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show_tables.go
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show_tables.go
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// Copyright 2020-2021 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package plan
import (
"fmt"
"github.com/dolthub/go-mysql-server/sql/types"
"github.com/dolthub/go-mysql-server/sql"
"github.com/dolthub/go-mysql-server/sql/expression"
)
// ShowTables is a node that shows the database tables.
type ShowTables struct {
db sql.Database
Full bool
asOf sql.Expression
}
// NewShowTables creates a new show tables node given a database.
func NewShowTables(database sql.Database, full bool, asOf sql.Expression) *ShowTables {
return &ShowTables{
db: database,
Full: full,
asOf: asOf,
}
}
var _ sql.Databaser = (*ShowTables)(nil)
var _ sql.Expressioner = (*ShowTables)(nil)
var _ sql.CollationCoercible = (*ShowTables)(nil)
var _ Versionable = (*ShowTables)(nil)
// Database implements the sql.Databaser interface.
func (p *ShowTables) Database() sql.Database {
return p.db
}
func (p *ShowTables) IsReadOnly() bool {
return true
}
// WithDatabase implements the sql.Databaser interface.
func (p *ShowTables) WithDatabase(db sql.Database) (sql.Node, error) {
nc := *p
nc.db = db
return &nc, nil
}
// Resolved implements the Resolvable interface.
func (p *ShowTables) Resolved() bool {
_, ok := p.db.(sql.UnresolvedDatabase)
return !ok && expression.ExpressionsResolved(p.Expressions()...)
}
// Children implements the Node interface.
func (*ShowTables) Children() []sql.Node {
return nil
}
// Schema implements the Node interface.
func (p *ShowTables) Schema() sql.Schema {
var sch sql.Schema
colName := fmt.Sprintf("Tables_in_%s", p.Database().Name())
sch = sql.Schema{
{Name: colName, Type: types.LongText},
}
if p.Full {
sch = append(sch, &sql.Column{Name: "Table_type", Type: types.LongText})
}
return sch
}
// WithAsOf implements the Versionable interface.
func (p *ShowTables) WithAsOf(asOf sql.Expression) (sql.Node, error) {
np := *p
np.asOf = asOf
return &np, nil
}
// AsOf implements the Versionable interface.
func (p *ShowTables) AsOf() sql.Expression {
return p.asOf
}
// WithChildren implements the Node interface.
func (p *ShowTables) WithChildren(children ...sql.Node) (sql.Node, error) {
if len(children) != 0 {
return nil, sql.ErrInvalidChildrenNumber.New(p, len(children), 0)
}
return p, nil
}
// CheckPrivileges implements the interface sql.Node.
func (p *ShowTables) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
// Some tables won't be visible during the resolution step if the user doesn't have the correct privileges
return true
}
// CollationCoercibility implements the interface sql.CollationCoercible.
func (*ShowTables) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
return sql.Collation_binary, 7
}
func (p ShowTables) String() string {
return "ShowTables"
}
// Expressions implements sql.Expressioner
func (p *ShowTables) Expressions() []sql.Expression {
if p.asOf == nil {
return nil
}
return []sql.Expression{p.asOf}
}
// WithExpressions implements sql.Expressioner
func (p *ShowTables) WithExpressions(exprs ...sql.Expression) (sql.Node, error) {
if len(exprs) != 1 {
return nil, sql.ErrInvalidChildrenNumber.New(p, len(exprs), 1)
}
np := *p
np.asOf = exprs[0]
return &np, nil
}