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dictpage.go
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dictpage.go
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package layout
import (
"context"
"reflect"
"github.com/apache/thrift/lib/go/thrift"
"github.com/xitongsys/parquet-go/common"
"github.com/xitongsys/parquet-go/compress"
"github.com/xitongsys/parquet-go/encoding"
"github.com/xitongsys/parquet-go/types"
"github.com/xitongsys/parquet-go/parquet"
)
type DictRecType struct {
DictMap map[interface{}]int32
DictSlice []interface{}
Type parquet.Type
}
func NewDictRec(pT parquet.Type) *DictRecType {
res := new(DictRecType)
res.DictMap = make(map[interface{}]int32)
res.Type = pT
return res
}
func DictRecToDictPage(dictRec *DictRecType, pageSize int32, compressType parquet.CompressionCodec) (*Page, int64) {
var totSize int64 = 0
page := NewDataPage()
page.PageSize = pageSize
page.Header.DataPageHeader.NumValues = int32(len(dictRec.DictSlice))
page.Header.Type = parquet.PageType_DICTIONARY_PAGE
page.DataTable = new(Table)
page.DataTable.Values = dictRec.DictSlice
page.DataType = parquet.Type_INT32
page.CompressType = compressType
page.DictPageCompress(compressType, dictRec.Type)
totSize += int64(len(page.RawData))
return page, totSize
}
//Compress the dict page to parquet file
func (page *Page) DictPageCompress(compressType parquet.CompressionCodec, pT parquet.Type) []byte {
dataBuf := encoding.WritePlain(page.DataTable.Values, pT)
var dataEncodeBuf []byte = compress.Compress(dataBuf, compressType)
//pageHeader/////////////////////////////////////
page.Header = parquet.NewPageHeader()
page.Header.Type = parquet.PageType_DICTIONARY_PAGE
page.Header.CompressedPageSize = int32(len(dataEncodeBuf))
page.Header.UncompressedPageSize = int32(len(dataBuf))
page.Header.DictionaryPageHeader = parquet.NewDictionaryPageHeader()
page.Header.DictionaryPageHeader.NumValues = int32(len(page.DataTable.Values))
page.Header.DictionaryPageHeader.Encoding = parquet.Encoding_PLAIN
ts := thrift.NewTSerializer()
ts.Protocol = thrift.NewTCompactProtocolFactory().GetProtocol(ts.Transport)
pageHeaderBuf, _ := ts.Write(context.TODO(), page.Header)
var res []byte
res = append(res, pageHeaderBuf...)
res = append(res, dataEncodeBuf...)
page.RawData = res
return res
}
//Convert a table to dict data pages
func TableToDictDataPages(dictRec *DictRecType, table *Table, pageSize int32, bitWidth int32, compressType parquet.CompressionCodec) ([]*Page, int64) {
var totSize int64 = 0
totalLn := len(table.Values)
res := make([]*Page, 0)
i := 0
dataType := table.Type
pT, cT := types.TypeNameToParquetType(table.Info.Type, table.Info.BaseType)
for i < totalLn {
j := i
var size int32 = 0
var numValues int32 = 0
var maxVal interface{} = table.Values[i]
var minVal interface{} = table.Values[i]
values := make([]interface{}, 0)
for j < totalLn && size < pageSize {
if table.DefinitionLevels[j] == table.MaxDefinitionLevel {
numValues++
size += int32(common.SizeOf(reflect.ValueOf(table.Values[j])))
maxVal = common.Max(maxVal, table.Values[j], pT, cT)
minVal = common.Min(minVal, table.Values[j], pT, cT)
if _, ok := dictRec.DictMap[table.Values[j]]; !ok {
dictRec.DictSlice = append(dictRec.DictSlice, table.Values[j])
dictRec.DictMap[table.Values[j]] = int32(len(dictRec.DictSlice) - 1)
}
values = append(values, int32(dictRec.DictMap[table.Values[j]]))
}
j++
}
page := NewDataPage()
page.PageSize = pageSize
page.Header.DataPageHeader.NumValues = numValues
page.Header.Type = parquet.PageType_DATA_PAGE
page.DataTable = new(Table)
page.DataTable.RepetitionType = table.RepetitionType
page.DataTable.Path = table.Path
page.DataTable.MaxDefinitionLevel = table.MaxDefinitionLevel
page.DataTable.MaxRepetitionLevel = table.MaxRepetitionLevel
page.DataTable.Values = values
page.DataTable.DefinitionLevels = table.DefinitionLevels[i:j]
page.DataTable.RepetitionLevels = table.RepetitionLevels[i:j]
page.MaxVal = maxVal
page.MinVal = minVal
page.DataType = dataType //check !!!
