mirror of
https://github.com/featurebasedb/featurebase.git
synced 2026-09-06 16:45:55 +00:00
95 lines
2.4 KiB
Go
95 lines
2.4 KiB
Go
// Copyright 2022 Molecula Corp. All rights reserved.
|
|
|
|
package planner
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
|
|
"github.com/molecula/featurebase/v3/sql3"
|
|
"github.com/molecula/featurebase/v3/sql3/planner/types"
|
|
)
|
|
|
|
// PlanOpHaving is a filter operator for the HAVING clause
|
|
type PlanOpHaving struct {
|
|
planner *ExecutionPlanner
|
|
ChildOp types.PlanOperator
|
|
Predicate types.PlanExpression
|
|
|
|
warnings []string
|
|
}
|
|
|
|
func NewPlanOpHaving(planner *ExecutionPlanner, predicate types.PlanExpression, child types.PlanOperator) *PlanOpHaving {
|
|
return &PlanOpHaving{
|
|
planner: planner,
|
|
Predicate: predicate,
|
|
ChildOp: child,
|
|
warnings: make([]string, 0),
|
|
}
|
|
}
|
|
|
|
func (p *PlanOpHaving) Schema() types.Schema {
|
|
return p.ChildOp.Schema()
|
|
}
|
|
|
|
func (p *PlanOpHaving) Iterator(ctx context.Context, row types.Row) (types.RowIterator, error) {
|
|
i, err := p.ChildOp.Iterator(ctx, row)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return newFilterIterator(ctx, p.Predicate, i), nil
|
|
}
|
|
|
|
func (p *PlanOpHaving) WithChildren(children ...types.PlanOperator) (types.PlanOperator, error) {
|
|
if len(children) != 1 {
|
|
return nil, sql3.NewErrInternalf("unexpected number of children '%d'", len(children))
|
|
}
|
|
return NewPlanOpHaving(p.planner, p.Predicate, children[0]), nil
|
|
}
|
|
|
|
func (p *PlanOpHaving) Children() []types.PlanOperator {
|
|
return []types.PlanOperator{
|
|
p.ChildOp,
|
|
}
|
|
}
|
|
|
|
func (p *PlanOpHaving) Plan() map[string]interface{} {
|
|
result := make(map[string]interface{})
|
|
result["_op"] = fmt.Sprintf("%T", p)
|
|
ps := make([]string, 0)
|
|
for _, e := range p.Schema() {
|
|
ps = append(ps, fmt.Sprintf("'%s', '%s', '%s'", e.ColumnName, e.RelationName, e.Type.TypeDescription()))
|
|
}
|
|
result["_schema"] = ps
|
|
result["predicate"] = p.Predicate.Plan()
|
|
result["child"] = p.ChildOp.Plan()
|
|
return result
|
|
}
|
|
|
|
func (p *PlanOpHaving) String() string {
|
|
return ""
|
|
}
|
|
|
|
func (p *PlanOpHaving) AddWarning(warning string) {
|
|
p.warnings = append(p.warnings, warning)
|
|
}
|
|
|
|
func (p *PlanOpHaving) Warnings() []string {
|
|
return p.warnings
|
|
}
|
|
|
|
func (p *PlanOpHaving) Expressions() []types.PlanExpression {
|
|
if p.Predicate != nil {
|
|
return []types.PlanExpression{
|
|
p.Predicate,
|
|
}
|
|
}
|
|
return []types.PlanExpression{}
|
|
}
|
|
|
|
func (p *PlanOpHaving) WithUpdatedExpressions(exprs ...types.PlanExpression) (types.PlanOperator, error) {
|
|
if len(exprs) != 1 {
|
|
return nil, sql3.NewErrInternalf("unexpected number of exprs '%d'", len(exprs))
|
|
}
|
|
return NewPlanOpHaving(p.planner, exprs[0], p.ChildOp), nil
|
|
}
|