/*
* 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.sql.planner.optimizations;
import com.facebook.presto.Session;
import com.facebook.presto.metadata.Metadata;
import com.facebook.presto.metadata.TableLayout;
import com.facebook.presto.metadata.TableLayout.NodePartitioning;
import com.facebook.presto.spi.ColumnHandle;
import com.facebook.presto.spi.ConstantProperty;
import com.facebook.presto.spi.GroupingProperty;
import com.facebook.presto.spi.LocalProperty;
import com.facebook.presto.spi.SortingProperty;
import com.facebook.presto.spi.predicate.NullableValue;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.sql.parser.SqlParser;
import com.facebook.presto.sql.planner.DomainTranslator;
import com.facebook.presto.sql.planner.ExpressionInterpreter;
import com.facebook.presto.sql.planner.NoOpSymbolResolver;
import com.facebook.presto.sql.planner.Symbol;
import com.facebook.presto.sql.planner.optimizations.ActualProperties.Global;
import com.facebook.presto.sql.planner.plan.AggregationNode;
import com.facebook.presto.sql.planner.plan.ApplyNode;
import com.facebook.presto.sql.planner.plan.AssignUniqueId;
import com.facebook.presto.sql.planner.plan.DeleteNode;
import com.facebook.presto.sql.planner.plan.DistinctLimitNode;
import com.facebook.presto.sql.planner.plan.EnforceSingleRowNode;
import com.facebook.presto.sql.planner.plan.ExchangeNode;
import com.facebook.presto.sql.planner.plan.ExplainAnalyzeNode;
import com.facebook.presto.sql.planner.plan.FilterNode;
import com.facebook.presto.sql.planner.plan.GroupIdNode;
import com.facebook.presto.sql.planner.plan.IndexJoinNode;
import com.facebook.presto.sql.planner.plan.IndexSourceNode;
import com.facebook.presto.sql.planner.plan.JoinNode;
import com.facebook.presto.sql.planner.plan.LimitNode;
import com.facebook.presto.sql.planner.plan.MarkDistinctNode;
import com.facebook.presto.sql.planner.plan.OutputNode;
import com.facebook.presto.sql.planner.plan.PlanNode;
import com.facebook.presto.sql.planner.plan.PlanVisitor;
import com.facebook.presto.sql.planner.plan.ProjectNode;
import com.facebook.presto.sql.planner.plan.RowNumberNode;
import com.facebook.presto.sql.planner.plan.SampleNode;
import com.facebook.presto.sql.planner.plan.SemiJoinNode;
import com.facebook.presto.sql.planner.plan.SortNode;
import com.facebook.presto.sql.planner.plan.TableFinishNode;
import com.facebook.presto.sql.planner.plan.TableScanNode;
import com.facebook.presto.sql.planner.plan.TableWriterNode;
import com.facebook.presto.sql.planner.plan.TopNNode;
import com.facebook.presto.sql.planner.plan.TopNRowNumberNode;
import com.facebook.presto.sql.planner.plan.UnnestNode;
import com.facebook.presto.sql.planner.plan.ValuesNode;
import com.facebook.presto.sql.planner.plan.WindowNode;
import com.facebook.presto.sql.tree.Expression;
import com.facebook.presto.sql.tree.SymbolReference;
import com.facebook.presto.util.maps.IdentityLinkedHashMap;
import com.google.common.collect.ImmutableBiMap;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Sets;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
import static com.facebook.presto.SystemSessionProperties.planWithTableNodePartitioning;
import static com.facebook.presto.spi.predicate.TupleDomain.extractFixedValues;
import static com.facebook.presto.sql.analyzer.ExpressionAnalyzer.getExpressionTypes;
import static com.facebook.presto.sql.planner.optimizations.ActualProperties.Global.arbitraryPartition;
import static com.facebook.presto.sql.planner.optimizations.ActualProperties.Global.coordinatorSingleStreamPartition;
import static com.facebook.presto.sql.planner.optimizations.ActualProperties.Global.partitionedOn;
import static com.facebook.presto.sql.planner.optimizations.ActualProperties.Global.singleStreamPartition;
import static com.facebook.presto.sql.planner.optimizations.ActualProperties.Global.streamPartitionedOn;
import static com.facebook.presto.sql.planner.plan.ExchangeNode.Scope.LOCAL;
import static com.facebook.presto.sql.planner.plan.ExchangeNode.Scope.REMOTE;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.base.Verify.verify;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static com.google.common.collect.ImmutableSet.toImmutableSet;
import static java.util.Collections.emptyList;
import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.toMap;
class PropertyDerivations
{