page.CompressType = compressType
page.Path = table.Path
page.Info = table.Info
page.DictDataPageCompress(compressType, bitWidth)
totSize += int64(len(page.RawData))
res = append(res, page)
i = j
}
return res, totSize
}
//Compress the data page to parquet file
func (page *Page) DictDataPageCompress(compressType parquet.CompressionCodec, bitWidth int32) []byte {
ln := len(page.DataTable.DefinitionLevels)
//values////////////////////////////////////////////
valuesRawBuf := []byte{byte(bitWidth)}
valuesRawBuf = append(valuesRawBuf, encoding.WriteRLE(page.DataTable.Values, bitWidth, parquet.Type_INT32)...)
//definitionLevel//////////////////////////////////
var definitionLevelBuf []byte
if page.DataTable.MaxDefinitionLevel > 0 {
numInterfaces := make([]interface{}, ln)
for i := 0; i < ln; i++ {
numInterfaces[i] = int64(page.DataTable.DefinitionLevels[i])
}
definitionLevelBuf = encoding.WriteRLEBitPackedHybrid(numInterfaces,
int32(common.BitNum(uint64(page.DataTable.MaxDefinitionLevel))),
parquet.Type_INT64)
}
//repetitionLevel/////////////////////////////////
var repetitionLevelBuf []byte
if page.DataTable.MaxRepetitionLevel > 0 {
numInterfaces := make([]interface{}, ln)
for i := 0; i < ln; i++ {
numInterfaces[i] = int64(page.DataTable.RepetitionLevels[i])
}
repetitionLevelBuf = encoding.WriteRLEBitPackedHybrid(numInterfaces,
int32(common.BitNum(uint64(page.DataTable.MaxRepetitionLevel))),
parquet.Type_INT64)
}
//dataBuf = repetitionBuf + definitionBuf + valuesRawBuf
var dataBuf []byte
dataBuf = append(dataBuf, repetitionLevelBuf...)
dataBuf = append(dataBuf, definitionLevelBuf...)
dataBuf = append(dataBuf, valuesRawBuf...)
var dataEncodeBuf []byte = compress.Compress(dataBuf, compressType)
//pageHeader/////////////////////////////////////
page.Header = parquet.NewPageHeader()
page.Header.Type = parquet.PageType_DATA_PAGE
page.Header.CompressedPageSize = int32(len(dataEncodeBuf))
page.Header.UncompressedPageSize = int32(len(dataBuf))
page.Header.DataPageHeader = parquet.NewDataPageHeader()
page.Header.DataPageHeader.NumValues = int32(len(page.DataTable.DefinitionLevels))
page.Header.DataPageHeader.DefinitionLevelEncoding = parquet.Encoding_RLE
page.Header.DataPageHeader.RepetitionLevelEncoding = parquet.Encoding_RLE
page.Header.DataPageHeader.Encoding = parquet.Encoding_PLAIN_DICTIONARY
ts := thrift.NewTSerializer()
ts.Protocol = thrift.NewTCompactProtocolFactory().GetProtocol(ts.Transport)
pageHeaderBuf, _ := ts.Write(context.TODO(), page.Header)
var res []byte
res = append(res, pageHeaderBuf...)
res = append(res, dataEncodeBuf...)
page.RawData = res
return res
}
//Convert a table to dict page
func TableToDictPage(table *Table, pageSize int32, compressType parquet.CompressionCodec) (*Page, int64) {
var totSize int64 = 0
totalLn := len(table.Values)
dataType := table.Type
page := NewDataPage()
page.PageSize = pageSize
page.Header.DataPageHeader.NumValues = int32(totalLn)
page.Header.Type = parquet.PageType_DICTIONARY_PAGE
page.DataTable = new(Table)
page.DataTable.RepetitionType = table.RepetitionType
page.DataTable.Path = table.Path
page.DataTable.MaxDefinitionLevel = table.MaxDefinitionLevel
page.DataTable.MaxRepetitionLevel = table.MaxRepetitionLevel
page.DataTable.Values = table.Values
page.DataTable.DefinitionLevels = table.DefinitionLevels
page.DataTable.RepetitionLevels = table.RepetitionLevels
page.DataType = dataType
page.CompressType = compressType
page.Path = table.Path
page.Info = table.Info
page.DictPageCompress(compressType, page.DataType)
totSize += int64(len(page.RawData))
return page, totSize
}