/
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 expression
import (
"fmt"
"strings"
"gopkg.in/src-d/go-errors.v1"
"github.com/dolthub/go-mysql-server/sql"
)
// UnresolvedColumn is an expression of a column that is not yet resolved.
// This is a placeholder node, so its methods Type, IsNullable and Eval are not
// supposed to be called.
type UnresolvedColumn struct {
name string
table string
}
var _ sql.Expression = (*UnresolvedColumn)(nil)
var _ sql.Expression2 = (*UnresolvedColumn)(nil)
var _ sql.CollationCoercible = (*UnresolvedColumn)(nil)
// NewUnresolvedColumn creates a new UnresolvedColumn expression.
func NewUnresolvedColumn(name string) *UnresolvedColumn {
return &UnresolvedColumn{name: name}
}
// NewUnresolvedQualifiedColumn creates a new UnresolvedColumn expression
// with a table qualifier.
func NewUnresolvedQualifiedColumn(table, name string) *UnresolvedColumn {
return &UnresolvedColumn{name: name, table: table}
}
// Children implements the Expression interface.
func (*UnresolvedColumn) Children() []sql.Expression {
return nil
}
// Resolved implements the Expression interface.
func (*UnresolvedColumn) Resolved() bool {
return false
}
// IsNullable implements the Expression interface.
func (*UnresolvedColumn) IsNullable() bool {
panic("unresolved column is a placeholder node, but IsNullable was called")
}
// Type implements the Expression interface.
func (*UnresolvedColumn) Type() sql.Type {
panic("unresolved column is a placeholder node, but Type was called")
}
// CollationCoercibility implements the interface sql.CollationCoercible.
func (*UnresolvedColumn) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
return sql.Collation_binary, 7
}
func (uc *UnresolvedColumn) Eval2(ctx *sql.Context, row sql.Row2) (sql.Value, error) {
panic("unresolved column is a placeholder node, but Eval2 was called")
}
func (uc *UnresolvedColumn) Type2() sql.Type2 {
panic("unresolved column is a placeholder node, but Type2 was called")
}
// Name implements the Nameable interface.
func (uc *UnresolvedColumn) Name() string { return uc.name }
// Table returns the table name.
func (uc *UnresolvedColumn) Table() string { return uc.table }
func (uc *UnresolvedColumn) String() string {
if uc.table == "" {
return uc.name
}
return fmt.Sprintf("%s.%s", uc.table, uc.name)
}
// Eval implements the Expression interface.
func (*UnresolvedColumn) Eval(ctx *sql.Context, r sql.Row) (interface{}, error) {
panic("unresolved column is a placeholder node, but Eval was called")
}
// WithChildren implements the Expression interface.
func (uc *UnresolvedColumn) WithChildren(children ...sql.Expression) (sql.Expression, error) {
if len(children) != 0 {
return nil, sql.ErrInvalidChildrenNumber.New(uc, len(children), 0)
}
return uc, nil
}
// ErrUnresolvedTableFunction is thrown when a table function cannot be resolved
var ErrUnresolvedTableFunction = errors.NewKind("unresolved table function")
var _ sql.TableFunction = (*UnresolvedTableFunction)(nil)
// UnresolvedTableFunction represents a table function that is not yet resolved.
// This is a placeholder node, so methods such as Schema, RowIter, etc, are not
// intended to be used.
type UnresolvedTableFunction struct {
name string
Alias string
Arguments []sql.Expression
database sql.Database
}
var _ sql.Node = (*UnresolvedTableFunction)(nil)
var _ sql.CollationCoercible = (*UnresolvedTableFunction)(nil)
var _ sql.RenameableNode = (*UnresolvedTableFunction)(nil)
// NewUnresolvedTableFunction creates a new UnresolvedTableFunction node for a sql plan.
func NewUnresolvedTableFunction(name string, arguments []sql.Expression) *UnresolvedTableFunction {
return &UnresolvedTableFunction{
name: name,
Arguments: arguments,
}
}
func (utf *UnresolvedTableFunction) WithName(s string) sql.Node {
ret := *utf
ret.name = s
return &ret
}
// NewInstance implements the TableFunction interface
func (utf *UnresolvedTableFunction) NewInstance(_ *sql.Context, _ sql.Database, _ []sql.Expression) (sql.Node, error) {
return nil, ErrUnresolvedTableFunction.New()
}
// Database implements the Databaser interface
func (utf *UnresolvedTableFunction) Database() sql.Database {
return utf.database
}
// WithDatabase implements the Databaser interface
func (utf *UnresolvedTableFunction) WithDatabase(database sql.Database) (sql.Node, error) {
utf.database = database
return utf, nil
}
// Name implements the TableFunction interface
func (utf *UnresolvedTableFunction) Name() string {
return utf.name
}
// Expressions implements the Expressioner interface
func (utf *UnresolvedTableFunction) Expressions() []sql.Expression {
return utf.Arguments
}
func (utf *UnresolvedTableFunction) IsReadOnly() bool {
return true
}
// WithExpressions implements the Expressioner interface
func (utf *UnresolvedTableFunction) WithExpressions(expression ...sql.Expression) (sql.Node, error) {
if len(expression) != len(utf.Expressions()) {
return nil, sql.ErrInvalidExpressionNumber.New(utf, len(expression), len(utf.Expressions()))
}
nutf := *utf
nutf.Arguments = make([]sql.Expression, len(expression))
for i, _ := range expression {
nutf.Arguments[i] = expression[i]
}
return &nutf, nil
}
// Schema implements the Node interface
func (utf *UnresolvedTableFunction) Schema() sql.Schema {
return nil
}
// Children implements the Node interface
func (utf *UnresolvedTableFunction) Children() []sql.Node {
return nil
}
// RowIter implements the Node interface
func (utf *UnresolvedTableFunction) RowIter(ctx *sql.Context, row sql.Row) (sql.RowIter, error) {
return nil, ErrUnresolvedTableFunction.New()
}
// WithChildren implements the Node interface
func (utf *UnresolvedTableFunction) WithChildren(node ...sql.Node) (sql.Node, error) {
panic("no expected children for unresolved table function")
}
// CheckPrivileges implements the Node interface
func (utf UnresolvedTableFunction) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
panic("attempting to check privileges on an unresolved table function")
return false
}
// CollationCoercibility implements the interface sql.CollationCoercible.