private PropertyDerivations() {}
public static ActualProperties deriveProperties(PlanNode node, ActualProperties inputProperties, Metadata metadata, Session session, Map<Symbol, Type> types, SqlParser parser)
{
return deriveProperties(node, ImmutableList.of(inputProperties), metadata, session, types, parser);
}
public static ActualProperties deriveProperties(PlanNode node, List<ActualProperties> inputProperties, Metadata metadata, Session session, Map<Symbol, Type> types, SqlParser parser)
{
ActualProperties output = node.accept(new Visitor(metadata, session, types, parser), inputProperties);
output.getNodePartitioning().ifPresent(partitioning ->
verify(node.getOutputSymbols().containsAll(partitioning.getColumns()), "Node-level partitioning properties contain columns not present in node's output"));
verify(node.getOutputSymbols().containsAll(output.getConstants().keySet()), "Node-level constant properties contain columns not present in node's output");
Set<Symbol> localPropertyColumns = output.getLocalProperties().stream()
.flatMap(property -> property.getColumns().stream())
.collect(Collectors.toSet());
verify(node.getOutputSymbols().containsAll(localPropertyColumns), "Node-level local properties contain columns not present in node's output");
// TODO: ideally this logic would be somehow moved to PlanSanityChecker
verify(node instanceof SemiJoinNode || inputProperties.stream().noneMatch(ActualProperties::isNullsReplicated) || output.isNullsReplicated(),
"SemiJoinNode is the only node that can strip null replication");
return output;
}
public static ActualProperties streamBackdoorDeriveProperties(PlanNode node, List<ActualProperties> inputProperties, Metadata metadata, Session session, Map<Symbol, Type> types, SqlParser parser)
{
return node.accept(new Visitor(metadata, session, types, parser), inputProperties);
}
private static class Visitor
extends PlanVisitor<List<ActualProperties>, ActualProperties>
{
private final Metadata metadata;
private final Session session;
private final Map<Symbol, Type> types;
private final SqlParser parser;
public Visitor(Metadata metadata, Session session, Map<Symbol, Type> types, SqlParser parser)
{
this.metadata = metadata;
this.session = session;
this.types = types;
this.parser = parser;
}
@Override
protected ActualProperties visitPlan(PlanNode node, List<ActualProperties> inputProperties)
{
throw new UnsupportedOperationException("not yet implemented: " + node.getClass().getName());
}
@Override
public ActualProperties visitExplainAnalyze(ExplainAnalyzeNode node, List<ActualProperties> inputProperties)
{
return ActualProperties.builder()
.global(coordinatorSingleStreamPartition())
.build();
}
@Override
public ActualProperties visitOutput(OutputNode node, List<ActualProperties> inputProperties)
{
return Iterables.getOnlyElement(inputProperties)
.translate(column -> PropertyDerivations.filterIfMissing(node.getOutputSymbols(), column));
}
@Override
public ActualProperties visitEnforceSingleRow(EnforceSingleRowNode node, List<ActualProperties> inputProperties)
{
return Iterables.getOnlyElement(inputProperties);
}
@Override
public ActualProperties visitAssignUniqueId(AssignUniqueId node, List<ActualProperties> inputProperties)
{
return Iterables.getOnlyElement(inputProperties);
}
@Override
public ActualProperties visitApply(ApplyNode node, List<ActualProperties> inputProperties)
{
return inputProperties.get(0); // apply node input (outer query)
}
@Override
public ActualProperties visitMarkDistinct(MarkDistinctNode node, List<ActualProperties> inputProperties)
{
return Iterables.getOnlyElement(inputProperties);
}
@Override
public ActualProperties visitWindow(WindowNode node, List<ActualProperties> inputProperties)
{
ActualProperties properties = Iterables.getOnlyElement(inputProperties);
// If the input is completely pre-partitioned and sorted, then the original input properties will be respected
if (ImmutableSet.copyOf(node.getPartitionBy()).equals(node.getPrePartitionedInputs()) && node.getPreSortedOrderPrefix() == node.getOrderBy().size()) {
return properties;
}
ImmutableList.Builder<LocalProperty<Symbol>> localProperties = ImmutableList.builder();
// If the WindowNode has pre-partitioned inputs, then it will not change the order of those inputs at output,
// so we should just propagate those underlying local properties that guarantee the pre-partitioning.
