github.com/dolthub/go-mysql-server@v0.18.0/sql/analyzer/resolve_tables.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 analyzer
    16  
    17  import (
    18  	"github.com/dolthub/vitess/go/mysql"
    19  
    20  	"github.com/dolthub/go-mysql-server/sql"
    21  	"github.com/dolthub/go-mysql-server/sql/plan"
    22  	"github.com/dolthub/go-mysql-server/sql/transform"
    23  )
    24  
    25  // validateDropTables ensures that each TableNode in DropTable is droppable, any UnresolvedTables are
    26  // skipped due to `IF EXISTS` clause, and there aren't any non-table nodes.
    27  func validateDropTables(ctx *sql.Context, a *Analyzer, n sql.Node, scope *plan.Scope, sel RuleSelector) (sql.Node, transform.TreeIdentity, error) {
    28  	dt, ok := n.(*plan.DropTable)
    29  	if !ok {
    30  		return n, transform.SameTree, nil
    31  	}
    32  
    33  	for _, table := range dt.Tables {
    34  		switch t := table.(type) {
    35  		case *plan.ResolvedTable:
    36  			if _, ok := t.SqlDatabase.(sql.TableDropper); !ok {
    37  				return nil, transform.SameTree, sql.ErrDropTableNotSupported.New(t.Database().Name())
    38  			}
    39  		case *plan.UnresolvedTable:
    40  			if dt.IfExists() && ctx != nil && ctx.Session != nil {
    41  				ctx.Session.Warn(&sql.Warning{
    42  					Level:   "Note",
    43  					Code:    mysql.ERBadTable,
    44  					Message: sql.ErrUnknownTable.New(t.Name()).Error(),
    45  				})
    46  				continue
    47  			}
    48  			return nil, transform.SameTree, sql.ErrUnknownTable.New(t.Name())
    49  		default:
    50  			return nil, transform.SameTree, sql.ErrUnknownTable.New(getTableName(table))
    51  		}
    52  	}
    53  
    54  	return n, transform.SameTree, nil
    55  }