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Implement pushdown for aggregate for PostgreSQL #3607

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merged 10 commits into from
Oct 23, 2023
+48 −18
Merged

Implement pushdown for aggregate for PostgreSQL #3607

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wip
noisersup Oct 18, 2023
44e5645
wip
noisersup Oct 18, 2023
ff6e7e2
wip
noisersup Oct 18, 2023
8ed8da7
Merge remote-tracking branch 'upstream/main' into aggregation-pushdow…
noisersup Oct 18, 2023
b34bf88
wip
noisersup Oct 19, 2023
100e9c3
Merge remote-tracking branch 'upstream/main' into aggregation-pushdow…
noisersup Oct 19, 2023
883975c
wip
noisersup Oct 19, 2023
5f2f64a
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noisersup Oct 20, 2023
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noisersup Oct 20, 2023
8a4dd60
Merge branch 'main' into aggregation-pushdown-sqlite-3520
AlekSi Oct 23, 2023
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@noisersup
noisersup committed Oct 18, 2023
commit 44e5645eba1065820d514a0a22ea5bd8f1b5d348
20 changes: 16 additions & 4 deletions internal/handlers/sqlite/msg_aggregate.go
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Original file line number Diff line number Diff line change
Expand Up @@ -259,9 +259,20 @@ func (h *Handler) MsgAggregate(ctx context.Context, msg *wire.OpMsg) (*wire.OpMs
var iter iterator.Interface[struct{}, *types.Document]

if len(collStatsDocuments) == len(stagesDocuments) {
// TODO https://github.com/FerretDB/FerretDB/issues/3235
// TODO https://github.com/FerretDB/FerretDB/issues/3181
iter, err = processStagesDocuments(ctx, closer, &stagesDocumentsParams{c, stagesDocuments})
filter, _ := aggregations.GetPushdownQuery(aggregationStages)

// only documents stages or no stages - fetch documents from the DB and apply stages to them
qp := new(backends.QueryParams)

if !h.DisableFilterPushdown {
qp.Filter = filter
}

//if h.EnableSortPushdown {
// qp.Sort = sort
//}

iter, err = processStagesDocuments(ctx, closer, &stagesDocumentsParams{c, qp, stagesDocuments})
} else {
// TODO https://github.com/FerretDB/FerretDB/issues/2423
statistics := stages.GetStatistics(collStatsDocuments)
Expand Down Expand Up @@ -323,12 +334,13 @@ func (h *Handler) MsgAggregate(ctx context.Context, msg *wire.OpMsg) (*wire.OpMs
// stagesDocumentsParams contains the parameters for processStagesDocuments.
type stagesDocumentsParams struct {
c backends.Collection
qp *backends.QueryParams
stages []aggregations.Stage
}

// processStagesDocuments retrieves the documents from the database and then processes them through the stages.
func processStagesDocuments(ctx context.Context, closer *iterator.MultiCloser, p *stagesDocumentsParams) (types.DocumentsIterator, error) { //nolint:lll // for readability
queryRes, err := p.c.Query(ctx, nil)
queryRes, err := p.c.Query(ctx, p.qp)
if err != nil {
closer.Close()
return nil, lazyerrors.Error(err)
Expand Down
10 changes: 8 additions & 2 deletions internal/handlers/sqlite/msg_explain.go
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Expand Up @@ -22,6 +22,7 @@
"github.com/FerretDB/FerretDB/build/version"
"github.com/FerretDB/FerretDB/internal/backends"
"github.com/FerretDB/FerretDB/internal/handlers/common"
"github.com/FerretDB/FerretDB/internal/handlers/common/aggregations"
"github.com/FerretDB/FerretDB/internal/handlers/commonerrors"
"github.com/FerretDB/FerretDB/internal/types"
"github.com/FerretDB/FerretDB/internal/util/lazyerrors"
Expand Down Expand Up @@ -79,8 +80,13 @@
}

var qp backends.ExplainParams
if !h.DisableFilterPushdown {
qp.Filter = params.Filter

if params.Aggregate {
qp.Filter, _ = aggregations.GetPushdownQuery(params.StagesDocs)
}

if h.DisableFilterPushdown {
qp.Filter = nil

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}

// Skip sorting if there are more than one sort parameters
Expand Down
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