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layoutchunk.go
198 lines (177 loc) · 6.26 KB
/
layoutchunk.go
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package parquet
import (
"github.com/stdiopt/parquet/internal/encoding"
"github.com/stdiopt/parquet/internal/parquet"
)
// layoutChunk stores the ColumnChunk in parquet file.
type layoutChunk struct {
Pages []*layoutPage
ChunkHeader *parquet.ColumnChunk
}
// Convert several pages to one chunk.
func layoutPagesToChunk(pages []*layoutPage) *layoutChunk {
ln := len(pages)
var numValues int64
var totalUncompressedSize int64
var totalCompressedSize int64
maxVal := pages[0].MaxVal
minVal := pages[0].MinVal
var nullCount int64
pT := pages[0].Schema.Type
cT := pages[0].Schema.ConvertedType
logT := pages[0].Schema.LogicalType
omitStats := pages[0].Info.OmitStats
funcTable := findFuncTable(pT, cT, logT)
for i := 0; i < ln; i++ {
if pages[i].Header.DataPageHeader != nil {
numValues += int64(pages[i].Header.DataPageHeader.NumValues)
} else {
numValues += int64(pages[i].Header.DataPageHeaderV2.NumValues)
}
totalUncompressedSize += int64(pages[i].Header.UncompressedPageSize) +
int64(len(pages[i].RawData)) -
int64(pages[i].Header.CompressedPageSize)
totalCompressedSize += int64(len(pages[i].RawData))
if !omitStats {
minVal = min(funcTable, minVal, pages[i].MinVal)
maxVal = max(funcTable, maxVal, pages[i].MaxVal)
nullCount += *pages[i].NullCount
}
}
chunk := new(layoutChunk)
chunk.Pages = pages
chunk.ChunkHeader = parquet.NewColumnChunk()
metaData := parquet.NewColumnMetaData()
metaData.Type = *pages[0].Schema.Type
metaData.Encodings = append(metaData.Encodings, parquet.Encoding_RLE)
metaData.Encodings = append(metaData.Encodings, parquet.Encoding_BIT_PACKED)
metaData.Encodings = append(metaData.Encodings, parquet.Encoding_PLAIN)
// metaData.Encodings = append(metaData.Encodings, parquet.Encoding_DELTA_BINARY_PACKED)
metaData.Codec = pages[0].CompressType
metaData.NumValues = numValues
metaData.TotalCompressedSize = totalCompressedSize
metaData.TotalUncompressedSize = totalUncompressedSize
metaData.PathInSchema = pages[0].Path
metaData.Statistics = parquet.NewStatistics()
if !omitStats && maxVal != nil && minVal != nil {
tmpBufMax := encoding.WritePlain([]interface{}{maxVal}, *pT)
tmpBufMin := encoding.WritePlain([]interface{}{minVal}, *pT)
if *pT == parquet.Type_BYTE_ARRAY {
tmpBufMax = tmpBufMax[4:]
tmpBufMin = tmpBufMin[4:]
}
metaData.Statistics.Max = tmpBufMax
metaData.Statistics.Min = tmpBufMin
metaData.Statistics.MaxValue = tmpBufMax
metaData.Statistics.MinValue = tmpBufMin
}
if !omitStats {
metaData.Statistics.NullCount = &nullCount
}
chunk.ChunkHeader.MetaData = metaData
return chunk
}
// Convert several pages to one chunk with dict page first.
