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Rework fix for #5751 (Available indices are not used in some cases if ORDER BY expression is a filtered one) and also attempt to fix the special case for OR conditions partially matched to an index

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This commit is contained in:
Dmitry Yemanov 2025-01-13 21:46:22 +03:00
parent 5167c588a4
commit 91dce62553
1 changed files with 57 additions and 33 deletions
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42
src/jrd/optimizer/Retrieval.cpp
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@ -1494,8 +1494,11 @@ InversionCandidate* Retrieval::makeInversion(InversionCandidateList& inversions)
return invCandidate;
}
// Look if a match is already used by previous matches.
if (!customPlan)
{
// Look if a match is already used by previous matches
bool anyMatchAlreadyUsed = false, matchUsedByNavigation = false;
for (const auto currentMatch : currentInv->matches)
{
if (matches.exist(currentMatch))
@ -1512,28 +1515,49 @@ InversionCandidate* Retrieval::makeInversion(InversionCandidateList& inversions)
}
}
if (currentInv->boolean && matches.exist(currentInv->boolean))
if (const auto currentMatch = currentInv->boolean)
{
if (matches.exist(currentMatch))
{
anyMatchAlreadyUsed = true;
if (anyMatchAlreadyUsed && !customPlan)
if (navigationCandidate &&
navigationCandidate->matches.exist(currentMatch))
{
currentInv->used = true;
matchUsedByNavigation = true;
}
}
else if (matchUsedByNavigation)
anyMatchAlreadyUsed = false;
}
if (matchUsedByNavigation)
continue;
// If some match was already used by another index, skip this index
if (anyMatchAlreadyUsed)
{
if (!matchUsedByNavigation)
{
// Add the other matches from this index
// If a match on this index was already used by another
// index, add also the other matches from this index.
for (const auto currentMatch : currentInv->matches)
{
if (!matches.exist(currentMatch))
matches.add(currentMatch);
}
// Restart loop, because other indexes could also be excluded now.
if (const auto currentMatch = currentInv->boolean)
{
if (!matches.exist(currentMatch))
matches.add(currentMatch);
}
}
// Restart loop, because other indexes could also be excluded now
currentInv->used = true;
restartLoop = true;
break;
}
}
if (!bestCandidate)
{