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Memoize encode plans 

This significantly reduces memory allocations in paths that repeatedly
encode the same type of values such as CopyFrom.

https://github.com/jackc/pgx/issues/1481
pull/1490/head
Jack Christensen 2023-01-27 20:19:06 -06:00
parent 7941518809
commit 42a47194a2
1 changed files with 28 additions and 2 deletions
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30
pgtype/pgtype.go
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@ -192,7 +192,8 @@ type Map struct {
reflectTypeToType map[reflect.Type]*Type
memoizedScanPlans map[uint32]map[reflect.Type][2]ScanPlan
memoizedScanPlans map[uint32]map[reflect.Type][2]ScanPlan
memoizedEncodePlans map[uint32]map[reflect.Type][2]EncodePlan
// TryWrapEncodePlanFuncs is a slice of functions that will wrap a value that cannot be encoded by the Codec. Every
// time a wrapper is found the PlanEncode method will be recursively called with the new value. This allows several layers of wrappers
@ -214,7 +215,8 @@ func NewMap() *Map {
reflectTypeToName: make(map[reflect.Type]string),
oidToFormatCode: make(map[uint32]int16),
memoizedScanPlans: make(map[uint32]map[reflect.Type][2]ScanPlan),
memoizedScanPlans: make(map[uint32]map[reflect.Type][2]ScanPlan),
memoizedEncodePlans: make(map[uint32]map[reflect.Type][2]EncodePlan),
TryWrapEncodePlanFuncs: []TryWrapEncodePlanFunc{
TryWrapDerefPointerEncodePlan,
@ -422,6 +424,9 @@ func (m *Map) RegisterType(t *Type) {
for k := range m.memoizedScanPlans {
delete(m.memoizedScanPlans, k)
}
for k := range m.memoizedEncodePlans {
delete(m.memoizedEncodePlans, k)
}
}
// RegisterDefaultPgType registers a mapping of a Go type to a PostgreSQL type name. Typically the data type to be
@ -435,6 +440,9 @@ func (m *Map) RegisterDefaultPgType(value any, name string) {
for k := range m.memoizedScanPlans {
delete(m.memoizedScanPlans, k)
}
for k := range m.memoizedEncodePlans {
delete(m.memoizedEncodePlans, k)
}
}
func (m *Map) TypeForOID(oid uint32) (*Type, bool) {
@ -1322,6 +1330,24 @@ func codecDecodeToTextFormat(codec Codec, m *Map, oid uint32, format int16, src
// PlanEncode returns an Encode plan for encoding value into PostgreSQL format for oid and format. If no plan can be
// found then nil is returned.
func (m *Map) PlanEncode(oid uint32, format int16, value any) EncodePlan {
oidMemo := m.memoizedEncodePlans[oid]
if oidMemo == nil {
oidMemo = make(map[reflect.Type][2]EncodePlan)
m.memoizedEncodePlans[oid] = oidMemo
}
targetReflectType := reflect.TypeOf(value)
typeMemo := oidMemo[targetReflectType]
plan := typeMemo[format]
if plan == nil {
plan = m.planEncode(oid, format, value)
typeMemo[format] = plan
oidMemo[targetReflectType] = typeMemo
}
return plan
}
func (m *Map) planEncode(oid uint32, format int16, value any) EncodePlan {
if format == TextFormatCode {
switch value.(type) {
case string: