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Accumulate unknowns into a set to avoid intermediate duplication. #864

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Merged
copybara-service merged 1 commit into from
Nov 12, 2025
Merged

Accumulate unknowns into a set to avoid intermediate duplication. #864

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24 changes: 13 additions & 11 deletions 24 runtime/src/main/java/dev/cel/runtime/AccumulatedUnknowns.java
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,8 @@
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.HashSet;
import java.util.Set;

/**
* An internal representation used for fast accumulation of unknown expr IDs and attributes. For
Expand All @@ -27,14 +28,14 @@
*/
final class AccumulatedUnknowns {
private static final int MAX_UNKNOWN_ATTRIBUTE_SIZE = 500_000;
private final List<Long> exprIds;
private final List<CelAttribute> attributes;
private final Set<Long> exprIds;
private final Set<CelAttribute> attributes;

List<Long> exprIds() {
Set<Long> exprIds() {
return exprIds;
}

List<CelAttribute> attributes() {
Set<CelAttribute> attributes() {
return attributes;
}

Expand All @@ -55,19 +56,20 @@ static AccumulatedUnknowns create(Collection<Long> ids) {
}

static AccumulatedUnknowns create(Collection<Long> exprIds, Collection<CelAttribute> attributes) {
return new AccumulatedUnknowns(new ArrayList<>(exprIds), new ArrayList<>(attributes));
return new AccumulatedUnknowns(new HashSet<>(exprIds), new HashSet<>(attributes));
}

private static void enforceMaxAttributeSize(
List<CelAttribute> lhsAttributes, List<CelAttribute> rhsAttributes) {
int totalSize = lhsAttributes.size() + rhsAttributes.size();
if (totalSize > MAX_UNKNOWN_ATTRIBUTE_SIZE) {
Set<CelAttribute> lhsAttributes, Set<CelAttribute> rhsAttributes) {
if (lhsAttributes.size() + rhsAttributes.size() > MAX_UNKNOWN_ATTRIBUTE_SIZE) {
throw new IllegalArgumentException(
"Exceeded maximum allowed unknown attributes: " + totalSize);
String.format(
"Exceeded maximum allowed unknown attributes when merging: %s, %s",
lhsAttributes.size(), rhsAttributes.size()));
}
}

private AccumulatedUnknowns(List<Long> exprIds, List<CelAttribute> attributes) {
private AccumulatedUnknowns(Set<Long> exprIds, Set<CelAttribute> attributes) {
this.exprIds = exprIds;
this.attributes = attributes;
}
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