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Core Calcite APIs and engine.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you 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 org.apache.calcite.plan;
import org.apache.calcite.plan.volcano.RelSubset;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.metadata.RelMetadataProvider;
import org.apache.calcite.rel.metadata.RelMetadataQuery;
import org.apache.calcite.rex.RexExecutor;
import org.apache.calcite.util.CancelFlag;
import org.apache.calcite.util.Util;
import com.google.common.collect.ImmutableList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.regex.Pattern;
import static org.apache.calcite.util.Static.RESOURCE;
/**
* Abstract base for implementations of the {@link RelOptPlanner} interface.
*/
public abstract class AbstractRelOptPlanner implements RelOptPlanner {
//~ Static fields/initializers ---------------------------------------------
/** Regular expression for integer. */
private static final Pattern INTEGER_PATTERN = Pattern.compile("[0-9]+");
//~ Instance fields --------------------------------------------------------
/**
* Maps rule description to rule, just to ensure that rules' descriptions
* are unique.
*/
private final Map mapDescToRule = new HashMap<>();
protected final RelOptCostFactory costFactory;
private MulticastRelOptListener listener;
private Pattern ruleDescExclusionFilter;
private final AtomicBoolean cancelFlag;
private final Set> classes = new HashSet<>();
private final Set traits = new HashSet<>();
/** External context. Never null. */
protected final Context context;
private RexExecutor executor;
//~ Constructors -----------------------------------------------------------
/**
* Creates an AbstractRelOptPlanner.
*/
protected AbstractRelOptPlanner(RelOptCostFactory costFactory,
Context context) {
assert costFactory != null;
this.costFactory = costFactory;
if (context == null) {
context = Contexts.empty();
}
this.context = context;
final CancelFlag cancelFlag = context.unwrap(CancelFlag.class);
this.cancelFlag = cancelFlag != null ? cancelFlag.atomicBoolean
: new AtomicBoolean();
// Add abstract RelNode classes. No RelNodes will ever be registered with
// these types, but some operands may use them.
classes.add(RelNode.class);
classes.add(RelSubset.class);
}
//~ Methods ----------------------------------------------------------------
public void clear() {}
public Context getContext() {
return context;
}
public RelOptCostFactory getCostFactory() {
return costFactory;
}
@SuppressWarnings("deprecation")
public void setCancelFlag(CancelFlag cancelFlag) {
// ignored
}
/**
* Checks to see whether cancellation has been requested, and if so, throws
* an exception.
*/
public void checkCancel() {
if (cancelFlag.get()) {
throw RESOURCE.preparationAborted().ex();
}
}
/**
* Registers a rule's description.
*
* @param rule Rule
*/
protected void mapRuleDescription(RelOptRule rule) {
// Check that there isn't a rule with the same description,
// also validating description string.
final String description = rule.toString();
assert description != null;
assert !description.contains("$")
: "Rule's description should not contain '$': "
+ description;
assert !INTEGER_PATTERN.matcher(description).matches()
: "Rule's description should not be an integer: "
+ rule.getClass().getName() + ", " + description;
RelOptRule existingRule = mapDescToRule.put(description, rule);
if (existingRule != null) {
if (existingRule == rule) {
throw new AssertionError(
"Rule should not already be registered");
} else {
// This rule has the same description as one previously
// registered, yet it is not equal. You may need to fix the
// rule's equals and hashCode methods.
throw new AssertionError("Rule's description should be unique; "
+ "existing rule=" + existingRule + "; new rule=" + rule);
}
}
}
/**
* Removes the mapping between a rule and its description.
*
* @param rule Rule
*/
protected void unmapRuleDescription(RelOptRule rule) {
String description = rule.toString();
mapDescToRule.remove(description);
}
/**
* Returns the rule with a given description
*
* @param description Description
* @return Rule with given description, or null if not found
*/
protected RelOptRule getRuleByDescription(String description) {
return mapDescToRule.get(description);
}
public void setRuleDescExclusionFilter(Pattern exclusionFilter) {
ruleDescExclusionFilter = exclusionFilter;
}
/**
* Determines whether a given rule is excluded by ruleDescExclusionFilter.