func layoutPagesToDictChunk(pages []*layoutPage) *layoutChunk {
if len(pages) < 2 {
return nil
}
var numValues int64
var totalUncompressedSize int64
var totalCompressedSize int64
maxVal := pages[1].MaxVal
minVal := pages[1].MinVal
var nullCount int64
pT := pages[1].Schema.Type
cT := pages[1].Schema.ConvertedType
logT := pages[1].Schema.LogicalType
omitStats := pages[0].Info.OmitStats
funcTable := findFuncTable(pT, cT, logT)
for i := 0; i < len(pages); i++ {
if pages[i].Header.DataPageHeader != nil {
numValues += int64(pages[i].Header.DataPageHeader.NumValues)
} else if pages[i].Header.DataPageHeaderV2 != nil {
numValues += int64(pages[i].Header.DataPageHeaderV2.NumValues)
}
totalUncompressedSize += int64(pages[i].Header.UncompressedPageSize) +
int64(len(pages[i].RawData)) -
int64(pages[i].Header.CompressedPageSize)
totalCompressedSize += int64(len(pages[i].RawData))
if !omitStats && i > 0 {
minVal = min(funcTable, minVal, pages[i].MinVal)
maxVal = max(funcTable, maxVal, pages[i].MaxVal)
nullCount += *pages[i].NullCount
}
}
chunk := new(layoutChunk)
chunk.Pages = pages
chunk.ChunkHeader = parquet.NewColumnChunk()
metaData := parquet.NewColumnMetaData()
metaData.Type = *pages[1].Schema.Type
metaData.Encodings = append(metaData.Encodings, parquet.Encoding_RLE)
metaData.Encodings = append(metaData.Encodings, parquet.Encoding_BIT_PACKED)
metaData.Encodings = append(metaData.Encodings, parquet.Encoding_PLAIN)
metaData.Encodings = append(metaData.Encodings, parquet.Encoding_PLAIN_DICTIONARY)
metaData.Encodings = append(metaData.Encodings, parquet.Encoding_RLE_DICTIONARY)
metaData.Codec = pages[1].CompressType
metaData.NumValues = numValues
metaData.TotalCompressedSize = totalCompressedSize
metaData.TotalUncompressedSize = totalUncompressedSize
metaData.PathInSchema = pages[1].Path
metaData.Statistics = parquet.NewStatistics()
if !omitStats && maxVal != nil && minVal != nil {
tmpBufMax := encoding.WritePlain([]interface{}{maxVal}, *pT)
tmpBufMin := encoding.WritePlain([]interface{}{minVal}, *pT)
if *pT == parquet.Type_BYTE_ARRAY {
tmpBufMax = tmpBufMax[4:]
tmpBufMin = tmpBufMin[4:]
}
metaData.Statistics.Max = tmpBufMax
metaData.Statistics.Min = tmpBufMin
metaData.Statistics.MaxValue = tmpBufMax
metaData.Statistics.MinValue = tmpBufMin
}
if !omitStats {
metaData.Statistics.NullCount = &nullCount
}
chunk.ChunkHeader.MetaData = metaData
return chunk
}
// Decode a dict chunk
/*func layoutDecodeDictChunk(chunk *layoutChunk) {
dictPage := chunk.Pages[0]
numPages := len(chunk.Pages)
for i := 1; i < numPages; i++ {
numValues := len(chunk.Pages[i].DataTable.Values)
for j := 0; j < numValues; j++ {
if chunk.Pages[i].DataTable.Values[j] != nil {
index := chunk.Pages[i].DataTable.Values[j].(int64)
chunk.Pages[i].DataTable.Values[j] = dictPage.DataTable.Values[index]
}
}
}
chunk.Pages = chunk.Pages[1:] // delete the head dict page
}*/
// Read one chunk from parquet file (Deprecated)
/*func layoutReadChunk(
thriftReader *thrift.TBufferedTransport,
schemaHandler *SchemaHandler,
chunkHeader *parquet.ColumnChunk,
) (*layoutChunk, error) {
chunk := new(layoutChunk)
chunk.ChunkHeader = chunkHeader
var readValues int64
numValues := chunkHeader.MetaData.GetNumValues()
for readValues < numValues {
page, cnt, _, err := readPage(thriftReader, schemaHandler, chunkHeader.GetMetaData())
if err != nil {
return nil, err
}
chunk.Pages = append(chunk.Pages, page)
readValues += cnt
}
if len(chunk.Pages) > 0 && chunk.Pages[0].Header.GetType() == parquet.PageType_DICTIONARY_PAGE {
layoutDecodeDictChunk(chunk)
}
return chunk, nil
}*/