DATAMONGO-861 - Add support for $cond and $ifNull operators in aggregation operations. #385
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Prepare issue branch.
…ation operations.
We now support $cond and $ifNull operators for projection and grouping operations. ConditionalOperator and IfNullOperators are AggregationExpressions that can be applied to transform or generate values during aggregation.
TypedAggregation<InventoryItem> agg = newAggregation(InventoryItem.class,
project().and("discount")
.transform(ConditionalOperator.newBuilder().when(Criteria.where("qty").gte(250))
.then(30)
.otherwise(20))
.and(ifNull("description", "Unspecified")).as("description")
);
corresponds to
{ "$project": { "discount": { "$cond": { "if": { "$gte": [ "$qty", 250 ] },
"then": 30, "else": 20 } },
"description": { "$ifNull": [ "$description", "Unspecified"] }
}
}
christophstrobl
force-pushed
the
issue/DATAMONGO-861
branch
from
3736b9d to
743ac49
Compare
Favor usage of List over BasicDBList. Rename ProjectionOperation.transform to applyCondition. Add missing author and since tags, remove trailing white spaces and fix reference documentation headline clash.
christophstrobl
force-pushed
the
issue/DATAMONGO-861
branch
from
743ac49 to
8d239c1
Compare
christophstrobl
pushed a commit
that referenced
this pull request
Aug 30, 2016
…ation operations.
We now support $cond and $ifNull operators for projection and grouping operations. ConditionalOperator and IfNullOperators are AggregationExpressions that can be applied to transform or generate values during aggregation.
TypedAggregation<InventoryItem> agg = newAggregation(InventoryItem.class,
project().and("discount")
.transform(ConditionalOperator.newBuilder().when(Criteria.where("qty").gte(250))
.then(30)
.otherwise(20))
.and(ifNull("description", "Unspecified")).as("description")
);
corresponds to
{ "$project": { "discount": { "$cond": { "if": { "$gte": [ "$qty", 250 ] },
"then": 30, "else": 20 } },
"description": { "$ifNull": [ "$description", "Unspecified"] }
}
}
Original Pull Request: #385
christophstrobl
added a commit
that referenced
this pull request
Aug 30, 2016
Favor usage of List over BasicDBList. Rename ProjectionOperation.transform to applyCondition. Add missing author and since tags, remove trailing white spaces and fix reference documentation headline clash. Original Pull Request: #385
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
We now support
$condand$ifNulloperators for projection and grouping operations.ConditionalOperatorandIfNullOperatorareAggregationExpressionsthat can be applied to transform or generate values during aggregation.corresponds to
Related ticket: DATAMONGO-861
Open issues:
sum(AggregationExpression)toGroupOperation? That change would enable conditional counting.GroupOperationBuilderwithtransform(ConditionalOperator)?