forked from dolthub/go-mysql-server
/
values.go
173 lines (148 loc) · 3.83 KB
/
values.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 (
"strings"
"github.com/Sndav/go-mysql-server/sql"
"github.com/Sndav/go-mysql-server/sql/expression"
)
// Values represents a set of tuples of expressions.
type Values struct {
ExpressionTuples [][]sql.Expression
}
// NewValues creates a Values node with the given tuples.
func NewValues(tuples [][]sql.Expression) *Values {
return &Values{tuples}
}
// Schema implements the Node interface.
func (p *Values) Schema() sql.Schema {
if len(p.ExpressionTuples) == 0 {
return nil
}
exprs := p.ExpressionTuples[0]
s := make(sql.Schema, len(exprs))
for i, e := range exprs {
var name string
if n, ok := e.(sql.Nameable); ok {
name = n.Name()
} else {
name = e.String()
}
s[i] = &sql.Column{
Name: name,
Type: e.Type(),
Nullable: e.IsNullable(),
}
}
return s
}
// Children implements the Node interface.
func (p *Values) Children() []sql.Node {
return nil
}
// Resolved implements the Resolvable interface.
func (p *Values) Resolved() bool {
for _, et := range p.ExpressionTuples {
if !expression.ExpressionsResolved(et...) {
return false
}
}
return true
}
// RowIter implements the Node interface.
func (p *Values) RowIter(ctx *sql.Context, row sql.Row) (sql.RowIter, error) {
rows := make([]sql.Row, len(p.ExpressionTuples))
for i, et := range p.ExpressionTuples {
vals := make([]interface{}, len(et))
for j, e := range et {
var err error
vals[j], err = e.Eval(ctx, row)
if err != nil {
return nil, err
}
}
rows[i] = sql.NewRow(vals...)
}
return sql.RowsToRowIter(rows...), nil
}
func (p *Values) String() string {
var sb strings.Builder
sb.WriteString("Values(")
for i, tuple := range p.ExpressionTuples {
if i > 0 {
sb.WriteString(",\n")
}
for j, e := range tuple {
if j > 0 {
sb.WriteString(",")
}
sb.WriteString(e.String())
}
}
sb.WriteString(")")
return sb.String()
}
func (p *Values) DebugString() string {
var sb strings.Builder
sb.WriteString("Values(")
for i, tuple := range p.ExpressionTuples {
if i > 0 {
sb.WriteString(",\n")
}
sb.WriteRune('[')
for j, e := range tuple {
if j > 0 {
sb.WriteString(",")
}
sb.WriteString(sql.DebugString(e))
}
sb.WriteRune(']')
}
sb.WriteString(")")
return sb.String()
}
// Expressions implements the Expressioner interface.
func (p *Values) Expressions() []sql.Expression {
var exprs []sql.Expression
for _, tuple := range p.ExpressionTuples {
exprs = append(exprs, tuple...)
}
return exprs
}
// WithChildren implements the Node interface.
func (p *Values) WithChildren(children ...sql.Node) (sql.Node, error) {
if len(children) != 0 {
return nil, sql.ErrInvalidChildrenNumber.New(p, len(children), 0)
}
return p, nil
}
// WithExpressions implements the Expressioner interface.
func (p *Values) WithExpressions(exprs ...sql.Expression) (sql.Node, error) {
var expected int
for _, t := range p.ExpressionTuples {
expected += len(t)
}
if len(exprs) != expected {
return nil, sql.ErrInvalidChildrenNumber.New(p, len(exprs), expected)
}
var offset int
var tuples = make([][]sql.Expression, len(p.ExpressionTuples))
for i, t := range p.ExpressionTuples {
for range t {
tuples[i] = append(tuples[i], exprs[offset])
offset++
}
}
return NewValues(tuples), nil
}