// TODO: come up with a more general form of this operation for other streaming operators
if (!node.getPrePartitionedInputs().isEmpty()) {
GroupingProperty<Symbol> prePartitionedProperty = new GroupingProperty<>(node.getPrePartitionedInputs());
for (LocalProperty<Symbol> localProperty : properties.getLocalProperties()) {
if (!prePartitionedProperty.isSimplifiedBy(localProperty)) {
break;
}
localProperties.add(localProperty);
}
}
if (!node.getPartitionBy().isEmpty()) {
localProperties.add(new GroupingProperty<>(node.getPartitionBy()));
}
for (Symbol column : node.getOrderBy()) {
localProperties.add(new SortingProperty<>(column, node.getOrderings().get(column)));
}
return ActualProperties.builderFrom(properties)
.local(LocalProperties.normalizeAndPrune(localProperties.build()))
.build();
}
@Override
public ActualProperties visitGroupId(GroupIdNode node, List<ActualProperties> inputProperties)
{
Map<Symbol, Symbol> inputToOutputMappings = new HashMap<>();
for (Map.Entry<Symbol, Symbol> setMapping : node.getGroupingSetMappings().entrySet()) {
if (node.getCommonGroupingColumns().contains(setMapping.getKey())) {
// TODO: Add support for translating a property on a single column to multiple columns
// when GroupIdNode is copying a single input grouping column into multiple output grouping columns (i.e. aliases), this is basically picking one arbitrarily
inputToOutputMappings.putIfAbsent(setMapping.getValue(), setMapping.getKey());
}
}
// TODO: Add support for translating a property on a single column to multiple columns
// this is deliberately placed after the grouping columns, because preserving properties has a bigger perf impact
for (Map.Entry<Symbol, Symbol> argumentMapping : node.getArgumentMappings().entrySet()) {
inputToOutputMappings.putIfAbsent(argumentMapping.getValue(), argumentMapping.getKey());
}
return Iterables.getOnlyElement(inputProperties).translate(column -> Optional.ofNullable(inputToOutputMappings.get(column)));
}
@Override
public ActualProperties visitAggregation(AggregationNode node, List<ActualProperties> inputProperties)
{
ActualProperties properties = Iterables.getOnlyElement(inputProperties);
ActualProperties translated = properties.translate(symbol -> node.getGroupingKeys().contains(symbol) ? Optional.of(symbol) : Optional.empty());
return ActualProperties.builderFrom(translated)
.local(LocalProperties.grouped(node.getGroupingKeys()))
.build();
}
@Override
public ActualProperties visitRowNumber(RowNumberNode node, List<ActualProperties> inputProperties)
{
return Iterables.getOnlyElement(inputProperties);
}
@Override
public ActualProperties visitTopNRowNumber(TopNRowNumberNode node, List<ActualProperties> inputProperties)
{
ActualProperties properties = Iterables.getOnlyElement(inputProperties);
ImmutableList.Builder<LocalProperty<Symbol>> localProperties = ImmutableList.builder();
localProperties.add(new GroupingProperty<>(node.getPartitionBy()));
for (Symbol column : node.getOrderBy()) {
localProperties.add(new SortingProperty<>(column, node.getOrderings().get(column)));
}
return ActualProperties.builderFrom(properties)
.local(localProperties.build())
.build();
}
@Override
public ActualProperties visitTopN(TopNNode node, List<ActualProperties> inputProperties)
{
ActualProperties properties = Iterables.getOnlyElement(inputProperties);
List<SortingProperty<Symbol>> localProperties = node.getOrderBy().stream()
.map(column -> new SortingProperty<>(column, node.getOrderings().get(column)))
.collect(toImmutableList());
return ActualProperties.builderFrom(properties)
.local(localProperties)
.build();
}
@Override
public ActualProperties visitSort(SortNode node, List<ActualProperties> inputProperties)
{
