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87011e4294
* Refactor CLI to mimic psql's meta-commands
This PR adds support for meta-commands (also known as "backslash
commands") like those in psql, Postgres's CLI. Only a few meta-commands
are currently implemented, but this was meant to demonstrate how we
could use something like `\i file.csv` to insert local files into SQL
statements.
* Meta-commands: \file and \include
The initial implementation used `\i` as a streaming file handle.
This commit changes that to `\file`, and then implements `\i` (or
`\include`) as handling multiple sql commands.
* Add meta-command "help" (\?)
This is basically a copy of the psql help output, but includes only
those options we currently support.
* Add support for \o [file], and \timing
The \o meta-command writes query output to a file.
The \timing meta-command turns on/off the timing display sent to stdout.
* Add meta-commands: \l (show databases) and \dt (show tables)
* Add meta-command: \watch [period]
* Update meta-command \connect to take database name instead of ID
* Add support for \echo, \qecho, and \warn
This commit contains an known issue in that the `-n` option will exclude
the line feed, but if the output is the terminal, the readline package
clobbers any content on the current line (i.e. anything without a line
feed). That will need to be addressed at some point.
* Add support for \w [FILE] (write query buffer to file)
* Add SchemaAPI no-op implementation
* Refactor query handler to align with /sql and /databases endpoints
We want to standardize on:
/sql
/databases/{databaseID}/sql
* Add CLI support for expanded, border, tuples_only (and pset)
* Add help text for \pset and \t
105 lines
2.6 KiB
Go
105 lines
2.6 KiB
Go
// Copyright 2021 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/parser"
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"github.com/featurebasedb/featurebase/v3/sql3/planner/types"
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)
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// PlanOpAlterDatabase plan operator to alter a database.
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type PlanOpAlterDatabase struct {
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planner *ExecutionPlanner
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database *dax.Database
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operation alterOperation
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option parser.DatabaseOption
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warnings []string
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}
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func NewPlanOpAlterDatabase(p *ExecutionPlanner, db *dax.Database, operation alterOperation, option parser.DatabaseOption) *PlanOpAlterDatabase {
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return &PlanOpAlterDatabase{
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planner: p,
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database: db,
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operation: operation,
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option: option,
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warnings: make([]string, 0),
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}
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}
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func (p *PlanOpAlterDatabase) 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["databaseName"] = p.database.Name
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result["operation"] = p.operation
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result["option"] = p.option
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return result
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}
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func (p *PlanOpAlterDatabase) AddWarning(warning string) {
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p.warnings = append(p.warnings, warning)
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}
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func (p *PlanOpAlterDatabase) Warnings() []string {
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return p.warnings
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}
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func (p *PlanOpAlterDatabase) String() string {
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return ""
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}
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func (p *PlanOpAlterDatabase) Schema() types.Schema {
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return types.Schema{}
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}
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func (p *PlanOpAlterDatabase) Children() []types.PlanOperator {
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return []types.PlanOperator{}
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}
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func (p *PlanOpAlterDatabase) Iterator(ctx context.Context, row types.Row) (types.RowIterator, error) {
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return &alterDatabaseRowIter{
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planner: p.planner,
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database: p.database,
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operation: p.operation,
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option: p.option,
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}, nil
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}
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func (p *PlanOpAlterDatabase) WithChildren(children ...types.PlanOperator) (types.PlanOperator, error) {
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return nil, nil
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}
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type alterDatabaseRowIter struct {
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planner *ExecutionPlanner
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database *dax.Database
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operation alterOperation
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option parser.DatabaseOption
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}
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var _ types.RowIterator = (*alterDatabaseRowIter)(nil)
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func (i *alterDatabaseRowIter) Next(ctx context.Context) (types.Row, error) {
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switch i.operation {
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case alterOpSet:
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var optName string
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var optValue string
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switch v := i.option.(type) {
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case *parser.UnitsOption:
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e := v.Expr.(*parser.IntegerLit)
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optName = dax.DatabaseOptionWorkersMin
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optValue = e.Value
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default:
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return nil, sql3.NewErrInvalidDatabaseOption(0, 0, i.option.String())
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}
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if err := i.planner.schemaAPI.SetDatabaseOption(ctx, i.database.ID, optName, optValue); err != nil {
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return nil, err
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}
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}
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return nil, types.ErrNoMoreRows
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}
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