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table.go
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table.go
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package layout
import (
"github.com/xitongsys/parquet-go/common"
"github.com/xitongsys/parquet-go/parquet"
)
func NewTableFromTable(src *Table) *Table {
if src == nil {
return nil
}
table := new(Table)
table.Type = src.Type
table.Path = append(table.Path, src.Path...)
table.MaxDefinitionLevel = 0
table.MaxRepetitionLevel = 0
table.Info = src.Info
return table
}
func NewEmptyTable() *Table {
table := new(Table)
table.Info = common.NewTag()
return table
}
//Table is the core data structure used to store the values
type Table struct {
//Repetition type of the values: REQUIRED/OPTIONAL/REPEATED
RepetitionType parquet.FieldRepetitionType
//Parquet type
Type parquet.Type
//Path of this column
Path []string
//Maximum of definition levels
MaxDefinitionLevel int32
//Maximum of repetition levels
MaxRepetitionLevel int32
//Parquet values
Values []interface{}
//Definition Levels slice
DefinitionLevels []int32
//Repetition Levels slice
RepetitionLevels []int32
//Tag info
Info *common.Tag
}
//Merge several tables to one table(the first table)
func (self *Table) Merge(tables ...*Table) {
ln := len(tables)
if ln <= 0 {
return
}
for i := 0; i < ln; i++ {
if tables[i] == nil {
continue
}
self.Values = append(self.Values, tables[i].Values...)
self.RepetitionLevels = append(self.RepetitionLevels, tables[i].RepetitionLevels...)
self.DefinitionLevels = append(self.DefinitionLevels, tables[i].DefinitionLevels...)
if tables[i].MaxDefinitionLevel > self.MaxDefinitionLevel {
self.MaxDefinitionLevel = tables[i].MaxDefinitionLevel
}
if tables[i].MaxRepetitionLevel > self.MaxRepetitionLevel {
self.MaxRepetitionLevel = tables[i].MaxRepetitionLevel
}
}
}
func (self *Table) Pop(numRows int64) *Table {
res := NewTableFromTable(self)
endIndex := int64(0)
ln := int64(len(self.Values))
i, num := int64(0), int64(-1)
for i = 0; i < ln; i++ {
if self.RepetitionLevels[i] == 0 {
num++
if num >= numRows {
break
}
}
if res.MaxRepetitionLevel < self.RepetitionLevels[i] {
res.MaxRepetitionLevel = self.RepetitionLevels[i]
}
if res.MaxDefinitionLevel < self.DefinitionLevels[i] {
res.MaxDefinitionLevel = self.DefinitionLevels[i]
}
}
endIndex = i
res.RepetitionLevels = self.RepetitionLevels[:endIndex]
res.DefinitionLevels = self.DefinitionLevels[:endIndex]
res.Values = self.Values[:endIndex]
self.RepetitionLevels = self.RepetitionLevels[endIndex:]
self.DefinitionLevels = self.DefinitionLevels[endIndex:]
self.Values = self.Values[endIndex:]
return res
}