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Java: Allow 2-column join on delta to improve join-order.

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This commit is contained in:
Anders Schack-Mulligen
2025-07-18 11:45:45 +02:00
parent ededa3c006
commit 12732525b5
1 changed files with 13 additions and 5 deletions
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18
java/ql/lib/semmle/code/java/Generics.qll
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@@ -521,7 +521,13 @@ private predicate unificationTargets(RefType t1, Type t2) {
t2 = a2.getComponentType()
)
or
exists(ParameterizedType pt1, ParameterizedType pt2, int pos |
unificationTargetsParameterized(_, _, t1, t2)
}
private predicate unificationTargetsParameterized(
ParameterizedType pt1, ParameterizedType pt2, RefType t1, RefType t2
) {
exists(int pos |
unificationTargets(pt1, pt2) and
t1 = pt1.getTypeArgument(pos) and
t2 = pt2.getTypeArgument(pos)
@@ -565,10 +571,12 @@ private predicate hasParameterSubstitution(
GenericType g1, ParameterizedType pt1, GenericType g2, ParameterizedType pt2, TypeVariable v,
RefType subst
) {
unificationTargets(pt1, pt2) and
exists(int pos | hasSubstitution(pt1.getTypeArgument(pos), pt2.getTypeArgument(pos), v, subst)) and
g1 = pt1.getGenericType() and
g2 = pt2.getGenericType()
exists(RefType t1, RefType t2 |
unificationTargetsParameterized(pt1, pt2, t1, t2) and
hasSubstitution(t1, t2, v, subst) and
g1 = pt1.getGenericType() and
g2 = pt2.getGenericType()
)
}
/**