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| author | David Percy <david.percy@mongodb.com> | 2021-11-19 22:46:15 +0000 |
|---|---|---|
| committer | Evergreen Agent <no-reply@evergreen.mongodb.com> | 2021-11-22 22:57:25 +0000 |
| commit | a39a201c7c6991132494187f25e34151db1ef5c7 (patch) | |
| tree | bc145e0a8540522a2fb42275497ab0a467e83cce /src/mongo/db/pipeline/document_source_densify.h | |
| parent | a0ca381d51c085a0ba3299b2086ae7663cc29f45 (diff) | |
| download | mongo-a39a201c7c6991132494187f25e34151db1ef5c7.tar.gz | |
SERVER-61548 Handle dotted partitionByFields in $densify
Diffstat (limited to 'src/mongo/db/pipeline/document_source_densify.h')
| -rw-r--r-- | src/mongo/db/pipeline/document_source_densify.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/mongo/db/pipeline/document_source_densify.h b/src/mongo/db/pipeline/document_source_densify.h index b4e6ff16a37..24c44b52922 100644 --- a/src/mongo/db/pipeline/document_source_densify.h +++ b/src/mongo/db/pipeline/document_source_densify.h @@ -542,7 +542,11 @@ private: boost::optional<DensifyValue> _globalMin = boost::none; boost::optional<DensifyValue> _globalMax = boost::none; - // Expression to be used to compare partitions. + // _partitionExpr has two purposes: + // 1. to determine which partition a document belongs in. + // 2. to initialize new documents with the right partition key. + // For example, if the stage had 'partitionByFields: ["a", "x.y"]' then this expression + // would be {a: "$a", {x: {y: "$x.y"}}}. boost::intrusive_ptr<ExpressionObject> _partitionExpr; bool _eof = false; |