ranger

Documentation

Index

• Constants
• Variables
• func DetachCondsForTableRange(ctx context.Context, conds []expression.Expression, col *expression.Column) (accessContditions, otherConditions []expression.Expression)
• func DetachIndexConditions(conditions []expression.Expression, cols []*expression.Column, lengths []int) (accessConds []expression.Expression, filterConds []expression.Expression)
• func ExtractAccessConditions(conds []expression.Expression, rangeType RangeType, cols []*expression.Column, ...) []expression.Expression
• type IntColumnRange
  • func FullIntRange() []IntColumnRange
  • func (tr *IntColumnRange) IsPoint() bool
  • func (tr IntColumnRange) String() string
• type NewRange
  • func BuildColumnRange(conds []expression.Expression, sc *stmtctx.StatementContext, ...) ([]*NewRange, error)
  • func BuildIndexRange(sc *stmtctx.StatementContext, cols []*expression.Column, lengths []int, ...) ([]*NewRange, error)
  • func BuildTableRange(accessConditions []expression.Expression, sc *stmtctx.StatementContext, ...) ([]*NewRange, error)
  • func FullIntNewRange(isUnsigned bool) []*NewRange
  • func FullNewRange() []*NewRange
  • func (ran *NewRange) Clone() *NewRange
  • func (ran *NewRange) IsPoint(sc *stmtctx.StatementContext) bool
  • func (ran *NewRange) PrefixEqualLen(sc *stmtctx.StatementContext) (int, error)
  • func (ran *NewRange) String() string
• type RangeType

Constants

const (
	CodeUnsupportedType terror.ErrCode = 1
)

Error codes.

Variables

var (
	ErrUnsupportedType = terror.ClassOptimizerPlan.New(CodeUnsupportedType, "Unsupported type")
)

Error instances.

Functions

func DetachCondsForTableRange

func DetachCondsForTableRange(ctx context.Context, conds []expression.Expression, col *expression.Column) (accessContditions, otherConditions []expression.Expression)

DetachCondsForTableRange detaches the conditions used for range calculation form other useless conditions for calculating the table range.

func DetachIndexConditions

func DetachIndexConditions(conditions []expression.Expression, cols []*expression.Column,
	lengths []int) (accessConds []expression.Expression, filterConds []expression.Expression)

DetachIndexConditions will detach the index filters from table filters. It will first find the point query column and then extract the range query column.

func ExtractAccessConditions

func ExtractAccessConditions(conds []expression.Expression, rangeType RangeType, cols []*expression.Column,
	lengths []int) []expression.Expression

ExtractAccessConditions detaches the access conditions used for range calculation.

Types

type IntColumnRange

type IntColumnRange struct {
	LowVal  int64
	HighVal int64
}

IntColumnRange represents a range for a integer column, both low and high are inclusive.

func FullIntRange

func FullIntRange() []IntColumnRange

FullIntRange is (-∞, +∞) for IntColumnRange.

func (*IntColumnRange) IsPoint

func (tr *IntColumnRange) IsPoint() bool

IsPoint returns if the table range is a point.

func (IntColumnRange) String

func (tr IntColumnRange) String() string

type NewRange

type NewRange struct {
	LowVal  []types.Datum
	HighVal []types.Datum

	LowExclude  bool // Low value is exclusive.
	HighExclude bool // High value is exclusive.
}

NewRange represents a range generated in physical plan building phase.

func BuildColumnRange

func BuildColumnRange(conds []expression.Expression, sc *stmtctx.StatementContext, tp *types.FieldType) ([]*NewRange, error)

BuildColumnRange builds the range for sampling histogram to calculate the row count.

func BuildIndexRange

func BuildIndexRange(sc *stmtctx.StatementContext, cols []*expression.Column, lengths []int,
	accessCondition []expression.Expression) ([]*NewRange, error)

BuildIndexRange builds the range for index.

func BuildTableRange

func BuildTableRange(accessConditions []expression.Expression, sc *stmtctx.StatementContext, tp *types.FieldType) ([]*NewRange, error)

BuildTableRange will build range of pk for PhysicalTableScan

func FullIntNewRange

func FullIntNewRange(isUnsigned bool) []*NewRange

FullIntNewRange is used for table range. Since table range cannot accept MaxValueDatum as the max value. So we need to set it to MaxInt64.

func FullNewRange

func FullNewRange() []*NewRange

FullNewRange is (-∞, +∞) for NewRange.

func (*NewRange) Clone

func (ran *NewRange) Clone() *NewRange

Clone clones a NewRange.

func (*NewRange) IsPoint

func (ran *NewRange) IsPoint(sc *stmtctx.StatementContext) bool

IsPoint returns if the range is a point.

func (*NewRange) PrefixEqualLen

func (ran *NewRange) PrefixEqualLen(sc *stmtctx.StatementContext) (int, error)

PrefixEqualLen tells you how long the prefix of the range is a point. e.g. If this range is (1 2 3, 1 2 +inf), then the return value is 2.

func (*NewRange) String

func (ran *NewRange) String() string

Convert2NewRange implements the Convert2NewRange interface.

type RangeType

type RangeType int

RangeType is alias for int.

const (
	IntRangeType RangeType = iota
	ColumnRangeType
	IndexRangeType
)

RangeType constants.