forked from segmentio/parquet-go
/
concat.go
203 lines (170 loc) · 4.03 KB
/
concat.go
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package parquet
import (
"io"
)
func concat(schema *Schema, rowGroups []RowGroup) *concatenatedRowGroup {
c := new(concatenatedRowGroup)
c.init(schema, rowGroups)
return c
}
func (c *concatenatedRowGroup) init(schema *Schema, rowGroups []RowGroup) {
c.schema = schema
c.rowGroups = rowGroups
c.columns = make([]concatenatedColumnChunk, numLeafColumnsOf(schema))
for i := range c.columns {
c.columns[i].rowGroup = c
c.columns[i].column = i
c.columns[i].chunks = make([]ColumnChunk, len(rowGroups))
for j, rowGroup := range rowGroups {
c.columns[i].chunks[j] = rowGroup.Column(i)
}
}
}
type concatenatedRowGroup struct {
schema *Schema
rowGroups []RowGroup
columns []concatenatedColumnChunk
}
func (c *concatenatedRowGroup) NumRows() (numRows int64) {
for _, rowGroup := range c.rowGroups {
numRows += rowGroup.NumRows()
}
return numRows
}
func (c *concatenatedRowGroup) NumColumns() int { return len(c.columns) }
func (c *concatenatedRowGroup) Column(i int) ColumnChunk { return &c.columns[i] }
func (c *concatenatedRowGroup) SortingColumns() []SortingColumn { return nil }
func (c *concatenatedRowGroup) Schema() *Schema { return c.schema }
func (c *concatenatedRowGroup) Rows() Rows { return &rowGroupRowReader{rowGroup: c} }
type concatenatedColumnChunk struct {
rowGroup *concatenatedRowGroup
column int
chunks []ColumnChunk
}
func (c *concatenatedColumnChunk) Type() Type {
if len(c.chunks) != 0 {
return c.chunks[0].Type() // all chunks should be of the same type
}
return nil
}
func (c *concatenatedColumnChunk) NumValues() int64 {
n := int64(0)
for i := range c.chunks {
n += c.chunks[i].NumValues()
}
return n
}
func (c *concatenatedColumnChunk) Column() int {
return c.column
}
func (c *concatenatedColumnChunk) Pages() Pages {
return &concatenatedPages{column: c}
}
func (c *concatenatedColumnChunk) ColumnIndex() ColumnIndex {
// TODO: implement
return nil
}
func (c *concatenatedColumnChunk) OffsetIndex() OffsetIndex {
// TODO: implement
return nil
}
func (c *concatenatedColumnChunk) BloomFilter() BloomFilter {
return concatenatedBloomFilter{c}
}
type concatenatedBloomFilter struct{ *concatenatedColumnChunk }
func (f concatenatedBloomFilter) ReadAt(b []byte, off int64) (int, error) {
// TODO: add a test for this function
i := 0
for i < len(f.chunks) {
if r := f.chunks[i].BloomFilter(); r != nil {
size := r.Size()
if off < size {
break
}
off -= size
}
i++
}
if i == len(f.chunks) {
return 0, io.EOF
}
rn := int(0)
for len(b) > 0 {
if r := f.chunks[i].BloomFilter(); r != nil {
n, err := r.ReadAt(b, off)
rn += n
if err != nil {
return rn, err
}
if b = b[n:]; len(b) == 0 {
return rn, nil
}
off += int64(n)
}
i++
}
if i == len(f.chunks) {
return rn, io.EOF
}
return rn, nil
}
func (f concatenatedBloomFilter) Size() int64 {
size := int64(0)
for _, c := range f.chunks {
if b := c.BloomFilter(); b != nil {
size += b.Size()
}
}
return size
}
func (f concatenatedBloomFilter) Check(v Value) (bool, error) {
for _, c := range f.chunks {
if b := c.BloomFilter(); b != nil {
if ok, err := b.Check(v); ok || err != nil {
return ok, err
}
}
}
return false, nil
}
type concatenatedPages struct {
pages Pages
index int
column *concatenatedColumnChunk
}
func (r *concatenatedPages) ReadPage() (Page, error) {
for {
if r.pages != nil {
p, err := r.pages.ReadPage()
if err == nil || err != io.EOF {
return p, err
}
r.pages = nil
}
if r.index == len(r.column.chunks) {
return nil, io.EOF
}
r.pages = r.column.chunks[r.index].Pages()
r.index++
}
}
func (r *concatenatedPages) SeekToRow(rowIndex int64) error {
rowGroups := r.column.rowGroup.rowGroups
numRows := int64(0)
r.pages = nil
r.index = 0
for r.index < len(rowGroups) {
numRows = rowGroups[r.index].NumRows()
if rowIndex < numRows {
break
}
rowIndex -= numRows
r.index++
}
if r.index < len(rowGroups) {
r.pages = r.column.chunks[r.index].Pages()
r.index++
return r.pages.SeekToRow(rowIndex)
}
return nil
}