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| author | Ian Boros <ian.boros@mongodb.com> | 2021-05-27 17:08:35 -0400 |
|---|---|---|
| committer | Evergreen Agent <no-reply@evergreen.mongodb.com> | 2021-06-01 17:42:46 +0000 |
| commit | 90eb445e58124ed8b6b46a048834bffe350dad4c (patch) | |
| tree | cc24fb680e254f1e4eff5946b51b7b924af8d561 /src/mongo/db/query/sbe_stage_builder_filter.cpp | |
| parent | abda02c1aa43b6ce053eb8857d1724dceee43fd2 (diff) | |
| download | mongo-90eb445e58124ed8b6b46a048834bffe350dad4c.tar.gz | |
SERVER-57225 Prevent top-level AND optimization from being used for ANDs with many children
Diffstat (limited to 'src/mongo/db/query/sbe_stage_builder_filter.cpp')
| -rw-r--r-- | src/mongo/db/query/sbe_stage_builder_filter.cpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/mongo/db/query/sbe_stage_builder_filter.cpp b/src/mongo/db/query/sbe_stage_builder_filter.cpp index 0cdccc4323a..cedb52a3f5b 100644 --- a/src/mongo/db/query/sbe_stage_builder_filter.cpp +++ b/src/mongo/db/query/sbe_stage_builder_filter.cpp @@ -80,6 +80,7 @@ namespace mongo::stage_builder { namespace { struct MatchExpressionVisitorContext; +const size_t kMaxChildrenForTopLevelAndOptimization = 25; /** * Output of the tree can come from two places: @@ -131,7 +132,8 @@ struct MatchExpressionVisitorContext { // If the root node is an $and, store it in 'topLevelAnd'. // TODO: SERVER-50673: Revisit how we implement the top-level $and optimization. - if (root->matchType() == MatchExpression::AND) { + if (root->matchType() == MatchExpression::AND && + root->numChildren() <= kMaxChildrenForTopLevelAndOptimization) { topLevelAnd = root; } } @@ -165,7 +167,8 @@ struct MatchExpressionVisitorContext { // If the root node is an $and, store it in 'topLevelAnd'. // TODO: SERVER-50673: Revisit how we implement the top-level $and optimization. - if (root->matchType() == MatchExpression::AND) { + if (root->matchType() == MatchExpression::AND && + root->numChildren() <= kMaxChildrenForTopLevelAndOptimization) { topLevelAnd = root; } } |