cursors

package
v2.0.0-beta.10 Latest Latest
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 Go to latest Published: May 7, 2020 License: MIT Imports: 5 Imported by: 2

Documentation

Index

Constants

View Source 
const DefaultMaxPointsPerBlock = 1000

Variables

View Source 
var EmptyMeasurementFieldsIterator = &measurementFieldsIterator{}

EmptyMeasurementFieldsIterator is an implementation of MeasurementFieldsIterator that returns no values.

Functions

func FieldTypeToDataType 

func FieldTypeToDataType(ft FieldType) influxql.DataType

FieldTypeToDataType returns the equivalent influxql DataType for the field type ft. If ft is an invalid FieldType, the results are undefined.

func StringIteratorToSlice 

func StringIteratorToSlice(i StringIterator) []string

StringIteratorToSlice reads the remainder of i into a slice and returns the result.

Types

type BooleanArray 

type BooleanArray struct {
	Timestamps []int64
	Values     []bool
}

func NewBooleanArrayLen 

func NewBooleanArrayLen(sz int) *BooleanArray

func (*BooleanArray) Exclude 

func (a *BooleanArray) Exclude(min, max int64)

Exclude removes the subset of values in [min, max]. The values must be deduplicated and sorted before calling Exclude or the results are undefined.

func (*BooleanArray) FindRange 

func (a *BooleanArray) FindRange(min, max int64) (int, int)

FindRange returns the positions where min and max would be inserted into the array. If a[0].UnixNano() > max or a[len-1].UnixNano() < min then FindRange returns (-1, -1) indicating the array is outside the [min, max]. The values must be deduplicated and sorted before calling FindRange or the results are undefined.

func (*BooleanArray) Include 

func (a *BooleanArray) Include(min, max int64)

Include returns the subset values between min and max inclusive. The values must be deduplicated and sorted before calling Include or the results are undefined.

func (*BooleanArray) Len 

func (a *BooleanArray) Len() int

func (*BooleanArray) MaxTime 

func (a *BooleanArray) MaxTime() int64

func (*BooleanArray) Merge 

func (a *BooleanArray) Merge(b *BooleanArray)

Merge overlays b to top of a. If two values conflict with the same timestamp, b is used. Both a and b must be sorted in ascending order.

func (*BooleanArray) MinTime 

func (a *BooleanArray) MinTime() int64

func (*BooleanArray) Size 

func (a *BooleanArray) Size() int

type BooleanArrayCursor 

type BooleanArrayCursor interface {
	Cursor
	Next() *BooleanArray
}

type Cursor 

type Cursor interface {
	Close()
	Err() error
	Stats() CursorStats
}

type CursorIterator 

type CursorIterator interface {
	Next(ctx context.Context, r *CursorRequest) (Cursor, error)
	Stats() CursorStats
}

type CursorRequest 

type CursorRequest struct {
	Name      []byte
	Tags      models.Tags
	Field     string
	Ascending bool
	StartTime int64
	EndTime   int64
}

type CursorStats 

type CursorStats struct {
	ScannedValues int // number of values scanned
	ScannedBytes  int // number of uncompressed bytes scanned
}

CursorStats represents stats collected by a cursor.

func (*CursorStats) Add 

func (s *CursorStats) Add(other CursorStats)

Add adds other to s and updates s.

type FieldType 

type FieldType int

FieldType represents the primitive field data types available in tsm. 

const (
	Float     FieldType = iota // means the data type is a float
	Integer                    // means the data type is an integer
	Unsigned                   // means the data type is an unsigned integer
	String                     // means the data type is a string of text
	Boolean                    // means the data type is a boolean
	Undefined                  // means the data type in unknown or undefined
)

func (FieldType) IsLower 

func (ft FieldType) IsLower(other FieldType) bool

IsLower returns true if the other FieldType has greater precedence than the current value. Undefined has the lowest precedence.

func (FieldType) String 

func (i FieldType) String() string

type FloatArray 

type FloatArray struct {
	Timestamps []int64
	Values     []float64
}

func NewFloatArrayLen 

func NewFloatArrayLen(sz int) *FloatArray

func (*FloatArray) Exclude 

func (a *FloatArray) Exclude(min, max int64)

Exclude removes the subset of values in [min, max]. The values must be deduplicated and sorted before calling Exclude or the results are undefined.

func (*FloatArray) FindRange 

func (a *FloatArray) FindRange(min, max int64) (int, int)

FindRange returns the positions where min and max would be inserted into the array. If a[0].UnixNano() > max or a[len-1].UnixNano() < min then FindRange returns (-1, -1) indicating the array is outside the [min, max]. The values must be deduplicated and sorted before calling FindRange or the results are undefined.

func (*FloatArray) Include 

func (a *FloatArray) Include(min, max int64)

Include returns the subset values between min and max inclusive. The values must be deduplicated and sorted before calling Include or the results are undefined.

func (*FloatArray) Len 

func (a *FloatArray) Len() int

func (*FloatArray) MaxTime 

func (a *FloatArray) MaxTime() int64

func (*FloatArray) Merge 

func (a *FloatArray) Merge(b *FloatArray)

