physical

package
v0.13.1 Latest Latest
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 Go to latest Published: Apr 14, 2022 License: Apache-2.0 Imports: 16 Imported by: 0

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Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func BreakExpressionInLHSandRHS 

func BreakExpressionInLHSandRHS(
	ctx *plancontext.PlanningContext,
	expr sqlparser.Expr,
	lhs semantics.TableSet,
) (bvNames []string, columns []*sqlparser.ColName, rewrittenExpr sqlparser.Expr, err error)

BreakExpressionInLHSandRHS takes an expression and extracts the parts that are coming from one of the sides into `ColName`s that are needed

func CreatePhysicalOperator 

func CreatePhysicalOperator(ctx *plancontext.PlanningContext, opTree abstract.LogicalOperator) (abstract.PhysicalOperator, error)

func PushOutputColumns 

func PushOutputColumns(ctx *plancontext.PlanningContext, op abstract.PhysicalOperator, columns ...*sqlparser.ColName) (abstract.PhysicalOperator, []int, error)

PushOutputColumns will push the columns to the table they originate from, making sure that intermediate operators pass the data through

func PushPredicate 

func PushPredicate(ctx *plancontext.PlanningContext, expr sqlparser.Expr, op abstract.PhysicalOperator) (abstract.PhysicalOperator, error)

PushPredicate is used to push predicates. It pushed it as far down as is possible in the tree. If we encounter a join and the predicate depends on both sides of the join, the predicate will be split into two parts, where data is fetched from the LHS of the join to be used in the evaluation on the RHS

func RemovePredicate 

func RemovePredicate(ctx *plancontext.PlanningContext, expr sqlparser.Expr, op abstract.PhysicalOperator) (abstract.PhysicalOperator, error)

RemovePredicate is used when we turn a predicate into a plan operator, and the predicate needs to be removed as an AST construct

func VisitOperators 

func VisitOperators(op abstract.PhysicalOperator, f func(tbl abstract.PhysicalOperator) (bool, error)) error

VisitOperators visits all the operators.

Types

type ApplyJoin 

type ApplyJoin struct {
	LHS, RHS abstract.PhysicalOperator

	// Columns stores the column indexes of the columns coming from the left and right side
	// negative value comes from LHS and positive from RHS
	Columns []int

	// Vars are the arguments that need to be copied from the LHS to the RHS
	Vars map[string]int

	// LeftJoin will be true in the case of an outer join
	LeftJoin bool

	Predicate sqlparser.Expr
}

ApplyJoin is a nested loop join - for each row on the LHS, we'll execute the plan on the RHS, feeding data from left to right

func (*ApplyJoin) CheckValid 

func (a *ApplyJoin) CheckValid() error

CheckValid implements the PhysicalOperator interface

func (*ApplyJoin) Clone 

func (a *ApplyJoin) Clone() abstract.PhysicalOperator

Clone implements the PhysicalOperator interface

func (*ApplyJoin) Compact 

func (a *ApplyJoin) Compact(semTable *semantics.SemTable) (abstract.Operator, error)

Compact implements the PhysicalOperator interface

func (*ApplyJoin) Cost 

func (a *ApplyJoin) Cost() int

Cost implements the PhysicalOperator interface

func (*ApplyJoin) IPhysical 

func (a *ApplyJoin) IPhysical()

IPhysical implements the PhysicalOperator interface

func (*ApplyJoin) TableID 

func (a *ApplyJoin) TableID() semantics.TableSet

TableID implements the PhysicalOperator interface

func (*ApplyJoin) UnsolvedPredicates 

func (a *ApplyJoin) UnsolvedPredicates(semTable *semantics.SemTable) []sqlparser.Expr

