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parquet.go
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parquet.go
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package parts
import (
"fmt"
"io"
"sync/atomic"
"github.com/apache/arrow/go/v15/arrow"
"github.com/parquet-go/parquet-go"
"github.com/dreamsxin/frostdb/dynparquet"
)
// This file contains the implementation of the Part interface backed by a Parquet Buffer.
type parquetPart struct {
basePart
ref *atomic.Int32
buf *dynparquet.SerializedBuffer
}
func (p *parquetPart) Record() arrow.Record {
return nil
}
func (p *parquetPart) Retain() { p.ref.Add(1) }
func (p *parquetPart) Release() {
ref := p.ref.Add(-1)
if ref <= 0 && p.release != nil {
p.release()
}
}
func (p *parquetPart) Write(w io.Writer) error {
buf, err := p.AsSerializedBuffer(nil)
if err != nil {
return err
}
f := buf.ParquetFile()
_, err = io.Copy(w, io.NewSectionReader(f, 0, f.Size()))
return err
}
func (p *parquetPart) SerializeBuffer(_ *dynparquet.Schema, _ dynparquet.ParquetWriter) error {
return fmt.Errorf("not a record part")
}
func (p *parquetPart) AsSerializedBuffer(_ *dynparquet.Schema) (*dynparquet.SerializedBuffer, error) {
return p.buf, nil
}
func NewParquetPart(tx uint64, buf *dynparquet.SerializedBuffer, options ...Option) Part {
p := &parquetPart{
basePart: basePart{
tx: tx,
},
ref: &atomic.Int32{},
buf: buf,
}
for _, opt := range options {
opt(&p.basePart)
}
p.ref.Add(1)
return p
}
func (p *parquetPart) NumRows() int64 {
return p.buf.NumRows()
}
func (p *parquetPart) Size() int64 {
return p.buf.ParquetFile().Size()
}
// Least returns the least row in the part.
func (p *parquetPart) Least() (*dynparquet.DynamicRow, error) {
if p.minRow != nil {
return p.minRow, nil
}
minRow, err := min(p.buf)
if err != nil {
return nil, err
}
p.minRow = minRow
return p.minRow, nil
}
func (p *parquetPart) Most() (*dynparquet.DynamicRow, error) {
if p.maxRow != nil {
return p.maxRow, nil
}
maxRow, err := max(p.buf)
if err != nil {
return nil, err
}
p.maxRow = maxRow
return p.maxRow, nil
}
func (p *parquetPart) OverlapsWith(schema *dynparquet.Schema, otherPart Part) (bool, error) {
a, err := p.Least()
if err != nil {
return false, err
}
b, err := p.Most()
if err != nil {
return false, err
}
c, err := otherPart.Least()
if err != nil {
return false, err
}
d, err := otherPart.Most()
if err != nil {
return false, err
}
return schema.Cmp(a, d) <= 0 && schema.Cmp(c, b) <= 0, nil
}
func max(buf *dynparquet.SerializedBuffer) (*dynparquet.DynamicRow, error) {
rowBuf := &dynparquet.DynamicRows{Rows: make([]parquet.Row, 1)}
rg := buf.DynamicRowGroup(buf.NumRowGroups() - 1)
reader := rg.DynamicRows()
defer reader.Close()
if err := reader.SeekToRow(rg.NumRows() - 1); err != nil {
return nil, fmt.Errorf("seek to last row of part: %w", err)
}
if n, err := reader.ReadRows(rowBuf); err != nil {
return nil, fmt.Errorf("read last row of part: %w", err)
} else if n != 1 {
return nil, fmt.Errorf("expected to read exactly 1 row, but read %d", n)
}
// Copy here so that this reference does not prevent the decompressed page
// from being GCed.
return rowBuf.GetCopy(0), nil
}
func min(buf *dynparquet.SerializedBuffer) (*dynparquet.DynamicRow, error) {
rowBuf := &dynparquet.DynamicRows{Rows: make([]parquet.Row, 1)}
reader := buf.DynamicRowGroup(0).DynamicRows()
defer reader.Close()
if n, err := reader.ReadRows(rowBuf); err != nil {
return nil, fmt.Errorf("read first row of part: %w", err)
} else if n != 1 {
return nil, fmt.Errorf("expected to read exactly 1 row, but read %d", n)
}
// Copy here so that this reference does not prevent the decompressed page
// from being GCed.
return rowBuf.GetCopy(0), nil
}