Merge overlays b to top of a. If two values conflict with the same timestamp, b is used. Both a and b must be sorted in ascending order.

func (*FloatArray) MinTime 

func (a *FloatArray) MinTime() int64

func (*FloatArray) Size 

func (a *FloatArray) Size() int

type FloatArrayCursor 

type FloatArrayCursor interface {
	Cursor
	Next() *FloatArray
}

type IntegerArray 

type IntegerArray struct {
	Timestamps []int64
	Values     []int64
}

func NewIntegerArrayLen 

func NewIntegerArrayLen(sz int) *IntegerArray

func (*IntegerArray) Exclude 

func (a *IntegerArray) Exclude(min, max int64)

Exclude removes the subset of values in [min, max]. The values must be deduplicated and sorted before calling Exclude or the results are undefined.

func (*IntegerArray) FindRange 

func (a *IntegerArray) FindRange(min, max int64) (int, int)

FindRange returns the positions where min and max would be inserted into the array. If a[0].UnixNano() > max or a[len-1].UnixNano() < min then FindRange returns (-1, -1) indicating the array is outside the [min, max]. The values must be deduplicated and sorted before calling FindRange or the results are undefined.

func (*IntegerArray) Include 

func (a *IntegerArray) Include(min, max int64)

Include returns the subset values between min and max inclusive. The values must be deduplicated and sorted before calling Include or the results are undefined.

func (*IntegerArray) Len 

func (a *IntegerArray) Len() int

func (*IntegerArray) MaxTime 

func (a *IntegerArray) MaxTime() int64

func (*IntegerArray) Merge 

func (a *IntegerArray) Merge(b *IntegerArray)

Merge overlays b to top of a. If two values conflict with the same timestamp, b is used. Both a and b must be sorted in ascending order.

func (*IntegerArray) MinTime 

func (a *IntegerArray) MinTime() int64

func (*IntegerArray) Size 

func (a *IntegerArray) Size() int

type IntegerArrayCursor 

type IntegerArrayCursor interface {
	Cursor
	Next() *IntegerArray
}

type MeasurementField 

type MeasurementField struct {
	Key       string    // Key is the name of the field
	Type      FieldType // Type is field type
	Timestamp int64     // Timestamp refers to the maximum timestamp observed for the given field
}

func MeasurementFieldsIteratorFlatMap 

func MeasurementFieldsIteratorFlatMap(i MeasurementFieldsIterator) []MeasurementField

MeasurementFieldsIteratorFlatMap reads the remainder of i, flattening the results to a single slice.

type MeasurementFieldSlice 

type MeasurementFieldSlice []MeasurementField

MeasurementFieldSlice implements sort.Interface and sorts the slice from lowest to highest precedence. Use sort.Reverse to sort from highest to lowest.

func (MeasurementFieldSlice) Len 

func (m MeasurementFieldSlice) Len() int

func (MeasurementFieldSlice) Less 

func (m MeasurementFieldSlice) Less(i, j int) bool

func (MeasurementFieldSlice) Swap 

func (m MeasurementFieldSlice) Swap(i, j int)

func (*MeasurementFieldSlice) UniqueByKey 

func (m *MeasurementFieldSlice) UniqueByKey()

UniqueByKey performs an in-place update of m, removing duplicate elements by Key, keeping the first occurrence of each. If the slice is not sorted, the behavior of UniqueByKey is undefined.

type MeasurementFields 

type MeasurementFields struct {
	Fields []MeasurementField
}

type MeasurementFieldsIterator 

type MeasurementFieldsIterator interface {
	// Next advances the iterator to the next value. It returns false
	// when there are no more values.
	Next() bool

	// Value returns the current value.
	Value() MeasurementFields

	Stats() CursorStats
}

type MeasurementFieldsSliceIterator 

type MeasurementFieldsSliceIterator struct {
	// contains filtered or unexported fields
}

func NewMeasurementFieldsSliceIteratorWithStats 

func NewMeasurementFieldsSliceIteratorWithStats(f []MeasurementFields, stats CursorStats) *MeasurementFieldsSliceIterator

func (*MeasurementFieldsSliceIterator) Next 

func (s *MeasurementFieldsSliceIterator) Next() bool

func (*MeasurementFieldsSliceIterator) Stats 

func (s *MeasurementFieldsSliceIterator) Stats() CursorStats

func (*MeasurementFieldsSliceIterator) Value 

func (s *MeasurementFieldsSliceIterator) Value() MeasurementFields

type StringArray 

type StringArray struct {
	Timestamps []int64
	Values     []string
}

func NewStringArrayLen 

func NewStringArrayLen(sz int) *StringArray

func (*StringArray) Exclude 

func (a *StringArray) Exclude(min, max int64)

Exclude removes the subset of values in [min, max]. The values must be deduplicated and sorted before calling Exclude or the results are undefined.

func (*StringArray) FindRange 

func (a *StringArray) FindRange(min, max int64) (int, int)

FindRange returns the positions where min and max would be inserted into the array. If a[0].UnixNano() > max or a[len-1].UnixNano() < min then FindRange returns (-1, -1) indicating the array is outside the [min, max]. The values must be deduplicated and sorted before calling FindRange or the results are undefined.

