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page_header.go
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page_header.go
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package parquet
import (
"fmt"
"github.com/segmentio/parquet-go/format"
)
// PageHeader is an interface implemented by parquet page headers.
type PageHeader interface {
// Returns the number of values in the page (including nulls).
NumValues() int64
// Returns the page encoding.
Encoding() format.Encoding
// Returns the parquet format page type.
PageType() format.PageType
}
// DataPageHeader is a specialization of the PageHeader interface implemented by
// data pages.
type DataPageHeader interface {
PageHeader
// Returns the encoding of the repetition level section.
RepetitionLevelEncoding() format.Encoding
// Returns the encoding of the definition level section.
DefinitionLevelEncoding() format.Encoding
// Returns the number of null values in the page.
NullCount() int64
// Returns the minimum value in the page based on the ordering rules of the
// column's logical type.
//
// As an optimization, the method may return the same slice across multiple
// calls. Programs must treat the returned value as immutable to prevent
// unpredictable behaviors.
//
// If the page only contains only null values, an empty slice is returned.
MinValue() []byte
// Returns the maximum value in the page based on the ordering rules of the
// column's logical type.
//
// As an optimization, the method may return the same slice across multiple
// calls. Programs must treat the returned value as immutable to prevent
// unpredictable behaviors.
//
// If the page only contains only null values, an empty slice is returned.
MaxValue() []byte
}
// DictionaryPageHeader is an implementation of the PageHeader interface
// representing dictionary pages.
type DictionaryPageHeader struct {
header *format.DictionaryPageHeader
}
func (dict DictionaryPageHeader) NumValues() int64 {
return int64(dict.header.NumValues)
}
func (dict DictionaryPageHeader) Encoding() format.Encoding {
return dict.header.Encoding
}
func (dict DictionaryPageHeader) PageType() format.PageType {
return format.DictionaryPage
}
func (dict DictionaryPageHeader) IsSorted() bool {
return dict.header.IsSorted
}
func (dict DictionaryPageHeader) String() string {
return fmt.Sprintf("DICTIONARY_PAGE_HEADER{NumValues=%d,Encoding=%s,IsSorted=%t}",
dict.header.NumValues,
dict.header.Encoding,
dict.header.IsSorted)
}
// DataPageHeaderV1 is an implementation of the DataPageHeader interface
// representing data pages version 1.
type DataPageHeaderV1 struct {
header *format.DataPageHeader
}
func (v1 DataPageHeaderV1) NumValues() int64 {
return int64(v1.header.NumValues)
}
func (v1 DataPageHeaderV1) RepetitionLevelEncoding() format.Encoding {
return v1.header.RepetitionLevelEncoding
}
func (v1 DataPageHeaderV1) DefinitionLevelEncoding() format.Encoding {
return v1.header.DefinitionLevelEncoding
}
func (v1 DataPageHeaderV1) Encoding() format.Encoding {
return v1.header.Encoding
}
func (v1 DataPageHeaderV1) PageType() format.PageType {
return format.DataPage
}
func (v1 DataPageHeaderV1) NullCount() int64 {
return v1.header.Statistics.NullCount
}
func (v1 DataPageHeaderV1) MinValue() []byte {
return v1.header.Statistics.MinValue
}
func (v1 DataPageHeaderV1) MaxValue() []byte {
return v1.header.Statistics.MaxValue
}
func (v1 DataPageHeaderV1) String() string {
return fmt.Sprintf("DATA_PAGE_HEADER{NumValues=%d,Encoding=%s}",
v1.header.NumValues,
v1.header.Encoding)
}
// DataPageHeaderV2 is an implementation of the DataPageHeader interface
// representing data pages version 2.
type DataPageHeaderV2 struct {
header *format.DataPageHeaderV2
}
func (v2 DataPageHeaderV2) NumValues() int64 {
return int64(v2.header.NumValues)
}
func (v2 DataPageHeaderV2) NumNulls() int64 {
return int64(v2.header.NumNulls)
}
func (v2 DataPageHeaderV2) NumRows() int64 {
return int64(v2.header.NumRows)
}
func (v2 DataPageHeaderV2) RepetitionLevelsByteLength() int64 {
return int64(v2.header.RepetitionLevelsByteLength)
}
func (v2 DataPageHeaderV2) DefinitionLevelsByteLength() int64 {
return int64(v2.header.DefinitionLevelsByteLength)
}
func (v2 DataPageHeaderV2) RepetitionLevelEncoding() format.Encoding {
return format.RLE
}
func (v2 DataPageHeaderV2) DefinitionLevelEncoding() format.Encoding {
return format.RLE
}
func (v2 DataPageHeaderV2) Encoding() format.Encoding {
return v2.header.Encoding
}
func (v2 DataPageHeaderV2) PageType() format.PageType {
return format.DataPageV2
}
func (v2 DataPageHeaderV2) NullCount() int64 {
return v2.header.Statistics.NullCount
}
func (v2 DataPageHeaderV2) MinValue() []byte {
return v2.header.Statistics.MinValue
}
func (v2 DataPageHeaderV2) MaxValue() []byte {
return v2.header.Statistics.MaxValue
}
func (v2 DataPageHeaderV2) IsCompressed() bool {
return v2.header.IsCompressed == nil || *v2.header.IsCompressed
}
func (v2 DataPageHeaderV2) String() string {
return fmt.Sprintf("DATA_PAGE_HEADER_V2{NumValues=%d,NumNulls=%d,NumRows=%d,Encoding=%s,IsCompressed=%t}",
v2.header.NumValues,
v2.header.NumNulls,
v2.header.NumRows,
v2.header.Encoding,
v2.IsCompressed())
}
type unknownPageHeader struct {
header *format.PageHeader
}
func (u unknownPageHeader) NumValues() int64 {
return 0
}
func (u unknownPageHeader) Encoding() format.Encoding {
return -1
}
func (u unknownPageHeader) PageType() format.PageType {
return u.header.Type
}
func (u unknownPageHeader) String() string {
return fmt.Sprintf("UNKNOWN_PAGE_HEADER{Type=%d}", u.header.Type)
}
var (
_ PageHeader = DictionaryPageHeader{}
_ DataPageHeader = DataPageHeaderV1{}
_ DataPageHeader = DataPageHeaderV2{}
_ PageHeader = unknownPageHeader{}
)