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Java: Improve several join-orders #20088

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Merged
merged 3 commits into from
Jul 18, 2025
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Java: Improve several join-orders #20088

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1273252
Java: Allow 2-column join on delta to improve join-order.
aschackmull Jul 18, 2025
7883124
Java: getSourceDeclaration() and getASourceSupertype*() commute and t…
aschackmull Jul 18, 2025
d9f47bd
Java: Improve join-order by properly annotating haveIntersection.
aschackmull Jul 18, 2025
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Java: Improve join-order by properly annotating haveIntersection.
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@aschackmull
aschackmull committed Jul 18, 2025
commit d9f47bdec9ec0ac568c1a447ccf42fe93ad0ccdc
11 changes: 9 additions & 2 deletions java/ql/lib/semmle/code/java/Type.qll
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Expand Up @@ -1261,14 +1261,21 @@ private Type erase(Type t) {
*
* For the definition of the notion of *erasure* see JLS v8, section 4.6 (Type Erasure).
*/
bindingset[t1, t2]
overlay[caller?]
pragma[inline]
pragma[inline_late]
predicate haveIntersection(RefType t1, RefType t2) {
exists(RefType e1, RefType e2 | e1 = erase(t1) and e2 = erase(t2) |
erasedHaveIntersection(e1, e2)
erasedHaveIntersectionFilter(e1, e2)
)
}

bindingset[t1, t2]
pragma[inline_late]
private predicate erasedHaveIntersectionFilter(RefType t1, RefType t2) {
erasedHaveIntersection(t1, t2)
}

/**
* Holds if there is no common (reflexive, transitive) subtype of the erasures
* of types `t1` and `t2`.
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