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Diffstat (limited to 'src/mongo/db/pipeline/expression.h')
-rw-r--r-- | src/mongo/db/pipeline/expression.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/mongo/db/pipeline/expression.h b/src/mongo/db/pipeline/expression.h index 02f7858745b..f1daa29afe9 100644 --- a/src/mongo/db/pipeline/expression.h +++ b/src/mongo/db/pipeline/expression.h @@ -2025,7 +2025,10 @@ public: } bool isCommutative() const final { - return true; + // Only commutative when performing binary string comparison. The first value entered when + // multiple collation-equal but binary-unequal values are added will dictate what is stored + // in the set. + return getExpressionContext()->getCollator() == nullptr; } void acceptVisitor(ExpressionVisitor* visitor) final { |