39 lines
963 B
Go
39 lines
963 B
Go
// Copyright 2016 PingCAP, 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,
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package executor
|
|
|
|
// ExplainExec represents an explain executor.
|
|
type ExplainExec struct {
|
|
baseExecutor
|
|
|
|
rows []Row
|
|
cursor int
|
|
}
|
|
|
|
// Next implements Execution Next interface.
|
|
func (e *ExplainExec) Next() (Row, error) {
|
|
if e.cursor >= len(e.rows) {
|
|
return nil, nil
|
|
}
|
|
row := e.rows[e.cursor]
|
|
e.cursor++
|
|
return row, nil
|
|
}
|
|
|
|
// Close implements the Executor Close interface.
|
|
func (e *ExplainExec) Close() error {
|
|
e.rows = nil
|
|
return nil
|
|
}
|