/
namedwindows.go
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/
namedwindows.go
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// Copyright 2022 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"
)
// NamedWindows is a list of WINDOW clause definitions
// to be resolved and merged into OVER clause sql.Window
// nodes.
type NamedWindows struct {
UnaryNode
WindowDefs map[string]*sql.WindowDefinition
}
var _ sql.Node = (*NamedWindows)(nil)
var _ sql.CollationCoercible = (*NamedWindows)(nil)
func NewNamedWindows(windowDefs map[string]*sql.WindowDefinition, child sql.Node) *NamedWindows {
return &NamedWindows{
UnaryNode: UnaryNode{Child: child},
WindowDefs: windowDefs,
}
}
func (n *NamedWindows) IsReadOnly() bool {
return n.Child.IsReadOnly()
}
// String implements sql.Node
func (n *NamedWindows) String() string {
var sb strings.Builder
sb.WriteString("NamedWindows(")
var sep string
for n, def := range n.WindowDefs {
sb.WriteString(strings.ReplaceAll(fmt.Sprintf("%s%s %s", sep, n, def), "over", "as"))
sep = ", "
}
pr := sql.NewTreePrinter()
sb.WriteString(")")
_ = pr.WriteNode(sb.String())
_ = pr.WriteChildren(n.Child.String())
return pr.String()
}
// DebugString implements sql.Node
func (n *NamedWindows) DebugString() string {
var sb strings.Builder
sb.WriteString("NamedWindows(")
var sep string
for n, def := range n.WindowDefs {
sb.WriteString(strings.ReplaceAll(fmt.Sprintf("%s%s %s", sep, n, def.DebugString()), "over", "as"))
sep = ", "
}
pr := sql.NewTreePrinter()
sb.WriteString(")")
_ = pr.WriteNode(sb.String())
_ = pr.WriteChildren(sql.DebugString(n.Child))
return pr.String()
}
// RowIter implements sql.Node
func (n *NamedWindows) RowIter(ctx *sql.Context, row sql.Row) (sql.RowIter, error) {
panic("cannot iterate *plan.NamedWindows")
}
// WithChildren implements sql.Node
func (n *NamedWindows) WithChildren(nodes ...sql.Node) (sql.Node, error) {
if len(nodes) != 1 {
return nil, sql.ErrInvalidChildrenNumber.New(n, len(nodes), 1)
}
return NewNamedWindows(n.WindowDefs, nodes[0]), nil
}
// CheckPrivileges implements sql.Node
func (n *NamedWindows) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
return n.Child.CheckPrivileges(ctx, opChecker)
}
// CollationCoercibility implements the interface sql.CollationCoercible.
func (n *NamedWindows) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
return sql.GetCoercibility(ctx, n.Child)
}