github.com/dolthub/go-mysql-server@v0.18.0/sql/plan/releaser.go (about)

     1  // Copyright 2020-2021 Dolthub, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package plan
    16  
    17  import (
    18  	"reflect"
    19  
    20  	"github.com/dolthub/go-mysql-server/sql"
    21  )
    22  
    23  type Releaser struct {
    24  	Child   sql.Node
    25  	Release func()
    26  }
    27  
    28  var _ sql.Node = (*Releaser)(nil)
    29  var _ sql.CollationCoercible = (*Releaser)(nil)
    30  
    31  func (r *Releaser) Resolved() bool {
    32  	return r.Child.Resolved()
    33  }
    34  
    35  func (r *Releaser) IsReadOnly() bool {
    36  	return r.Child.IsReadOnly()
    37  }
    38  
    39  func (r *Releaser) Children() []sql.Node {
    40  	return []sql.Node{r.Child}
    41  }
    42  
    43  func (r *Releaser) Schema() sql.Schema {
    44  	return r.Child.Schema()
    45  }
    46  
    47  func (r *Releaser) WithChildren(children ...sql.Node) (sql.Node, error) {
    48  	if len(children) != 1 {
    49  		return nil, sql.ErrInvalidChildrenNumber.New(r, len(children), 1)
    50  	}
    51  	return &Releaser{children[0], r.Release}, nil
    52  }
    53  
    54  // CheckPrivileges implements the interface sql.Node.
    55  func (r *Releaser) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
    56  	return r.Child.CheckPrivileges(ctx, opChecker)
    57  }
    58  
    59  // CollationCoercibility implements the interface sql.CollationCoercible.
    60  func (r *Releaser) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
    61  	return sql.GetCoercibility(ctx, r.Child)
    62  }
    63  
    64  func (r *Releaser) String() string {
    65  	return r.Child.String()
    66  }
    67  
    68  func (r *Releaser) Equal(n sql.Node) bool {
    69  	if r2, ok := n.(*Releaser); ok {
    70  		return reflect.DeepEqual(r.Child, r2.Child)
    71  	}
    72  	return false
    73  }