribution()) {
context.get().setSingleNodeDistribution();
}
return context.defaultRewrite(node, context.get());
}
@Override
public PlanNode visitTableFunction(TableFunctionNode node, RewriteContext context)
{
throw new IllegalStateException(format("Unexpected node: TableFunctionNode (%s)", node.getName()));
}
@Override
public PlanNode visitTableFunctionProcessor(TableFunctionProcessorNode node, RewriteContext context)
{
if (node.getSource().isEmpty()) {
// context is mutable. The leaf node should set the PartitioningHandle.
context.get().addSourceDistribution(node.getId(), SOURCE_DISTRIBUTION, metadata, session);
}
return context.defaultRewrite(node, context.get());
}
@Override
public PlanNode visitExchange(ExchangeNode exchange, RewriteContext context)
{
if (exchange.getScope() != REMOTE) {
return context.defaultRewrite(exchange, context.get());
}
PartitioningScheme partitioningScheme = exchange.getPartitioningScheme();
if (exchange.getType() == ExchangeNode.Type.GATHER) {
context.get().setSingleNodeDistribution();
}
else if (exchange.getType() == ExchangeNode.Type.REPARTITION) {
context.get().setDistribution(
partitioningScheme.getPartitioning().getHandle(),
partitioningScheme.getPartitionCount(),
metadata,
session);
}
ImmutableList.Builder childrenProperties = ImmutableList.builder();
ImmutableList.Builder childrenBuilder = ImmutableList.builder();
for (int sourceIndex = 0; sourceIndex < exchange.getSources().size(); sourceIndex++) {
FragmentProperties childProperties = new FragmentProperties(partitioningScheme.translateOutputLayout(exchange.getInputs().get(sourceIndex)));
childrenProperties.add(childProperties);
childrenBuilder.add(buildSubPlan(exchange.getSources().get(sourceIndex), childProperties, context));
}
List children = childrenBuilder.build();
context.get().addChildren(children);
List childrenIds = children.stream()
.map(SubPlan::getFragment)
.map(PlanFragment::getId)
.collect(toImmutableList());
return new RemoteSourceNode(
exchange.getId(),
childrenIds,
exchange.getOutputSymbols(),
exchange.getOrderingScheme(),
exchange.getType(),
isWorkerCoordinatorBoundary(context.get(), childrenProperties.build()) ? getRetryPolicy(session) : RetryPolicy.NONE);
}
private SubPlan buildSubPlan(PlanNode node, FragmentProperties properties, RewriteContext context)
{
PlanFragmentId planFragmentId = idAllocator.getNextId();
PlanNode child = context.rewrite(node, properties);
return buildFragment(child, properties, planFragmentId);
}
private static boolean isWorkerCoordinatorBoundary(FragmentProperties fragmentProperties, List childFragmentsProperties)
{
if (!fragmentProperties.getPartitioningHandle().isCoordinatorOnly()) {
// receiver stage is not a coordinator stage
return false;
}
if (childFragmentsProperties.stream().allMatch(properties -> properties.getPartitioningHandle().isCoordinatorOnly())) {
// coordinator to coordinator exchange
return false;
}
checkArgument(
childFragmentsProperties.stream().noneMatch(properties -> properties.getPartitioningHandle().isCoordinatorOnly()),
"Plans are not expected to have a mix of coordinator only fragments and distributed fragments as siblings");
return true;
}
}
private static class FragmentProperties
{
private final List children = new ArrayList<>();
private final PartitioningScheme partitioningScheme;
private Optional partitioningHandle = Optional.empty();
private Optional partitionCount = Optional.empty();
private final Set partitionedSources = new HashSet<>();
public FragmentProperties(PartitioningScheme partitioningScheme)
{
this.partitioningScheme = partitioningScheme;
}
public List getChildren()
{
return children;
}
public boolean hasDistribution()
{
return partitioningHandle.isPresent();
}
public FragmentProperties setSingleNodeDistribution()
{
if (partitioningHandle.isPresent() && partitioningHandle.get().isSingleNode()) {
// already single node distribution
return this;
}
checkState(partitioningHandle.isEmpty(),
"Cannot overwrite partitioning with %s (currently set to %s)",
SINGLE_DISTRIBUTION,
partitioningHandle);
partitioningHandle = Optional.of(SINGLE_DISTRIBUTION);
return this;
}
public FragmentProperties setDistribution(
PartitioningHandle distribution,
Optional partitionCount,
Metadata metadata,
Session session)
{
if (partitioningHandle.isEmpty()) {
partitioningHandle = Optional.of(distribution);
this.partitionCount = partitionCount;
return this;
}
PartitioningHandle currentPartitioning = this.partitioningHandle.get();
if (currentPartitioning.equals(distribution)) {
return this;
}
// If already system SINGLE or COORDINATOR_ONLY, leave it as is (this is for single-node execution)
if (currentPartitioning.isSingleNode()) {
return this;
}
if (isCompatibleSystemPartitioning(distribution)) {
return this;
}
if (isCompatibleScaledWriterPartitioning(currentPartitioning, distribution)) {
this.partitioningHandle = Optional.of(distribution);