UnsolvedPredicates implements the PhysicalOperator interface

type CorrelatedSubQueryOp 

type CorrelatedSubQueryOp struct {
	Outer, Inner abstract.PhysicalOperator
	Extracted    *sqlparser.ExtractedSubquery
	// arguments that need to be copied from the outer to inner
	Vars map[string]int
}

func (*CorrelatedSubQueryOp) CheckValid 

func (c *CorrelatedSubQueryOp) CheckValid() error

func (*CorrelatedSubQueryOp) Clone 

func (c *CorrelatedSubQueryOp) Clone() abstract.PhysicalOperator

func (*CorrelatedSubQueryOp) Cost 

func (c *CorrelatedSubQueryOp) Cost() int

func (*CorrelatedSubQueryOp) IPhysical 

func (c *CorrelatedSubQueryOp) IPhysical()

func (*CorrelatedSubQueryOp) TableID 

func (c *CorrelatedSubQueryOp) TableID() semantics.TableSet

func (*CorrelatedSubQueryOp) UnsolvedPredicates 

func (c *CorrelatedSubQueryOp) UnsolvedPredicates(semTable *semantics.SemTable) []sqlparser.Expr

type Cost 

type Cost struct {
	VindexCost int
	IsUnique   bool
	OpCode     engine.Opcode
}

Cost is used to make it easy to compare the Cost of two plans with each other

type Derived 

type Derived struct {
	Source abstract.PhysicalOperator

	Query         sqlparser.SelectStatement
	Alias         string
	ColumnAliases sqlparser.Columns

	// Columns needed to feed other plans
	Columns       []*sqlparser.ColName
	ColumnsOffset []int
}

func (*Derived) CheckValid 

func (d *Derived) CheckValid() error

CheckValid implements the PhysicalOperator interface

func (*Derived) Clone 

func (d *Derived) Clone() abstract.PhysicalOperator

Clone implements the PhysicalOperator interface

func (*Derived) Cost 

func (d *Derived) Cost() int

Cost implements the PhysicalOperator interface

func (*Derived) IPhysical 

func (d *Derived) IPhysical()

IPhysical implements the PhysicalOperator interface

func (*Derived) TableID 

func (d *Derived) TableID() semantics.TableSet

TableID implements the PhysicalOperator interface

func (*Derived) UnsolvedPredicates 

func (d *Derived) UnsolvedPredicates(semTable *semantics.SemTable) []sqlparser.Expr

UnsolvedPredicates implements the PhysicalOperator interface

type Filter 

type Filter struct {
	Source     abstract.PhysicalOperator
	Predicates []sqlparser.Expr
}

func (*Filter) CheckValid 

func (f *Filter) CheckValid() error

CheckValid implements the PhysicalOperator interface

func (*Filter) Clone 

func (f *Filter) Clone() abstract.PhysicalOperator

Clone implements the PhysicalOperator interface

func (*Filter) Compact 

func (f *Filter) Compact(semTable *semantics.SemTable) (abstract.Operator, error)

Compact implements the PhysicalOperator interface

func (*Filter) Cost 

func (f *Filter) Cost() int

Cost implements the PhysicalOperator interface

func (*Filter) IPhysical 

func (f *Filter) IPhysical()

IPhysical implements the PhysicalOperator interface

func (*Filter) PushPredicate 

func (f *Filter) PushPredicate(expr sqlparser.Expr, semTable *semantics.SemTable) error

PushPredicate implements the PhysicalOperator interface

func (*Filter) TableID 

func (f *Filter) TableID() semantics.TableSet

TableID implements the PhysicalOperator interface

func (*Filter) UnsolvedPredicates 

func (f *Filter) UnsolvedPredicates(semTable *semantics.SemTable) []sqlparser.Expr

UnsolvedPredicates implements the PhysicalOperator interface

type Route 

type Route struct {
	Source abstract.PhysicalOperator

	RouteOpCode engine.Opcode
	Keyspace    *vindexes.Keyspace

	// here we store the possible vindexes we can use so that when we add predicates to the plan,
	// we can quickly check if the new predicates enables any new vindex Options
	VindexPreds []*VindexPlusPredicates