ActualProperties properties = Iterables.getOnlyElement(inputProperties);
List<SortingProperty<Symbol>> localProperties = node.getOrderBy().stream()
.map(column -> new SortingProperty<>(column, node.getOrderings().get(column)))
.collect(toImmutableList());
return ActualProperties.builderFrom(properties)
.local(localProperties)
.build();
}
@Override
public ActualProperties visitLimit(LimitNode node, List<ActualProperties> inputProperties)
{
return Iterables.getOnlyElement(inputProperties);
}
@Override
public ActualProperties visitDistinctLimit(DistinctLimitNode node, List<ActualProperties> inputProperties)
{
ActualProperties properties = Iterables.getOnlyElement(inputProperties);
return ActualProperties.builderFrom(properties)
.local(LocalProperties.grouped(node.getDistinctSymbols()))
.build();
}
@Override
public ActualProperties visitTableFinish(TableFinishNode node, List<ActualProperties> inputProperties)
{
return ActualProperties.builder()
.global(coordinatorSingleStreamPartition())
.build();
}
@Override
public ActualProperties visitDelete(DeleteNode node, List<ActualProperties> inputProperties)
{
// drop all symbols in property because delete doesn't pass on any of the columns
return Iterables.getOnlyElement(inputProperties).translate(symbol -> Optional.empty());
}
@Override
public ActualProperties visitJoin(JoinNode node, List<ActualProperties> inputProperties)
{
ActualProperties probeProperties = inputProperties.get(0);
ActualProperties buildProperties = inputProperties.get(1);
switch (node.getType()) {
case INNER:
probeProperties = probeProperties.translate(column -> filterOrRewrite(node.getOutputSymbols(), node.getCriteria(), column));
buildProperties = buildProperties.translate(column -> filterOrRewrite(node.getOutputSymbols(), node.getCriteria(), column));
Map<Symbol, NullableValue> constants = new HashMap<>();
constants.putAll(probeProperties.getConstants());
constants.putAll(buildProperties.getConstants());
return ActualProperties.builderFrom(probeProperties)
.constants(constants)
.build();
case LEFT:
return ActualProperties.builderFrom(probeProperties.translate(column -> filterIfMissing(node.getOutputSymbols(), column)))
.build();
case RIGHT:
buildProperties = buildProperties.translate(column -> filterIfMissing(node.getOutputSymbols(), column));
return ActualProperties.builderFrom(buildProperties.translate(column -> filterIfMissing(node.getOutputSymbols(), column)))
.local(ImmutableList.of())
.build();
case FULL:
// We can't say anything about the partitioning scheme because any partition of
// a hash-partitioned join can produce nulls in case of a lack of matches
return ActualProperties.builder()
.global(probeProperties.isSingleNode() ? singleStreamPartition() : arbitraryPartition())
.build();
default:
throw new UnsupportedOperationException("Unsupported join type: " + node.getType());
}
}
@Override
public ActualProperties visitSemiJoin(SemiJoinNode node, List<ActualProperties> inputProperties)
{
return inputProperties.get(0);
}
@Override
public ActualProperties visitIndexJoin(IndexJoinNode node, List<ActualProperties> inputProperties)
{
// TODO: include all equivalent columns in partitioning properties
ActualProperties probeProperties = inputProperties.get(0);
ActualProperties indexProperties = inputProperties.get(1);
switch (node.getType()) {
case INNER:
return ActualProperties.builderFrom(probeProperties)
.constants(ImmutableMap.<Symbol, NullableValue>builder()
.putAll(probeProperties.getConstants())
.putAll(indexProperties.getConstants())
.build())
.build();
case SOURCE_OUTER:
return ActualProperties.builderFrom(probeProperties)
.constants(probeProperties.getConstants())
.build();
default:
throw new UnsupportedOperationException("Unsupported join type: " + node.getType());