this.partitionCount = partitionCount;
return this;
}
if (currentPartitioning.equals(SOURCE_DISTRIBUTION)) {
this.partitioningHandle = Optional.of(distribution);
return this;
}
Optional commonPartitioning = metadata.getCommonPartitioning(session, currentPartitioning, distribution);
if (commonPartitioning.isPresent()) {
partitioningHandle = commonPartitioning;
return this;
}
throw new IllegalStateException(format(
"Cannot set distribution to %s. Already set to %s",
distribution,
this.partitioningHandle));
}
private boolean isCompatibleSystemPartitioning(PartitioningHandle distribution)
{
ConnectorPartitioningHandle currentHandle = partitioningHandle.get().getConnectorHandle();
ConnectorPartitioningHandle distributionHandle = distribution.getConnectorHandle();
if ((currentHandle instanceof SystemPartitioningHandle) &&
(distributionHandle instanceof SystemPartitioningHandle)) {
return ((SystemPartitioningHandle) currentHandle).getPartitioning() ==
((SystemPartitioningHandle) distributionHandle).getPartitioning();
}
return false;
}
private static boolean isCompatibleScaledWriterPartitioning(PartitioningHandle current, PartitioningHandle suggested)
{
if (current.equals(FIXED_HASH_DISTRIBUTION) && suggested.equals(SCALED_WRITER_HASH_DISTRIBUTION)) {
return true;
}
PartitioningHandle currentWithScaledWritersEnabled = new PartitioningHandle(
current.getCatalogHandle(),
current.getTransactionHandle(),
current.getConnectorHandle(),
true);
return currentWithScaledWritersEnabled.equals(suggested);
}
public FragmentProperties setCoordinatorOnlyDistribution()
{
if (partitioningHandle.isPresent() && partitioningHandle.get().isCoordinatorOnly()) {
// already single node distribution
return this;
}
// only system SINGLE can be upgraded to COORDINATOR_ONLY
checkState(partitioningHandle.isEmpty() || partitioningHandle.get().equals(SINGLE_DISTRIBUTION),
"Cannot overwrite partitioning with %s (currently set to %s)",
COORDINATOR_DISTRIBUTION,
partitioningHandle);
partitioningHandle = Optional.of(COORDINATOR_DISTRIBUTION);
return this;
}
public FragmentProperties addSourceDistribution(PlanNodeId source, PartitioningHandle distribution, Metadata metadata, Session session)
{
requireNonNull(source, "source is null");
requireNonNull(distribution, "distribution is null");
partitionedSources.add(source);
if (partitioningHandle.isEmpty()) {
partitioningHandle = Optional.of(distribution);
return this;
}
PartitioningHandle currentPartitioning = partitioningHandle.get();
// If already system SINGLE or COORDINATOR_ONLY, leave it as is (this is for single-node execution)
if (currentPartitioning.equals(SINGLE_DISTRIBUTION) || currentPartitioning.equals(COORDINATOR_DISTRIBUTION)) {
return this;
}
if (currentPartitioning.equals(distribution)) {
return this;
}
Optional commonPartitioning = metadata.getCommonPartitioning(session, currentPartitioning, distribution);
if (commonPartitioning.isPresent()) {
partitioningHandle = commonPartitioning;
return this;
}
throw new IllegalStateException(format("Cannot overwrite distribution with %s (currently set to %s)", distribution, currentPartitioning));
}
public FragmentProperties addChildren(List children)
{
this.children.addAll(children);
return this;
}
public PartitioningScheme getPartitioningScheme()
{
return partitioningScheme;
}
public PartitioningHandle getPartitioningHandle()
{
return partitioningHandle.get();
}
public Optional getPartitionCount()
{
return partitionCount;
}
public Set getPartitionedSources()
{
return partitionedSources;
}
}
private static final class PartitioningHandleReassigner
extends SimplePlanRewriter
{
private final PartitioningHandle fragmentPartitioningHandle;
private final Metadata metadata;
private final Session session;
public PartitioningHandleReassigner(PartitioningHandle fragmentPartitioningHandle, Metadata metadata, Session session)
{
this.fragmentPartitioningHandle = fragmentPartitioningHandle;
this.metadata = metadata;
this.session = session;
}
@Override
public PlanNode visitTableScan(TableScanNode node, RewriteContext context)
{
PartitioningHandle partitioning = metadata.getTableProperties(session, node.getTable())
.getTablePartitioning()
.filter(value -> node.isUseConnectorNodePartitioning())
.map(TablePartitioning::getPartitioningHandle)
.orElse(SOURCE_DISTRIBUTION);
if (partitioning.equals(fragmentPartitioningHandle)) {
// do nothing if the current scan node's partitioning matches the fragment's
return node;
}
TableHandle newTable = metadata.makeCompatiblePartitioning(session, node.getTable(), fragmentPartitioningHandle);
return new TableScanNode(
node.getId(),
newTable,
node.getOutputSymbols(),
node.getAssignments(),
node.getEnforcedConstraint(),
node.getStatistics(),
node.isUpdateTarget(),
// plan was already fragmented with scan node's partitioning
// and new partitioning is compatible with previous one
node.getUseConnectorNodePartitioning());
}
}
}
