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set.go
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set.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"
"strings"
"github.com/dolthub/go-mysql-server/sql"
)
// Set represents a set statement. This can be variables, but in some instances can also refer to row values.
type Set struct {
Exprs []sql.Expression
}
var _ sql.Node = (*Set)(nil)
var _ sql.CollationCoercible = (*Set)(nil)
// NewSet creates a new Set node.
func NewSet(vars []sql.Expression) *Set {
return &Set{Exprs: vars}
}
// Resolved implements the sql.Node interface.
func (s *Set) Resolved() bool {
for _, v := range s.Exprs {
if !v.Resolved() {
return false
}
}
return true
}
// Children implements the sql.Node interface.
func (s *Set) Children() []sql.Node { return nil }
func (s *Set) IsReadOnly() bool { return true }
// WithChildren implements the sql.Node interface.
func (s *Set) WithChildren(children ...sql.Node) (sql.Node, error) {
if len(children) != 0 {
return nil, sql.ErrInvalidChildrenNumber.New(s, len(children), 0)
}
return s, nil
}
// CheckPrivileges implements the interface sql.Node.
func (s *Set) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
//TODO: determine which variables cannot be set without a privilege check
return true
}
// CollationCoercibility implements the interface sql.CollationCoercible.
func (*Set) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
return sql.Collation_binary, 7
}
// WithExpressions implements the sql.Expressioner interface.
func (s *Set) WithExpressions(exprs ...sql.Expression) (sql.Node, error) {
if len(exprs) != len(s.Exprs) {
return nil, sql.ErrInvalidChildrenNumber.New(s, len(exprs), len(s.Exprs))
}
return NewSet(exprs), nil
}
// Expressions implements the sql.Expressioner interface.
func (s *Set) Expressions() []sql.Expression {
return s.Exprs
}
// Schema implements the sql.Node interface.
func (s *Set) Schema() sql.Schema {
return nil
}
func (s *Set) String() string {
var children = make([]string, len(s.Exprs))
for i, v := range s.Exprs {
children[i] = fmt.Sprintf(v.String())
}
return strings.Join(children, ", ")
}
func (s *Set) DebugString() string {
var children = make([]string, len(s.Exprs))
for i, v := range s.Exprs {
children[i] = fmt.Sprintf(sql.DebugString(v))
}
return strings.Join(children, ", ")
}