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