}
}
@Override
public ActualProperties visitIndexSource(IndexSourceNode node, List<ActualProperties> context)
{
return ActualProperties.builder()
.global(singleStreamPartition())
.build();
}
public static Map<Symbol, Symbol> exchangeInputToOutput(ExchangeNode node, int sourceIndex)
{
List<Symbol> inputSymbols = node.getInputs().get(sourceIndex);
Map<Symbol, Symbol> inputToOutput = new HashMap<>();
for (int i = 0; i < node.getOutputSymbols().size(); i++) {
inputToOutput.put(inputSymbols.get(i), node.getOutputSymbols().get(i));
}
return inputToOutput;
}
@Override
public ActualProperties visitExchange(ExchangeNode node, List<ActualProperties> inputProperties)
{
checkArgument(node.getScope() != REMOTE || inputProperties.stream().noneMatch(ActualProperties::isNullsReplicated), "Null replicated inputs should not be remotely exchanged");
Set<Map.Entry<Symbol, NullableValue>> entries = null;
for (int sourceIndex = 0; sourceIndex < node.getSources().size(); sourceIndex++) {
Map<Symbol, Symbol> inputToOutput = exchangeInputToOutput(node, sourceIndex);
ActualProperties translated = inputProperties.get(sourceIndex).translate(symbol -> Optional.ofNullable(inputToOutput.get(symbol)));
entries = (entries == null) ? translated.getConstants().entrySet() : Sets.intersection(entries, translated.getConstants().entrySet());
}
checkState(entries != null);
Map<Symbol, NullableValue> constants = entries.stream()
.collect(toMap(Map.Entry::getKey, Map.Entry::getValue));
// Local exchanges are only created in AddLocalExchanges, at the end of optimization, and
// local exchanges do not produce global properties as represented by ActualProperties.
// This is acceptable because AddLocalExchanges does not use global properties and is only
// interested in the local properties.
// TODO: implement full properties for local exchanges
if (node.getScope() == LOCAL) {
return ActualProperties.builder()
.constants(constants)
.build();
}
switch (node.getType()) {
case GATHER:
boolean coordinatorOnly = node.getPartitioningScheme().getPartitioning().getHandle().isCoordinatorOnly();
return ActualProperties.builder()
.global(coordinatorOnly ? coordinatorSingleStreamPartition() : singleStreamPartition())
.constants(constants)
.build();
case REPARTITION:
return ActualProperties.builder()
.global(partitionedOn(
node.getPartitioningScheme().getPartitioning(),
Optional.of(node.getPartitioningScheme().getPartitioning()))
.withReplicatedNulls(node.getPartitioningScheme().isReplicateNulls()))
.constants(constants)
.build();
case REPLICATE:
// TODO: this should have the same global properties as the stream taking the replicated data
return ActualProperties.builder()
.global(arbitraryPartition())
.constants(constants)
.build();
}
throw new UnsupportedOperationException("not yet implemented");
}
@Override
public ActualProperties visitFilter(FilterNode node, List<ActualProperties> inputProperties)
{
ActualProperties properties = Iterables.getOnlyElement(inputProperties);
DomainTranslator.ExtractionResult decomposedPredicate = DomainTranslator.fromPredicate(
metadata,
session,
node.getPredicate(),
types);
Map<Symbol, NullableValue> constants = new HashMap<>(properties.getConstants());
constants.putAll(extractFixedValues(decomposedPredicate.getTupleDomain()).orElse(ImmutableMap.of()));
return ActualProperties.builderFrom(properties)
.constants(constants)
.build();
}
@Override
public ActualProperties visitProject(ProjectNode node, List<ActualProperties> inputProperties)
{
ActualProperties properties = Iterables.getOnlyElement(inputProperties);
Map<Symbol, Symbol> identities = computeIdentityTranslations(node.getAssignments().getMap());
