Expand the aggregation pipeline with an expression compiler and new stage - #6
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DavidBadura wants to merge 3 commits into
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Expand the aggregation pipeline with an expression compiler and new stage#6DavidBadura wants to merge 3 commits into
DavidBadura wants to merge 3 commits into
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This grows aggregation from a fixed handful of stages into most of the common MongoDB pipeline. The core piece is a new ExpressionBuilder that compiles Mongo aggregation expressions to SQL over the JSONB column. Everything else builds on it.
$group now takes a multi-key _id, groups by and accumulates over arbitrary expressions, and adds $push, $addToSet and $count. $unwind gained the object form (preserveNullAndEmptyArrays, includeArrayIndex) and treats a scalar as a single-element array like Mongo. $project can rename fields and compute new ones, and $match (plus plain find()) understands $expr.
New stages: $addFields/$set, $unset, $replaceRoot/$replaceWith, $count, $sortByCount.