func (*StringArray) Include 

func (a *StringArray) Include(min, max int64)

Include returns the subset values between min and max inclusive. The values must be deduplicated and sorted before calling Include or the results are undefined.

func (*StringArray) Len 

func (a *StringArray) Len() int

func (*StringArray) MaxTime 

func (a *StringArray) MaxTime() int64

func (*StringArray) Merge 

func (a *StringArray) Merge(b *StringArray)

Merge overlays b to top of a. If two values conflict with the same timestamp, b is used. Both a and b must be sorted in ascending order.

func (*StringArray) MinTime 

func (a *StringArray) MinTime() int64

func (*StringArray) Size 

func (a *StringArray) Size() int

type StringArrayCursor 

type StringArrayCursor interface {
	Cursor
	Next() *StringArray
}

type StringIterator 

type StringIterator interface {
	// Next advances the StringIterator to the next value. It returns false
	// when there are no more values.
	Next() bool

	// Value returns the current value.
	Value() string

	Stats() CursorStats
}

StringIterator describes the behavior for enumerating a sequence of string values. 

var EmptyStringIterator StringIterator = &stringIterator{}

EmptyStringIterator is an implementation of StringIterator that returns no values.

type StringSliceIterator 

type StringSliceIterator struct {
	// contains filtered or unexported fields
}

func NewStringSliceIterator 

func NewStringSliceIterator(s []string) *StringSliceIterator

func NewStringSliceIteratorWithStats 

func NewStringSliceIteratorWithStats(s []string, stats CursorStats) *StringSliceIterator

func (*StringSliceIterator) Next 

func (s *StringSliceIterator) Next() bool

func (*StringSliceIterator) Stats 

func (s *StringSliceIterator) Stats() CursorStats

func (*StringSliceIterator) Value 

func (s *StringSliceIterator) Value() string

type TimestampArray 

type TimestampArray struct {
	Timestamps []int64
}

func NewTimestampArrayLen 

func NewTimestampArrayLen(sz int) *TimestampArray

func (*TimestampArray) Contains 

func (a *TimestampArray) Contains(min, max int64) bool

Contains returns true if values exist between min and max inclusive. The values must be sorted before calling Contains or the results are undefined.

func (*TimestampArray) Exclude 

func (a *TimestampArray) Exclude(min, max int64)

Exclude removes the subset of timestamps in [min, max]. The timestamps must be deduplicated and sorted before calling Exclude or the results are undefined.

func (*TimestampArray) FindRange 

func (a *TimestampArray) FindRange(min, max int64) (int, int)

FindRange returns the positions where min and max would be inserted into the array. If a[0].UnixNano() > max or a[len-1].UnixNano() < min then FindRange returns (-1, -1) indicating the array is outside the [min, max]. The values must be deduplicated and sorted before calling FindRange or the results are undefined.

func (*TimestampArray) Len 

func (a *TimestampArray) Len() int

func (*TimestampArray) Less 

func (a *TimestampArray) Less(i, j int) bool

func (*TimestampArray) MaxTime 

func (a *TimestampArray) MaxTime() int64

func (*TimestampArray) MinTime 

func (a *TimestampArray) MinTime() int64

func (*TimestampArray) Swap 

func (a *TimestampArray) Swap(i, j int)

type UnsignedArray 

type UnsignedArray struct {
	Timestamps []int64
	Values     []uint64
}

func NewUnsignedArrayLen 

func NewUnsignedArrayLen(sz int) *UnsignedArray

func (*UnsignedArray) Exclude 

func (a *UnsignedArray) Exclude(min, max int64)

Exclude removes the subset of values in [min, max]. The values must be deduplicated and sorted before calling Exclude or the results are undefined.

func (*UnsignedArray) FindRange 

func (a *UnsignedArray) FindRange(min, max int64) (int, int)

FindRange returns the positions where min and max would be inserted into the array. If a[0].UnixNano() > max or a[len-1].UnixNano() < min then FindRange returns (-1, -1) indicating the array is outside the [min, max]. The values must be deduplicated and sorted before calling FindRange or the results are undefined.

func (*UnsignedArray) Include 

func (a *UnsignedArray) Include(min, max int64)

Include returns the subset values between min and max inclusive. The values must be deduplicated and sorted before calling Include or the results are undefined.

func (*UnsignedArray) Len 

func (a *UnsignedArray) Len() int

func (*UnsignedArray) MaxTime 

func (a *UnsignedArray) MaxTime() int64

func (*UnsignedArray) Merge 

func (a *UnsignedArray) Merge(b *UnsignedArray)

Merge overlays b to top of a. If two values conflict with the same timestamp, b is used. Both a and b must be sorted in ascending order.

func (*UnsignedArray) MinTime 

func (a *UnsignedArray) MinTime() int64

func (*UnsignedArray) Size 

func (a *UnsignedArray) Size() int

type UnsignedArrayCursor 

type UnsignedArrayCursor interface {
	Cursor
	Next() *UnsignedArray
}

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