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new 7276665f1e [enhancement](Nereids) avoiding broadcast join
heuristically and pruning more in CostAndEnforceJob (#25137)
7276665f1e is described below
commit 7276665f1e4a224a87e8889f5aa84ab6329ad9d9
Author: 谢健 <[email protected]>
AuthorDate: Tue Oct 10 13:38:10 2023 +0800
[enhancement](Nereids) avoiding broadcast join heuristically and pruning
more in CostAndEnforceJob (#25137)
When the rowCount exceeds a certain threshold, refrain from generating a
broadcast join.
Only enforce the best expression in CostAndEnforce Job, rather than
enforcing every expression.
Remove lower bound group pruning
---
.../org/apache/doris/nereids/cost/CostModelV1.java | 9 -------
.../nereids/jobs/cascades/CostAndEnforcerJob.java | 31 +++++++++++++++++++---
.../nereids/properties/PhysicalProperties.java | 4 +++
.../nereids/properties/RequestPropertyDeriver.java | 8 +++++-
.../properties/RequestPropertyDeriverTest.java | 18 +++++++++++--
5 files changed, 55 insertions(+), 15 deletions(-)
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/nereids/cost/CostModelV1.java
b/fe/fe-core/src/main/java/org/apache/doris/nereids/cost/CostModelV1.java
index c802148fe0..2e19fa1fb6 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/cost/CostModelV1.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/cost/CostModelV1.java
@@ -207,15 +207,6 @@ class CostModelV1 extends PlanVisitor<Cost, PlanContext> {
// replicate
if (spec instanceof DistributionSpecReplicated) {
- double dataSize = childStatistics.computeSize();
- double memLimit =
ConnectContext.get().getSessionVariable().getMaxExecMemByte();
- //if build side is big, avoid use broadcast join
- double rowsLimit =
ConnectContext.get().getSessionVariable().getBroadcastRowCountLimit();
- double brMemlimit =
ConnectContext.get().getSessionVariable().getBroadcastHashtableMemLimitPercentage();
- if (dataSize > memLimit * brMemlimit
- || childStatistics.getRowCount() > rowsLimit) {
- return CostV1.of(Double.MAX_VALUE, Double.MAX_VALUE,
Double.MAX_VALUE);
- }
// estimate broadcast cost by an experience formula: beNumber^0.5
* rowCount
// - sender number and receiver number is not available at RBO
stage now, so we use beNumber
// - senders and receivers work in parallel, that why we use
square of beNumber
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/nereids/jobs/cascades/CostAndEnforcerJob.java
b/fe/fe-core/src/main/java/org/apache/doris/nereids/jobs/cascades/CostAndEnforcerJob.java
index dbe45d13bb..7cb73a332d 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/nereids/jobs/cascades/CostAndEnforcerJob.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/nereids/jobs/cascades/CostAndEnforcerJob.java
@@ -188,9 +188,17 @@ public class CostAndEnforcerJob extends Job implements
Cloneable {
curNodeCost,
lowestCostExpr.getCostValueByProperties(requestChildProperty),
curChildIndex);
- if (curTotalCost.getValue() > context.getCostUpperBound()) {
- curTotalCost = Cost.infinite();
- }
+
+ // Not performing lower bound group pruning here is to avoid
redundant optimization of children.
+ // For example:
+ // Group1 : betterExpr, currentExpr(child: Group2),
otherExpr(child: Group)
+ // steps
+ // 1. CostAndEnforce(currentExpr) with upperBound
betterExpr.cost
+ // 2. OptimzeGroup(Group2) with upperBound
bestExpr.cost - currentExpr.nodeCost
+ // 3. CostAndEnforce(Expr in Group2) trigger here and
exit
+ // ...
+ // n. CostAndEnforce(otherExpr) can trigger optimize
group2 again for the same requireProp
+
// the request child properties will be covered by the output
properties
// that corresponding to the request properties. so if we run
a costAndEnforceJob of the same
// group expression, that request child properties will be
different of this.
@@ -275,6 +283,23 @@ public class CostAndEnforcerJob extends Job implements
Cloneable {
}
return;
}
+
+ if (context.getRequiredProperties().isDistributionOnlyProperties()) {
+ // For properties without an orderSpec,
enforceMissingPropertiesHelper always adds a distributor
+ // above this group expression. The cost of the distributor is
equal to the cost of the groupExpression
+ // plus the cost of the distributor. The distributor remains
unchanged for different groupExpressions.
+ // Therefore, if there is a better groupExpr, it is preferable to
enforce the better groupExpr.
+ // Consequently, we can avoid this enforcement.
