/
unresolved.go
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/
unresolved.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"
errors "gopkg.in/src-d/go-errors.v1"
"github.com/dolthub/go-mysql-server/sql"
)
// ErrUnresolvedTable is thrown when a table cannot be resolved
var ErrUnresolvedTable = errors.NewKind("unresolved table")
// UnresolvedTable is a table that has not been resolved yet but whose name is known.
type UnresolvedTable struct {
name string
database sql.Database
asOf sql.Expression
comment string
}
var _ sql.Node = (*UnresolvedTable)(nil)
var _ sql.Expressioner = (*UnresolvedTable)(nil)
var _ sql.UnresolvedTable = (*UnresolvedTable)(nil)
var _ sql.CollationCoercible = (*UnresolvedTable)(nil)
var _ Versionable = (*UnresolvedTable)(nil)
var _ sql.CommentedNode = (*UnresolvedTable)(nil)
// NewUnresolvedTable creates a new Unresolved table.
func NewUnresolvedTable(name, db string) *UnresolvedTable {
return &UnresolvedTable{name, sql.UnresolvedDatabase(db), nil, ""}
}
// NewUnresolvedTableWithDatabase creates a new Unresolved table with a database provided.
func NewUnresolvedTableWithDatabase(name string, db sql.Database) *UnresolvedTable {
return &UnresolvedTable{name, db, nil, ""}
}
// NewUnresolvedTableAsOf creates a new Unresolved table with an AS OF expression.
func NewUnresolvedTableAsOf(name, db string, asOf sql.Expression) *UnresolvedTable {
return &UnresolvedTable{name, sql.UnresolvedDatabase(db), asOf, ""}
}
// NewUnresolvedTableAsOfWithDatabase creates a new Unresolved table with an AS OF expression and the database provided.
func NewUnresolvedTableAsOfWithDatabase(name string, db sql.Database, asOf sql.Expression) *UnresolvedTable {
return &UnresolvedTable{name, db, asOf, ""}
}
func (t *UnresolvedTable) WithComment(s string) sql.Node {
ret := *t
ret.comment = s
return &ret
}
func (t *UnresolvedTable) Comment() string {
return t.comment
}
// Name implements the Nameable interface.
func (t *UnresolvedTable) Name() string {
return t.name
}
// Database implements sql.UnresolvedTable
func (t *UnresolvedTable) Database() sql.Database {
return t.database
}
// Resolved implements the Resolvable interface.
func (*UnresolvedTable) Resolved() bool {
return false
}
// Children implements the Node interface.
func (*UnresolvedTable) Children() []sql.Node { return nil }
// Schema implements the Node interface.
func (*UnresolvedTable) Schema() sql.Schema { return nil }
// RowIter implements the RowIter interface.
func (*UnresolvedTable) RowIter(ctx *sql.Context, row sql.Row) (sql.RowIter, error) {
return nil, ErrUnresolvedTable.New()
}
// WithChildren implements the Node interface.
func (t *UnresolvedTable) WithChildren(children ...sql.Node) (sql.Node, error) {
if len(children) != 0 {
return nil, sql.ErrInvalidChildrenNumber.New(t, len(children), 0)
}
return t, nil
}
// AsOf implements sql.UnresolvedTable
func (t *UnresolvedTable) AsOf() sql.Expression {
return t.asOf
}
// CheckPrivileges implements the interface sql.Node.
func (t *UnresolvedTable) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
subject := sql.PrivilegeCheckSubject{
Database: t.Database().Name(),
Table: t.name,
}
return opChecker.UserHasPrivileges(ctx,
sql.NewPrivilegedOperation(subject, sql.PrivilegeType_Select))
}
// CollationCoercibility implements the interface sql.CollationCoercible.
func (*UnresolvedTable) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
return sql.Collation_binary, 7
}
func (t *UnresolvedTable) IsReadOnly() bool {
return true
}
// WithAsOf implements sql.UnresolvedTable
func (t *UnresolvedTable) WithAsOf(asOf sql.Expression) (sql.Node, error) {
t2 := *t
t2.asOf = asOf
return &t2, nil
}
// WithDatabase returns a copy of this unresolved table with its Database field set to the given value. Analagous to
// WithChildren.
func (t *UnresolvedTable) WithDatabase(database string) (*UnresolvedTable, error) {
t2 := *t
t2.database = sql.UnresolvedDatabase(database)
return &t2, nil
}
func (t *UnresolvedTable) Expressions() []sql.Expression {
if t.asOf != nil {
return []sql.Expression{t.asOf}
}
return nil
}
func (t *UnresolvedTable) WithExpressions(expressions ...sql.Expression) (sql.Node, error) {
if t.asOf == nil {
if len(expressions) != 0 {
return nil, sql.ErrInvalidChildrenNumber.New(t, len(expressions), 0)
}
return t, nil
}
if len(expressions) != 1 {
return nil, sql.ErrInvalidChildrenNumber.New(t, len(expressions), 1)
}
return t.WithAsOf(expressions[0])
}
func (t UnresolvedTable) String() string {
return fmt.Sprintf("UnresolvedTable(%s)", t.name)
}
type DeferredAsOfTable struct {
*ResolvedTable
asOf sql.Expression
}
var _ sql.Node = (*DeferredAsOfTable)(nil)
var _ sql.Expressioner = (*DeferredAsOfTable)(nil)
var _ sql.UnresolvedTable = (*DeferredAsOfTable)(nil)
var _ sql.CollationCoercible = (*DeferredAsOfTable)(nil)
var _ Versionable = (*DeferredAsOfTable)(nil)
func NewDeferredAsOfTable(t *ResolvedTable, asOf sql.Expression) *DeferredAsOfTable {
if asOf == nil {
panic("Cannot create DeferredAsOfTable with nil asOf expression")
}
return &DeferredAsOfTable{
ResolvedTable: t,
asOf: asOf,
}
}
func (t *DeferredAsOfTable) Expressions() []sql.Expression {
return []sql.Expression{t.asOf}
}
func (t *DeferredAsOfTable) WithExpressions(expressions ...sql.Expression) (sql.Node, error) {
if t.asOf == nil {
if len(expressions) != 0 {
return nil, sql.ErrInvalidChildrenNumber.New(t, len(expressions), 0)
}
return t, nil
}
if len(expressions) != 1 {
return nil, sql.ErrInvalidChildrenNumber.New(t, len(expressions), 1)
}
return t.WithAsOf(expressions[0])
}
// Name implements the Nameable interface.
func (t *DeferredAsOfTable) Name() string {
return t.ResolvedTable.Name()
}
// Database implements sql.UnresolvedTable
func (t *DeferredAsOfTable) Database() sql.Database {
return t.ResolvedTable.SqlDatabase
}
// WithAsOf implements sql.UnresolvedTable
func (t *DeferredAsOfTable) WithAsOf(asOf sql.Expression) (sql.Node, error) {
t2 := *t
t2.asOf = asOf
return &t2, nil
}
// AsOf implements sql.UnresolvedTable
func (t *DeferredAsOfTable) AsOf() sql.Expression {
return t.asOf
}
func (t *DeferredAsOfTable) IsReadOnly() bool {
return true
}
type DeferredFilteredTable struct {
*ResolvedTable
}
var _ sql.Node = (*DeferredFilteredTable)(nil)
var _ sql.CollationCoercible = (*DeferredFilteredTable)(nil)
func NewDeferredFilteredTable(t *ResolvedTable) *DeferredFilteredTable {
return &DeferredFilteredTable{
ResolvedTable: t,
}
}