github.com/dolthub/go-mysql-server@v0.18.0/memory/index_driver.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 memory
    16  
    17  import (
    18  	"github.com/dolthub/go-mysql-server/sql"
    19  )
    20  
    21  const IndexDriverId = "MemoryIndexDriver"
    22  
    23  // TestIndexDriver is a non-performant index driver meant to aid in verification of engine correctness. It can not
    24  // create or delete indexes, but will use the index types defined in this package to alter how queries are executed,
    25  // retrieving values from the indexes rather than from the tables directly.
    26  type TestIndexDriver struct {
    27  	db      string
    28  	indexes map[string][]sql.DriverIndex
    29  }
    30  
    31  // NewIndexDriver returns a new index driver for database and the indexes given, keyed by the table name.
    32  func NewIndexDriver(db string, indexes map[string][]sql.DriverIndex) *TestIndexDriver {
    33  	return &TestIndexDriver{db: db, indexes: indexes}
    34  }
    35  
    36  func (d *TestIndexDriver) ID() string {
    37  	return IndexDriverId
    38  }
    39  
    40  func (d *TestIndexDriver) LoadAll(ctx *sql.Context, db, table string) ([]sql.DriverIndex, error) {
    41  	if d.db != db {
    42  		return nil, nil
    43  	}
    44  	return d.indexes[table], nil
    45  }
    46  
    47  func (d *TestIndexDriver) Save(*sql.Context, sql.DriverIndex, sql.PartitionIndexKeyValueIter) error {
    48  	panic("not implemented")
    49  }
    50  
    51  func (d *TestIndexDriver) Delete(sql.DriverIndex, sql.PartitionIter) error {
    52  	panic("not implemented")
    53  }
    54  
    55  func (d *TestIndexDriver) Create(db, table, id string, expressions []sql.Expression, config map[string]string) (sql.DriverIndex, error) {
    56  	panic("not implemented")
    57  }