+ Optional<Pair<Cost, GroupExpression>> bestExpr =
groupExpression.getOwnerGroup()
+ .getLowestCostPlan(context.getRequiredProperties());
+ double bestCost = bestExpr
+ .map(costGroupExpressionPair ->
costGroupExpressionPair.first.getValue())
+ .orElse(Double.POSITIVE_INFINITY);
+ if (curTotalCost.getValue() > bestCost) {
+ return;
+ }
+ }
+
EnforceMissingPropertiesHelper enforceMissingPropertiesHelper
= new EnforceMissingPropertiesHelper(context, groupExpression,
curTotalCost);
PhysicalProperties addEnforcedProperty = enforceMissingPropertiesHelper
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/nereids/properties/PhysicalProperties.java
b/fe/fe-core/src/main/java/org/apache/doris/nereids/properties/PhysicalProperties.java
index e3b5151af7..3c89f87340 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/nereids/properties/PhysicalProperties.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/nereids/properties/PhysicalProperties.java
@@ -106,6 +106,10 @@ public class PhysicalProperties {
return distributionSpec;
}
+ public boolean isDistributionOnlyProperties() {
+ return orderSpec.getOrderKeys().isEmpty();
+ }
+
@Override
public boolean equals(Object o) {
if (this == o) {
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/nereids/properties/RequestPropertyDeriver.java
b/fe/fe-core/src/main/java/org/apache/doris/nereids/properties/RequestPropertyDeriver.java
index ec1d93ca70..acc8ef7886 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/nereids/properties/RequestPropertyDeriver.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/nereids/properties/RequestPropertyDeriver.java
@@ -165,8 +165,14 @@ public class RequestPropertyDeriver extends
PlanVisitor<Void, PlanContext> {
if (JoinUtils.couldShuffle(hashJoin)) {
addShuffleJoinRequestProperty(hashJoin);
}
+
// for broadcast join
- if (JoinUtils.couldBroadcast(hashJoin)) {
+ double memLimit =
ConnectContext.get().getSessionVariable().getMaxExecMemByte();
+ double rowsLimit =
ConnectContext.get().getSessionVariable().getBroadcastRowCountLimit();
+ double brMemlimit =
ConnectContext.get().getSessionVariable().getBroadcastHashtableMemLimitPercentage();
+ double datasize =
hashJoin.getGroupExpression().get().child(1).getStatistics().computeSize();
+ double rowCount =
hashJoin.getGroupExpression().get().child(1).getStatistics().getRowCount();
+ if (JoinUtils.couldBroadcast(hashJoin) && rowCount <= rowsLimit &&
datasize <= memLimit * brMemlimit) {
addBroadcastJoinRequestProperty();
}
return null;
diff --git
a/fe/fe-core/src/test/java/org/apache/doris/nereids/properties/RequestPropertyDeriverTest.java
b/fe/fe-core/src/test/java/org/apache/doris/nereids/properties/RequestPropertyDeriverTest.java
index 4ccee56e4b..37767273b3 100644
---
a/fe/fe-core/src/test/java/org/apache/doris/nereids/properties/RequestPropertyDeriverTest.java
+++
b/fe/fe-core/src/test/java/org/apache/doris/nereids/properties/RequestPropertyDeriverTest.java
@@ -37,6 +37,7 @@ import
org.apache.doris.nereids.trees.plans.physical.PhysicalHashJoin;
import org.apache.doris.nereids.trees.plans.physical.PhysicalNestedLoopJoin;
import org.apache.doris.nereids.types.IntegerType;
import org.apache.doris.nereids.util.ExpressionUtils;
+import org.apache.doris.qe.ConnectContext;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
@@ -60,6 +61,12 @@ class RequestPropertyDeriverTest {
@Mocked
LogicalProperties logicalProperties;
+ @Mocked
+ ConnectContext connectContext;
+
+ @Injectable
+ Group group;
+
@Injectable
JobContext jobContext;
@@ -105,7 +112,7 @@ class RequestPropertyDeriverTest {
ExpressionUtils.EMPTY_CONDITION,
ExpressionUtils.EMPTY_CONDITION, JoinHint.NONE, Optional.empty(),
logicalProperties,
groupPlan, groupPlan);
- GroupExpression groupExpression = new GroupExpression(join);
+ GroupExpression groupExpression = new GroupExpression(join,
Lists.newArrayList(group, group));
new Group(null, groupExpression, null);
RequestPropertyDeriver requestPropertyDeriver = new
RequestPropertyDeriver(jobContext);
@@ -130,11 +137,18 @@ class RequestPropertyDeriverTest {
}
};
+ new MockUp<ConnectContext>() {
+ @Mock
+ ConnectContext get() {
+ return connectContext;
+ }
+ };
+
PhysicalHashJoin<GroupPlan, GroupPlan> join = new
PhysicalHashJoin<>(JoinType.INNER_JOIN,
ExpressionUtils.EMPTY_CONDITION,
ExpressionUtils.EMPTY_CONDITION, JoinHint.NONE, Optional.empty(),
logicalProperties,
groupPlan, groupPlan);
- GroupExpression groupExpression = new GroupExpression(join);
+ GroupExpression groupExpression = new GroupExpression(join,
Lists.newArrayList(group, group));
new Group(null, groupExpression, null);
RequestPropertyDeriver requestPropertyDeriver = new
RequestPropertyDeriver(jobContext);
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