github.com/dolthub/go-mysql-server@v0.18.0/sql/plan/showwarnings.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  	"github.com/dolthub/go-mysql-server/sql"
    19  	"github.com/dolthub/go-mysql-server/sql/types"
    20  )
    21  
    22  // ShowWarnings is a node that shows the session warnings
    23  type ShowWarnings []*sql.Warning
    24  
    25  var _ sql.Node = (*ShowWarnings)(nil)
    26  var _ sql.CollationCoercible = (*ShowWarnings)(nil)
    27  
    28  // Resolved implements sql.Node interface. The function always returns true.
    29  func (ShowWarnings) Resolved() bool {
    30  	return true
    31  }
    32  
    33  // WithChildren implements the Node interface.
    34  func (sw ShowWarnings) WithChildren(children ...sql.Node) (sql.Node, error) {
    35  	if len(children) != 0 {
    36  		return nil, sql.ErrInvalidChildrenNumber.New(sw, len(children), 0)
    37  	}
    38  
    39  	return sw, nil
    40  }
    41  
    42  // CheckPrivileges implements the interface sql.Node.
    43  func (sw ShowWarnings) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
    44  	return true
    45  }
    46  
    47  // CollationCoercibility implements the interface sql.CollationCoercible.
    48  func (ShowWarnings) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
    49  	return sql.Collation_binary, 7
    50  }
    51  
    52  // String implements the fmt.Stringer interface.
    53  func (ShowWarnings) String() string {
    54  	return "SHOW WARNINGS"
    55  }
    56  
    57  func (ShowWarnings) IsReadOnly() bool {
    58  	return true
    59  }
    60  
    61  // Schema returns a new Schema reference for "SHOW VARIABLES" query.
    62  func (ShowWarnings) Schema() sql.Schema {
    63  	return sql.Schema{
    64  		&sql.Column{Name: "Level", Type: types.LongText, Nullable: false},
    65  		&sql.Column{Name: "Code", Type: types.Int32, Nullable: true},
    66  		&sql.Column{Name: "Message", Type: types.LongText, Nullable: false},
    67  	}
    68  }
    69  
    70  // Children implements sql.Node interface. The function always returns nil.
    71  func (ShowWarnings) Children() []sql.Node { return nil }