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chunk_builder.go
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/
chunk_builder.go
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package execute
import (
"github.com/influxdata/flux"
"github.com/influxdata/flux/array"
"github.com/influxdata/flux/arrow"
"github.com/influxdata/flux/codes"
"github.com/influxdata/flux/execute/table"
"github.com/influxdata/flux/internal/errors"
"github.com/influxdata/flux/memory"
"github.com/influxdata/flux/values"
)
type ChunkBuilder struct {
cols []flux.ColMeta
builders []array.Builder
}
func NewChunkBuilder(cols []flux.ColMeta, size int, mem memory.Allocator) *ChunkBuilder {
builders := make([]array.Builder, len(cols))
for i, col := range cols {
b := arrow.NewBuilder(col.Type, mem)
b.Resize(size)
builders[i] = b
}
return &ChunkBuilder{cols: cols, builders: builders}
}
func (b *ChunkBuilder) AppendRecord(record values.Object) error {
for i, col := range b.cols {
v, ok := record.Get(col.Label)
if !ok {
return errors.Newf(codes.Internal, "could not find column %s in record", col.Label)
}
if err := arrow.AppendValue(b.builders[i], v); err != nil {
return err
}
}
return nil
}
func (b *ChunkBuilder) Build(key flux.GroupKey) table.Chunk {
buf := arrow.TableBuffer{
GroupKey: key,
Columns: b.cols,
}
vals := make([]array.Array, 0, len(b.builders))
for _, builder := range b.builders {
vals = append(vals, builder.NewArray())
}
buf.Values = vals
return table.ChunkFromBuffer(buf)
}