func (UnresolvedTableFunction) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
return sql.Collation_binary, 7
}
// Resolved implements the Resolvable interface
func (utf *UnresolvedTableFunction) Resolved() bool {
return false
}
// String implements the Stringer interface
func (utf *UnresolvedTableFunction) String() string {
var exprs = make([]string, len(utf.Arguments))
for i, e := range utf.Arguments {
exprs[i] = e.String()
}
return fmt.Sprintf("%s(%s)", utf.name, strings.Join(exprs, ", "))
}
var _ sql.Expression = (*UnresolvedFunction)(nil)
var _ sql.CollationCoercible = (*UnresolvedFunction)(nil)
// UnresolvedFunction represents a function that is not yet resolved.
// This is a placeholder node, so its methods Type, IsNullable and Eval are not
// supposed to be called.
type UnresolvedFunction struct {
name string
// IsAggregate or not.
IsAggregate bool
// Window is the window for this function, if present
Window *sql.WindowDefinition
// Children of the expression.
Arguments []sql.Expression
}
// NewUnresolvedFunction creates a new UnresolvedFunction expression.
func NewUnresolvedFunction(
name string,
agg bool,
window *sql.WindowDefinition,
arguments ...sql.Expression,
) *UnresolvedFunction {
return &UnresolvedFunction{
name: name,
IsAggregate: agg,
Window: window,
Arguments: arguments,
}
}
// Children implements the Expression interface.
func (uf *UnresolvedFunction) Children() []sql.Expression {
return append(uf.Arguments, uf.Window.ToExpressions()...)
}
// WithWindow implements the Expression interface.
func (uf *UnresolvedFunction) WithWindow(def *sql.WindowDefinition) *UnresolvedFunction {
nf := *uf
nf.Window = def
return &nf
}
// Resolved implements the Expression interface.
func (*UnresolvedFunction) Resolved() bool {
return false
}
// IsNullable implements the Expression interface.
func (*UnresolvedFunction) IsNullable() bool {
panic("unresolved function is a placeholder node, but IsNullable was called")
}
// Type implements the Expression interface.
func (*UnresolvedFunction) Type() sql.Type {
panic("unresolved function is a placeholder node, but Type was called")
}
// CollationCoercibility implements the interface sql.CollationCoercible.
func (*UnresolvedFunction) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
return sql.Collation_binary, 7
}
// Name implements the Nameable interface.
func (uf *UnresolvedFunction) Name() string { return uf.name }
func (uf *UnresolvedFunction) String() string {
var exprs = make([]string, len(uf.Arguments))
for i, e := range uf.Arguments {
exprs[i] = e.String()
}
over := ""
if uf.Window != nil {
over = fmt.Sprintf(" %s", uf.Window)
}
return fmt.Sprintf("%s(%s)%s", uf.name, strings.Join(exprs, ", "), over)
}
func (uf *UnresolvedFunction) DebugString() string {
var exprs = make([]string, len(uf.Arguments))
for i, e := range uf.Arguments {
exprs[i] = sql.DebugString(e)
}
over := ""
if uf.Window != nil {
over = fmt.Sprintf(" %s", sql.DebugString(uf.Window))
}
return fmt.Sprintf("(unresolved)%s(%s)%s", uf.name, strings.Join(exprs, ", "), over)
}
// Eval implements the Expression interface.
func (*UnresolvedFunction) Eval(ctx *sql.Context, r sql.Row) (interface{}, error) {
panic("unresolved function is a placeholder node, but Eval was called")
}
// WithChildren implements the Expression interface.
func (uf *UnresolvedFunction) WithChildren(children ...sql.Expression) (sql.Expression, error) {
if len(children) != len(uf.Arguments)+len(uf.Window.ToExpressions()) {
return nil, sql.ErrInvalidChildrenNumber.New(uf, len(children), len(uf.Arguments)+len(uf.Window.ToExpressions()))
}
window, err := uf.Window.FromExpressions(children[len(uf.Arguments):])
if err != nil {
return nil, err
}
return NewUnresolvedFunction(uf.name, uf.IsAggregate, window, children[:len(uf.Arguments)]...), nil
}