	// the best option available is stored here
	Selected *VindexOption

	// The following two fields are used when routing information_schema queries
	SysTableTableSchema []evalengine.Expr
	SysTableTableName   map[string]evalengine.Expr

	// SeenPredicates contains all the predicates that have had a chance to influence routing.
	// If we need to replan routing, we'll use this list
	SeenPredicates []sqlparser.Expr
}

func (*Route) CheckValid 

func (r *Route) CheckValid() error

CheckValid implements the Operator interface

func (*Route) Clone 

func (r *Route) Clone() abstract.PhysicalOperator

Clone implements the PhysicalOperator interface

func (*Route) Compact 

func (r *Route) Compact(semTable *semantics.SemTable) (abstract.Operator, error)

Compact implements the Operator interface

func (*Route) Cost 

func (r *Route) Cost() int

Cost implements the Operator interface

func (*Route) IPhysical 

func (*Route) IPhysical()

IPhysical implements the PhysicalOperator interface

func (*Route) IsSingleShard 

func (r *Route) IsSingleShard() bool

func (*Route) PickBestAvailableVindex 

func (r *Route) PickBestAvailableVindex()

PickBestAvailableVindex goes over the available vindexes for this route and picks the best one available.

func (*Route) SelectedVindex 

func (r *Route) SelectedVindex() vindexes.Vindex

func (*Route) TableID 

func (r *Route) TableID() semantics.TableSet

TableID implements the Operator interface

func (*Route) UnsolvedPredicates 

func (r *Route) UnsolvedPredicates(semTable *semantics.SemTable) []sqlparser.Expr

UnsolvedPredicates implements the Operator interface

func (*Route) UpdateRoutingLogic 

func (r *Route) UpdateRoutingLogic(ctx *plancontext.PlanningContext, expr sqlparser.Expr) error

func (*Route) VindexExpressions 

func (r *Route) VindexExpressions() []sqlparser.Expr

type SubQueryInner 

type SubQueryInner struct {
	Inner abstract.LogicalOperator

	// ExtractedSubquery contains all information we need about this subquery
	ExtractedSubquery *sqlparser.ExtractedSubquery
}

type SubQueryOp 

type SubQueryOp struct {
	Outer, Inner abstract.PhysicalOperator
	Extracted    *sqlparser.ExtractedSubquery
}

func (*SubQueryOp) CheckValid 

func (s *SubQueryOp) CheckValid() error

CheckValid implements the PhysicalOperator interface

func (*SubQueryOp) Clone 

func (s *SubQueryOp) Clone() abstract.PhysicalOperator

Clone implements the PhysicalOperator interface

func (*SubQueryOp) Cost 

func (s *SubQueryOp) Cost() int

Cost implements the PhysicalOperator interface

func (*SubQueryOp) IPhysical 

func (s *SubQueryOp) IPhysical()

IPhysical implements the PhysicalOperator interface

func (*SubQueryOp) TableID 

func (s *SubQueryOp) TableID() semantics.TableSet

TableID implements the PhysicalOperator interface

func (*SubQueryOp) UnsolvedPredicates 

func (s *SubQueryOp) UnsolvedPredicates(semTable *semantics.SemTable) []sqlparser.Expr

UnsolvedPredicates implements the PhysicalOperator interface

type Table 

type Table struct {
	QTable  *abstract.QueryTable
	VTable  *vindexes.Table
	Columns []*sqlparser.ColName
}

func (*Table) CheckValid 

func (to *Table) CheckValid() error

CheckValid implements the PhysicalOperator interface

func (*Table) Clone 

func (to *Table) Clone() abstract.PhysicalOperator

Clone implements the PhysicalOperator interface

func (*Table) Compact 

func (to *Table) Compact(semTable *semantics.SemTable) (abstract.Operator, error)

