Add isNull() to ComparisonOperators#5202
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Introduce an additive isNull() builder on ComparisonOperators and its Eq operator that renders to { $eq: [ <value>, null ] }. This lets users compare a field or expression to null without the previous workaround of passing a null-returning expression, while leaving the existing equalToValue(...) null-rejection contract unchanged.
Closes spring-projects#3473
Signed-off-by: sathish256 <17120479+sathish256@users.noreply.github.com>
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status: waiting-for-triage
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Adds an additive
isNull()builder toComparisonOperators(and itsEqoperator) so a field or expression can be compared tonullin aggregation expressions:This renders to the output requested in the issue and avoids the previous workaround of passing a
null-returning expression (equalTo(ctx -> null)). The existingequalToValue(...)contract (which rejectsnull) is left unchanged.A unit test is added in
ProjectionOperationUnitTests(// GH-3473).Closes #3473