*
* @param rule rule to test
* @return true iff rule should be excluded
*/
public boolean isRuleExcluded(RelOptRule rule) {
return ruleDescExclusionFilter != null
&& ruleDescExclusionFilter.matcher(rule.toString()).matches();
}
public RelOptPlanner chooseDelegate() {
return this;
}
public void addMaterialization(RelOptMaterialization materialization) {
// ignore - this planner does not support materializations
}
public void addLattice(RelOptLattice lattice) {
// ignore - this planner does not support lattices
}
public RelOptLattice getLattice(RelOptTable table) {
// this planner does not support lattices
return null;
}
public void registerSchema(RelOptSchema schema) {
}
public long getRelMetadataTimestamp(RelNode rel) {
return 0;
}
public void setImportance(RelNode rel, double importance) {
}
public void registerClass(RelNode node) {
final Class clazz = node.getClass();
if (classes.add(clazz)) {
onNewClass(node);
}
for (RelTrait trait : node.getTraitSet()) {
if (traits.add(trait)) {
trait.register(this);
}
}
}
/** Called when a new class of {@link RelNode} is seen. */
protected void onNewClass(RelNode node) {
node.register(this);
}
public RelTraitSet emptyTraitSet() {
return RelTraitSet.createEmpty();
}
public RelOptCost getCost(RelNode rel, RelMetadataQuery mq) {
return mq.getCumulativeCost(rel);
}
@SuppressWarnings("deprecation")
public RelOptCost getCost(RelNode rel) {
final RelMetadataQuery mq = RelMetadataQuery.instance();
return getCost(rel, mq);
}
public void addListener(RelOptListener newListener) {
if (listener == null) {
listener = new MulticastRelOptListener();
}
listener.addListener(newListener);
}
public void registerMetadataProviders(List list) {
}
public boolean addRelTraitDef(RelTraitDef relTraitDef) {
return false;
}
public void clearRelTraitDefs() {}
public List getRelTraitDefs() {
return ImmutableList.of();
}
public void setExecutor(RexExecutor executor) {
this.executor = executor;
}
public RexExecutor getExecutor() {
return executor;
}
public void onCopy(RelNode rel, RelNode newRel) {
// do nothing
}
/**
* Fires a rule, taking care of tracing and listener notification.
*
* @param ruleCall description of rule call
*/
protected void fireRule(
RelOptRuleCall ruleCall) {
checkCancel();
assert ruleCall.getRule().matches(ruleCall);
if (isRuleExcluded(ruleCall.getRule())) {
LOGGER.debug("call#{}: Rule [{}] not fired due to exclusion filter",
ruleCall.id, ruleCall.getRule());
return;
}
if (LOGGER.isDebugEnabled()) {
// Leave this wrapped in a conditional to prevent unnecessarily calling Arrays.toString(...)
LOGGER.debug("call#{}: Apply rule [{}] to {}",
ruleCall.id, ruleCall.getRule(), Arrays.toString(ruleCall.rels));
}
if (listener != null) {
RelOptListener.RuleAttemptedEvent event =
new RelOptListener.RuleAttemptedEvent(
this,
ruleCall.rel(0),
ruleCall,
true);
listener.ruleAttempted(event);
}
ruleCall.getRule().onMatch(ruleCall);
if (listener != null) {
RelOptListener.RuleAttemptedEvent event =
new RelOptListener.RuleAttemptedEvent(
this,
ruleCall.rel(0),
ruleCall,
false);
listener.ruleAttempted(event);
}
}
/**
* Takes care of tracing and listener notification when a rule's
* transformation is applied.
*
* @param ruleCall description of rule call
* @param newRel result of transformation
* @param before true before registration of new rel; false after
*/
protected void notifyTransformation(
RelOptRuleCall ruleCall,
RelNode newRel,
boolean before) {
if (before && LOGGER.isDebugEnabled()) {
LOGGER.debug("call#{}: Rule {} arguments {} produced {}",
ruleCall.id, ruleCall.getRule(), Arrays.toString(ruleCall.rels), newRel);
}
if (listener != null) {
RelOptListener.RuleProductionEvent event =
new RelOptListener.RuleProductionEvent(
this,
newRel,
ruleCall,
before);
listener.ruleProductionSucceeded(event);
}
}
/**
* Takes care of tracing and listener notification when a rel is chosen as
* part of the final plan.
*
* @param rel chosen rel
*/
protected void notifyChosen(RelNode rel) {
LOGGER.debug("For final plan, using {}", rel);
if (listener != null) {
RelOptListener.RelChosenEvent event =
new RelOptListener.RelChosenEvent(
this,
rel);
listener.relChosen(event);
}
}
/**
* Takes care of tracing and listener notification when a rel equivalence is
* detected.
*
* @param rel chosen rel
*/
protected void notifyEquivalence(
RelNode rel,
Object equivalenceClass,
boolean physical) {
if (listener != null) {
RelOptListener.RelEquivalenceEvent event =
new RelOptListener.RelEquivalenceEvent(
this,
rel,
equivalenceClass,
physical);
listener.relEquivalenceFound(event);
}
}
/**
* Takes care of tracing and listener notification when a rel is discarded
*
* @param rel discarded rel
*/
protected void notifyDiscard(
RelNode rel) {
if (listener != null) {
RelOptListener.RelDiscardedEvent event =
new RelOptListener.RelDiscardedEvent(
this,
rel);
listener.relDiscarded(event);
}
}
protected MulticastRelOptListener getListener() {
return listener;
}
/** Returns sub-classes of relational expression. */
public Iterable> subClasses(
final Class clazz) {
return Util.filter(classes, clazz::isAssignableFrom);
}
}
// End AbstractRelOptPlanner.java
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