ActualProperties translatedProperties = properties.translate(column -> Optional.ofNullable(identities.get(column)));
// Extract additional constants
Map<Symbol, NullableValue> constants = new HashMap<>();
for (Map.Entry<Symbol, Expression> assignment : node.getAssignments().entrySet()) {
Expression expression = assignment.getValue();
IdentityLinkedHashMap<Expression, Type> expressionTypes = getExpressionTypes(session, metadata, parser, types, expression, emptyList() /* parameters already replaced */);
Type type = requireNonNull(expressionTypes.get(expression));
ExpressionInterpreter optimizer = ExpressionInterpreter.expressionOptimizer(expression, metadata, session, expressionTypes);
// TODO:
// We want to use a symbol resolver that looks up in the constants from the input subplan
// to take advantage of constant-folding for complex expressions
// However, that currently causes errors when those expressions operate on arrays or row types
// ("ROW comparison not supported for fields with null elements", etc)
Object value = optimizer.optimize(NoOpSymbolResolver.INSTANCE);
if (value instanceof SymbolReference) {
Symbol symbol = Symbol.from((SymbolReference) value);
NullableValue existingConstantValue = constants.get(symbol);
if (existingConstantValue != null) {
constants.put(assignment.getKey(), new NullableValue(type, value));
}
}
else if (!(value instanceof Expression)) {
constants.put(assignment.getKey(), new NullableValue(type, value));
}
}
constants.putAll(translatedProperties.getConstants());
return ActualProperties.builderFrom(translatedProperties)
.constants(constants)
.build();
}
@Override
public ActualProperties visitTableWriter(TableWriterNode node, List<ActualProperties> inputProperties)
{
ActualProperties properties = Iterables.getOnlyElement(inputProperties);
if (properties.isCoordinatorOnly()) {
return ActualProperties.builder()
.global(coordinatorSingleStreamPartition())
.build();
}
return ActualProperties.builder()
.global(properties.isSingleNode() ? singleStreamPartition() : arbitraryPartition())
.build();
}
@Override
public ActualProperties visitSample(SampleNode node, List<ActualProperties> inputProperties)
{
return Iterables.getOnlyElement(inputProperties);
}
@Override
public ActualProperties visitUnnest(UnnestNode node, List<ActualProperties> inputProperties)
{
Set<Symbol> passThroughInputs = ImmutableSet.copyOf(node.getReplicateSymbols());
return Iterables.getOnlyElement(inputProperties).translate(column -> {
if (passThroughInputs.contains(column)) {
return Optional.of(column);
}
return Optional.empty();
});
}
@Override
public ActualProperties visitValues(ValuesNode node, List<ActualProperties> context)
{
return ActualProperties.builder()
.global(singleStreamPartition())
.build();
}
@Override
public ActualProperties visitTableScan(TableScanNode node, List<ActualProperties> inputProperties)
{
checkArgument(node.getLayout().isPresent(), "table layout has not yet been chosen");
TableLayout layout = metadata.getLayout(session, node.getLayout().get());
Map<ColumnHandle, Symbol> assignments = ImmutableBiMap.copyOf(node.getAssignments()).inverse();
ActualProperties.Builder properties = ActualProperties.builder();
// Globally constant assignments
Map<ColumnHandle, NullableValue> globalConstants = new HashMap<>();
extractFixedValues(node.getCurrentConstraint()).orElse(ImmutableMap.of())
.entrySet().stream()
.filter(entry -> !entry.getValue().isNull())
.forEach(entry -> globalConstants.put(entry.getKey(), entry.getValue()));
Map<Symbol, NullableValue> symbolConstants = globalConstants.entrySet().stream()
.filter(entry -> assignments.containsKey(entry.getKey()))
.collect(toMap(entry -> assignments.get(entry.getKey()), Map.Entry::getValue));
properties.constants(symbolConstants);