Compact implements the PhysicalOperator interface

func (*Table) Cost 

func (to *Table) Cost() int

Cost implements the PhysicalOperator interface

func (*Table) IPhysical 

func (to *Table) IPhysical()

IPhysical implements the PhysicalOperator interface

func (*Table) PushPredicate 

func (to *Table) PushPredicate(expr sqlparser.Expr, semTable *semantics.SemTable) error

PushPredicate implements the PhysicalOperator interface

func (*Table) TableID 

func (to *Table) TableID() semantics.TableSet

TableID implements the PhysicalOperator interface

func (*Table) UnsolvedPredicates 

func (to *Table) UnsolvedPredicates(semTable *semantics.SemTable) []sqlparser.Expr

UnsolvedPredicates implements the PhysicalOperator interface

type Union 

type Union struct {
	Sources     []abstract.PhysicalOperator
	SelectStmts []*sqlparser.Select
	Distinct    bool

	// TODO this should be removed. For now it's used to fail queries
	Ordering sqlparser.OrderBy
}

func (*Union) CheckValid 

func (u *Union) CheckValid() error

CheckValid implements the PhysicalOperator interface

func (*Union) Clone 

func (u *Union) Clone() abstract.PhysicalOperator

Clone implements the PhysicalOperator interface

func (*Union) Cost 

func (u *Union) Cost() int

Cost implements the PhysicalOperator interface

func (*Union) IPhysical 

func (u *Union) IPhysical()

IPhysical implements the PhysicalOperator interface

func (*Union) TableID 

func (u *Union) TableID() semantics.TableSet

TableID implements the PhysicalOperator interface

func (*Union) UnsolvedPredicates 

func (u *Union) UnsolvedPredicates(*semantics.SemTable) []sqlparser.Expr

UnsolvedPredicates implements the PhysicalOperator interface

type Vindex 

type Vindex struct {
	OpCode  engine.VindexOpcode
	Table   abstract.VindexTable
	Vindex  vindexes.Vindex
	Solved  semantics.TableSet
	Columns []*sqlparser.ColName
	Value   sqlparser.Expr
}

func (*Vindex) CheckValid 

func (v *Vindex) CheckValid() error

CheckValid implements the Operator interface

func (*Vindex) Clone 

func (v *Vindex) Clone() abstract.PhysicalOperator

Clone implements the PhysicalOperator interface

func (*Vindex) Cost 

func (v *Vindex) Cost() int

Cost implements the PhysicalOperator interface

func (*Vindex) IPhysical 

func (v *Vindex) IPhysical()

IPhysical implements the PhysicalOperator interface

func (*Vindex) PushOutputColumns 

func (v *Vindex) PushOutputColumns(columns []*sqlparser.ColName) ([]int, error)

func (*Vindex) TableID 

func (v *Vindex) TableID() semantics.TableSet

TableID implements the Operator interface

func (*Vindex) UnsolvedPredicates 

func (v *Vindex) UnsolvedPredicates(*semantics.SemTable) []sqlparser.Expr

UnsolvedPredicates implements the Operator interface

type VindexOption 

type VindexOption struct {
	Ready  bool
	Values []evalengine.Expr
	// columns that we have seen so far. Used only for multi-column vindexes so that we can track how many columns part of the vindex we have seen
	ColsSeen    map[string]interface{}
	ValueExprs  []sqlparser.Expr
	Predicates  []sqlparser.Expr
	OpCode      engine.Opcode
	FoundVindex vindexes.Vindex
	Cost        Cost
}

VindexOption stores the information needed to know if we have all the information needed to use a vindex

type VindexPlusPredicates 

type VindexPlusPredicates struct {
	TableID   semantics.TableSet
	ColVindex *vindexes.ColumnVindex

	// during planning, we store the alternatives found for this route in this slice
	Options []*VindexOption
}

VindexPlusPredicates is a struct used to store all the predicates that the vindex can be used to query

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