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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
120 lines
3 KiB
Go
120 lines
3 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/dax"
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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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// PlanOpCreateView implements the CREATE VIEW operator
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type PlanOpCreateView struct {
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planner *ExecutionPlanner
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view *viewSystemObject
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ifNotExists bool
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warnings []string
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}
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func NewPlanOpCreateView(planner *ExecutionPlanner, ifNotExists bool, view *viewSystemObject) *PlanOpCreateView {
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return &PlanOpCreateView{
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planner: planner,
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view: view,
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ifNotExists: ifNotExists,
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warnings: make([]string, 0),
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}
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}
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func (p *PlanOpCreateView) Schema() types.Schema {
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return types.Schema{}
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}
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func (p *PlanOpCreateView) Iterator(ctx context.Context, row types.Row) (types.RowIterator, error) {
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return newCreateViewIter(p.planner, p.ifNotExists, p.view), nil
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}
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func (p *PlanOpCreateView) Children() []types.PlanOperator {
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return []types.PlanOperator{}
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}
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func (p *PlanOpCreateView) WithChildren(children ...types.PlanOperator) (types.PlanOperator, error) {
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if len(children) != 0 {
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return nil, sql3.NewErrInternalf("unexpected number of children '%d'", len(children))
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}
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return NewPlanOpCreateView(p.planner, p.ifNotExists, p.view), nil
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}
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func (p *PlanOpCreateView) 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["model"] = p.view.name
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return result
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}
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func (p *PlanOpCreateView) String() string {
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return ""
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}
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func (p *PlanOpCreateView) AddWarning(warning string) {
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p.warnings = append(p.warnings, warning)
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}
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func (p *PlanOpCreateView) Warnings() []string {
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var w []string
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w = append(w, p.warnings...)
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return w
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}
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type createViewIter struct {
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planner *ExecutionPlanner
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view *viewSystemObject
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ifNotExists bool
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}
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func newCreateViewIter(planner *ExecutionPlanner, ifNotExists bool, view *viewSystemObject) *createViewIter {
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return &createViewIter{
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planner: planner,
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view: view,
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ifNotExists: ifNotExists,
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}
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}
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func (i *createViewIter) Next(ctx context.Context) (types.Row, error) {
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// make sure we have no existing table named the same as our view
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viewName := dax.TableName(i.view.name)
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tbl, err := i.planner.schemaAPI.TableByName(ctx, viewName)
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if err != nil {
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if !isTableNotFoundError(err) {
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return nil, err
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}
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}
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if tbl != nil {
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if i.ifNotExists {
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return nil, types.ErrNoMoreRows
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}
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return nil, sql3.NewErrViewExists(0, 0, i.view.name)
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}
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// now check in the views table to see if it is exists
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v, err := i.planner.getViewByName(ctx, i.view.name)
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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.ifNotExists {
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return nil, types.ErrNoMoreRows
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}
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return nil, sql3.NewErrViewExists(0, 0, i.view.name)
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}
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// now store the view into fb_views
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err = i.planner.insertView(ctx, i.view)
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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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