plancontext

Documentation

Index

• type PlannerVersion
  • func PlannerNameToVersion(s string) (PlannerVersion, bool)
• type PlanningContext
  • func NewPlanningContext(reservedVars *sqlparser.ReservedVars, semTable *semantics.SemTable, ...) *PlanningContext
  • func (c PlanningContext) IsSubQueryToReplace(e sqlparser.Expr) bool
• type VSchema

Types

type PlannerVersion

type PlannerVersion = querypb.ExecuteOptions_PlannerVersion

PlannerVersion is an alias here to make the code more readable

func PlannerNameToVersion

func PlannerNameToVersion(s string) (PlannerVersion, bool)

PlannerNameToVersion returns the numerical representation of the planner

type PlanningContext

type PlanningContext struct {
	ReservedVars *sqlparser.ReservedVars
	SemTable     *semantics.SemTable
	VSchema      VSchema

	// here we add all predicates that were created because of a join condition
	// e.g. [FROM tblA JOIN tblB ON a.colA = b.colB] will be rewritten to [FROM tblB WHERE :a_colA = b.colB],
	// if we assume that tblB is on the RHS of the join. This last predicate in the WHERE clause is added to the
	// map below
	JoinPredicates map[sqlparser.Expr][]sqlparser.Expr
	SkipPredicates map[sqlparser.Expr]interface{}
	PlannerVersion querypb.ExecuteOptions_PlannerVersion
}

func NewPlanningContext

func NewPlanningContext(reservedVars *sqlparser.ReservedVars, semTable *semantics.SemTable, vschema VSchema, version querypb.ExecuteOptions_PlannerVersion) *PlanningContext

func (PlanningContext) IsSubQueryToReplace

func (c PlanningContext) IsSubQueryToReplace(e sqlparser.Expr) bool

type VSchema

type VSchema interface {
	FindTable(tablename sqlparser.TableName) (*vindexes.Table, string, topodatapb.TabletType, key.Destination, error)
	FindTableOrVindex(tablename sqlparser.TableName) (*vindexes.Table, vindexes.Vindex, string, topodatapb.TabletType, key.Destination, error)
	DefaultKeyspace() (*vindexes.Keyspace, error)
	TargetString() string
	Destination() key.Destination
	TabletType() topodatapb.TabletType
	TargetDestination(qualifier string) (key.Destination, *vindexes.Keyspace, topodatapb.TabletType, error)
	AnyKeyspace() (*vindexes.Keyspace, error)
	FirstSortedKeyspace() (*vindexes.Keyspace, error)
	SysVarSetEnabled() bool
	KeyspaceExists(keyspace string) bool
	AllKeyspace() ([]*vindexes.Keyspace, error)
	FindKeyspace(keyspace string) (*vindexes.Keyspace, error)
	GetSemTable() *semantics.SemTable
	Planner() PlannerVersion
	SetPlannerVersion(pv PlannerVersion)
	ConnCollation() collations.ID

	// ErrorIfShardedF will return an error if the keyspace is sharded,
	// and produce a warning if the vtgate if configured to do so
	ErrorIfShardedF(keyspace *vindexes.Keyspace, warn, errFmt string, params ...interface{}) error

	// WarnUnshardedOnly is used when a feature is only supported in unsharded mode.
	// This will let the user know that they are using something
	// that could become a problem if they move to a sharded keyspace
	WarnUnshardedOnly(format string, params ...interface{})

	// PlannerWarning records warning created during planning.
	PlannerWarning(message string)

	// ForeignKeyMode returns the foreign_key flag value
	ForeignKeyMode() string
}

VSchema defines the interface for this package to fetch info about tables.