mirror of
https://github.com/featurebasedb/featurebase.git
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bc450a91ea
* Thread context through sql3 DATABASE operations * Get rid of *most* of the context.Background() references
102 lines
2.2 KiB
Go
102 lines
2.2 KiB
Go
// Copyright 2023 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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// PlanOpDropView plan operator to drop a view.
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type PlanOpDropView struct {
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planner *ExecutionPlanner
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viewName string
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ifExists bool
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warnings []string
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}
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func NewPlanOpDropView(p *ExecutionPlanner, ifExists bool, viewName string) *PlanOpDropView {
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return &PlanOpDropView{
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planner: p,
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viewName: viewName,
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ifExists: ifExists,
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warnings: make([]string, 0),
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}
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}
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func (p *PlanOpDropView) 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["viewName"] = p.viewName
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result["isExists"] = p.ifExists
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return result
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}
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func (p *PlanOpDropView) String() string {
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return ""
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}
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func (p *PlanOpDropView) AddWarning(warning string) {
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p.warnings = append(p.warnings, warning)
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}
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func (p *PlanOpDropView) Warnings() []string {
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return p.warnings
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}
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func (p *PlanOpDropView) Schema() types.Schema {
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return types.Schema{}
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}
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func (p *PlanOpDropView) Children() []types.PlanOperator {
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return []types.PlanOperator{}
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}
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func (p *PlanOpDropView) Iterator(ctx context.Context, row types.Row) (types.RowIterator, error) {
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return &dropViewRowIter{
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planner: p.planner,
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ifExists: p.ifExists,
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viewName: p.viewName,
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}, nil
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}
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func (p *PlanOpDropView) WithChildren(children ...types.PlanOperator) (types.PlanOperator, error) {
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return nil, nil
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}
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type dropViewRowIter struct {
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planner *ExecutionPlanner
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ifExists bool
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viewName string
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}
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var _ types.RowIterator = (*dropViewRowIter)(nil)
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func (i *dropViewRowIter) Next(ctx context.Context) (types.Row, error) {
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err := i.planner.checkAccess(ctx, i.viewName, accessTypeDropObject)
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if err != nil {
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return nil, err
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}
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// check in the views table to see if it exists
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v, err := i.planner.getViewByName(ctx, i.viewName)
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if err != nil {
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return nil, err
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}
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if v == nil {
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if i.ifExists {
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return nil, types.ErrNoMoreRows
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}
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return nil, sql3.NewErrViewNotFound(0, 0, i.viewName)
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}
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err = i.planner.deleteView(ctx, i.viewName)
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if err != nil {
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return nil, err
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}
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return nil, types.ErrNoMoreRows
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}
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