// Partitioning properties
properties.global(deriveGlobalProperties(layout, assignments, globalConstants));
// Append the global constants onto the local properties to maximize their translation potential
List<LocalProperty<ColumnHandle>> constantAppendedLocalProperties = ImmutableList.<LocalProperty<ColumnHandle>>builder()
.addAll(globalConstants.keySet().stream().map(column -> new ConstantProperty<>(column)).iterator())
.addAll(layout.getLocalProperties())
.build();
properties.local(LocalProperties.translate(constantAppendedLocalProperties, column -> Optional.ofNullable(assignments.get(column))));
return properties.build();
}
private Global deriveGlobalProperties(TableLayout layout, Map<ColumnHandle, Symbol> assignments, Map<ColumnHandle, NullableValue> constants)
{
Optional<List<Symbol>> partitioning = layout.getPartitioningColumns()
.flatMap(columns -> translateToNonConstantSymbols(columns, assignments, constants));
if (planWithTableNodePartitioning(session) && layout.getNodePartitioning().isPresent()) {
NodePartitioning nodePartitioning = layout.getNodePartitioning().get();
if (assignments.keySet().containsAll(nodePartitioning.getPartitioningColumns())) {
List<Symbol> arguments = nodePartitioning.getPartitioningColumns().stream()
.map(assignments::get)
.collect(toImmutableList());
return partitionedOn(nodePartitioning.getPartitioningHandle(), arguments, partitioning);
}
}
if (partitioning.isPresent()) {
return streamPartitionedOn(partitioning.get());
}
return arbitraryPartition();
}
private static Optional<List<Symbol>> translateToNonConstantSymbols(
Set<ColumnHandle> columnHandles,
Map<ColumnHandle, Symbol> assignments,
Map<ColumnHandle, NullableValue> globalConstants)
{
// Strip off the constants from the partitioning columns (since those are not required for translation)
Set<ColumnHandle> constantsStrippedColumns = columnHandles.stream()
.filter(column -> !globalConstants.containsKey(column))
.collect(toImmutableSet());
ImmutableSet.Builder<Symbol> builder = ImmutableSet.builder();
for (ColumnHandle column : constantsStrippedColumns) {
Symbol translated = assignments.get(column);
if (translated == null) {
return Optional.empty();
}
builder.add(translated);
}
return Optional.of(ImmutableList.copyOf(builder.build()));
}
private static Map<Symbol, Symbol> computeIdentityTranslations(Map<Symbol, Expression> assignments)
{
Map<Symbol, Symbol> inputToOutput = new HashMap<>();
for (Map.Entry<Symbol, Expression> assignment : assignments.entrySet()) {
if (assignment.getValue() instanceof SymbolReference) {
inputToOutput.put(Symbol.from(assignment.getValue()), assignment.getKey());
}
}
return inputToOutput;
}
}
public static Optional<Symbol> filterIfMissing(Collection<Symbol> columns, Symbol column)
{
if (columns.contains(column)) {
return Optional.of(column);
}
return Optional.empty();
}
// Used to filter columns that are not exposed by join node
// Or, if they are part of the equalities, to translate them
// to the other symbol if that's exposed, instead.
public static Optional<Symbol> filterOrRewrite(Collection<Symbol> columns, Collection<JoinNode.EquiJoinClause> equalities, Symbol column)
{
// symbol is exposed directly, so no translation needed
if (columns.contains(column)) {
return Optional.of(column);
}
// if the column is part of the equality conditions and its counterpart
// is exposed, use that, instead
for (JoinNode.EquiJoinClause equality : equalities) {
if (equality.getLeft().equals(column) && columns.contains(equality.getRight())) {
return Optional.of(equality.getRight());
}
else if (equality.getRight().equals(column) && columns.contains(equality.getLeft())) {
return Optional.of(equality.getLeft());
}
}
return Optional.empty();
}
}