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delete.go
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delete.go
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/*
Copyright 2019 The Vitess Authors.
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,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package planbuilder
import (
vtrpcpb "vitess.io/vitess/go/vt/proto/vtrpc"
"vitess.io/vitess/go/vt/sqlparser"
"vitess.io/vitess/go/vt/vterrors"
"vitess.io/vitess/go/vt/vtgate/engine"
)
// buildDeletePlan builds the instructions for a DELETE statement.
func buildDeletePlan(stmt sqlparser.Statement, reservedVars *sqlparser.ReservedVars, vschema ContextVSchema) (engine.Primitive, error) {
del := stmt.(*sqlparser.Delete)
var err error
if len(del.TableExprs) == 1 && len(del.Targets) == 1 {
del, err = rewriteSingleTbl(del)
if err != nil {
return nil, err
}
}
dml, ksidVindex, ksidCol, err := buildDMLPlan(vschema, "delete", del, reservedVars, del.TableExprs, del.Where, del.OrderBy, del.Limit, del.Comments, del.Targets)
if err != nil {
return nil, err
}
edel := &engine.Delete{
DML: *dml,
}
if dml.Opcode == engine.Unsharded {
return edel, nil
}
if len(del.Targets) > 1 {
return nil, vterrors.New(vtrpcpb.Code_UNIMPLEMENTED, "multi-table delete statement in not supported in sharded database")
}
if len(del.Targets) == 1 && del.Targets[0].Name != edel.Table.Name {
return nil, vterrors.NewErrorf(vtrpcpb.Code_INVALID_ARGUMENT, vterrors.UnknownTable, "Unknown table '%s' in MULTI DELETE", del.Targets[0].Name.String())
}
if len(edel.Table.Owned) > 0 {
edel.OwnedVindexQuery = generateDMLSubquery(del.Where, del.OrderBy, del.Limit, edel.Table, ksidCol)
edel.KsidVindex = ksidVindex
}
return edel, nil
}
func rewriteSingleTbl(del *sqlparser.Delete) (*sqlparser.Delete, error) {
atExpr, ok := del.TableExprs[0].(*sqlparser.AliasedTableExpr)
if !ok {
return del, nil
}
if !atExpr.As.IsEmpty() && !sqlparser.EqualsTableIdent(del.Targets[0].Name, atExpr.As) {
//Unknown table in MULTI DELETE
return nil, vterrors.NewErrorf(vtrpcpb.Code_INVALID_ARGUMENT, vterrors.UnknownTable, "Unknown table '%s' in MULTI DELETE", del.Targets[0].Name.String())
}
tbl, ok := atExpr.Expr.(sqlparser.TableName)
if !ok {
// derived table
return nil, vterrors.NewErrorf(vtrpcpb.Code_INVALID_ARGUMENT, vterrors.NonUpdateableTable, "The target table %s of the DELETE is not updatable", atExpr.As.String())
}
if atExpr.As.IsEmpty() && !sqlparser.EqualsTableIdent(del.Targets[0].Name, tbl.Name) {
//Unknown table in MULTI DELETE
return nil, vterrors.NewErrorf(vtrpcpb.Code_INVALID_ARGUMENT, vterrors.UnknownTable, "Unknown table '%s' in MULTI DELETE", del.Targets[0].Name.String())
}
del.TableExprs = sqlparser.TableExprs{&sqlparser.AliasedTableExpr{Expr: tbl}}
del.Targets = nil
if del.Where != nil {
_ = sqlparser.Rewrite(del.Where, func(cursor *sqlparser.Cursor) bool {
switch node := cursor.Node().(type) {
case *sqlparser.ColName:
if !node.Qualifier.IsEmpty() {
node.Qualifier = tbl
}
}
return true
}, nil)
}
return del, nil
}