mirror of
https://github.com/featurebasedb/featurebase.git
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100 lines
2.5 KiB
Go
100 lines
2.5 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/pql"
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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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// TODO (pok) we should look at a drop and recreate, or an actual truncate PQL op
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// PlanOpPQLTruncateTable plan operator to delete rows from a table based on a single key.
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type PlanOpPQLTruncateTable struct {
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planner *ExecutionPlanner
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tableName string
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warnings []string
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}
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func NewPlanOpPQLTruncateTable(p *ExecutionPlanner, tableName string) *PlanOpPQLTruncateTable {
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return &PlanOpPQLTruncateTable{
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planner: p,
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tableName: tableName,
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warnings: make([]string, 0),
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}
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}
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func (p *PlanOpPQLTruncateTable) 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["tableName"] = p.tableName
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return result
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}
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func (p *PlanOpPQLTruncateTable) String() string {
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return ""
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}
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func (p *PlanOpPQLTruncateTable) AddWarning(warning string) {
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p.warnings = append(p.warnings, warning)
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}
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func (p *PlanOpPQLTruncateTable) Warnings() []string {
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return p.warnings
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}
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func (p *PlanOpPQLTruncateTable) Schema() types.Schema {
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return types.Schema{}
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}
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func (p *PlanOpPQLTruncateTable) Children() []types.PlanOperator {
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return []types.PlanOperator{}
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}
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func (p *PlanOpPQLTruncateTable) Iterator(ctx context.Context, row types.Row) (types.RowIterator, error) {
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return &truncateTableRowIter{
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planner: p.planner,
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tableName: p.tableName,
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}, nil
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}
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func (p *PlanOpPQLTruncateTable) WithChildren(children ...types.PlanOperator) (types.PlanOperator, error) {
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return p, nil
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}
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type truncateTableRowIter struct {
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planner *ExecutionPlanner
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tableName string
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}
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var _ types.RowIterator = (*truncateTableRowIter)(nil)
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func (i *truncateTableRowIter) Next(ctx context.Context) (types.Row, error) {
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err := i.planner.checkAccess(ctx, i.tableName, accessTypeWriteData)
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if err != nil {
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return nil, err
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}
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cond := &pql.Call{
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Name: "All",
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}
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call := &pql.Call{Name: "Delete", Children: []*pql.Call{cond}}
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tbl, err := i.planner.schemaAPI.TableByName(ctx, dax.TableName(i.tableName))
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if err != nil {
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return nil, sql3.NewErrTableNotFound(0, 0, i.tableName)
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}
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_, err = i.planner.executor.Execute(ctx, tbl, &pql.Query{Calls: []*pql.Call{call}}, nil, nil)
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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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