groupby

package

v0.32.0 Latest Latest Go to latest Published: Nov 3, 2021 License: BSD-3-Clause Imports: 12 Imported by: 0

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Valid go.mod file
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Repository

github.com/brimdata/zed

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Documentation ¶

Index ¶

Variables
type Aggregator
- func NewAggregator(ctx context.Context, zctx *zed.Context, ...) (*Aggregator, error)
- func (a *Aggregator) Consume(r *zed.Value) error
- func (a *Aggregator) Results(eof bool) (zbuf.Batch, error)
type Proc
- func New(pctx *proc.Context, parent proc.Interface, keys []expr.Assignment, ...) (*Proc, error)
- func (p *Proc) Done()
- func (p *Proc) Pull() (zbuf.Batch, error)
type Row

Constants ¶

This section is empty.

Variables ¶

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var DefaultLimit = 1000000

Functions ¶

This section is empty.

Types ¶

type Aggregator ¶

type Aggregator struct {
	// contains filtered or unexported fields
}

Aggregator performs the core aggregation computation for a list of reducer generators. It handles both regular and time-binned ("every") group-by operations. Records are generated in a deterministic but undefined total order.

func NewAggregator ¶

func NewAggregator(ctx context.Context, zctx *zed.Context, keyRefs, keyExprs, aggRefs []expr.Evaluator, aggs []*expr.Aggregator, builder *zed.ColumnBuilder, limit int, inputDir order.Direction, partialsIn, partialsOut bool) (*Aggregator, error)

func (*Aggregator) Consume ¶

func (a *Aggregator) Consume(r *zed.Value) error

Consume adds a record to the aggregation.

func (*Aggregator) Results ¶

func (a *Aggregator) Results(eof bool) (zbuf.Batch, error)

Results returns a batch of aggregation result records. Upon eof, this should be called repeatedly until a nil batch is returned. If the input is sorted in the primary key, Results can be called before eof, and keys that are completed will returned.

type Proc ¶

type Proc struct {
	// contains filtered or unexported fields
}

Proc computes aggregations using an Aggregator.

func New ¶

func New(pctx *proc.Context, parent proc.Interface, keys []expr.Assignment, aggNames field.List, aggs []*expr.Aggregator, limit int, inputSortDir order.Direction, partialsIn, partialsOut bool) (*Proc, error)

func (*Proc) Done ¶

func (p *Proc) Done()

func (*Proc) Pull ¶

func (p *Proc) Pull() (zbuf.Batch, error)

type Row ¶

type Row struct {
	// contains filtered or unexported fields
}

Source Files ¶

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