wehub-resource-sync
130 lines
3.9 KiB
Go
130 lines
3.9 KiB
Go
// Copyright 2024 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package node
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import (
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"context"
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"github.com/cockroachdb/errors"
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"github.com/dolthub/go-mysql-server/sql"
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"github.com/dolthub/go-mysql-server/sql/plan"
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vitess "github.com/dolthub/vitess/go/vt/sqlparser"
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"github.com/dolthub/doltgresql/core"
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"github.com/dolthub/doltgresql/core/id"
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)
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// DropSequence handles the DROP SEQUENCE statement.
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type DropSequence struct {
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schema string
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sequence string
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ifExists bool
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cascade bool
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}
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var _ sql.ExecSourceRel = (*DropSequence)(nil)
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var _ vitess.Injectable = (*DropSequence)(nil)
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// NewDropSequence returns a new *DropSequence.
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func NewDropSequence(ifExists bool, schema string, sequence string, cascade bool) *DropSequence {
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return &DropSequence{
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schema: schema,
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sequence: sequence,
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ifExists: ifExists,
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cascade: cascade,
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}
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}
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// Children implements the interface sql.ExecSourceRel.
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func (c *DropSequence) Children() []sql.Node {
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return nil
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}
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// IsReadOnly implements the interface sql.ExecSourceRel.
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func (c *DropSequence) IsReadOnly() bool {
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return false
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}
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// Resolved implements the interface sql.ExecSourceRel.
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func (c *DropSequence) Resolved() bool {
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return true
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}
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// RowIter implements the interface sql.ExecSourceRel.
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func (c *DropSequence) RowIter(ctx *sql.Context, r sql.Row) (sql.RowIter, error) {
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schema, err := core.GetSchemaName(ctx, nil, c.schema)
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if err != nil {
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return nil, err
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}
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relationType, err := core.GetRelationType(ctx, schema, c.sequence)
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if err != nil {
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return nil, err
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}
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if relationType == core.RelationType_DoesNotExist {
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if c.ifExists {
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// TODO: issue a notice
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return sql.RowsToRowIter(), nil
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}
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return nil, errors.Errorf(`sequence "%s" does not exist`, c.sequence)
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}
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// TODO: we always use the current database for this operation, but it should also be possible drop a sequence in
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// a different DB (e.g. on a different branch)
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collection, err := core.GetSequencesCollectionFromContext(ctx, ctx.GetCurrentDatabase())
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if err != nil {
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return nil, err
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}
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sequenceID := id.NewSequence(schema, c.sequence)
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sequence, err := collection.GetSequence(ctx, sequenceID)
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if err != nil {
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return nil, err
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}
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if sequence.OwnerTable.IsValid() {
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if c.cascade {
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// TODO: if the sequence is referenced by the column's default value, then we also need to delete the default
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return nil, errors.Errorf(`cascading sequence drops are not yet supported`)
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} else {
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// TODO: this error is only true if the sequence is referenced by the column's default value
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return nil, errors.Errorf(`cannot drop sequence %s because other objects depend on it`, c.sequence)
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}
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}
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if err = collection.DropSequence(ctx, sequenceID); err != nil {
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return nil, err
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}
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return sql.RowsToRowIter(), nil
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}
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// Schema implements the interface sql.ExecSourceRel.
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func (c *DropSequence) Schema(ctx *sql.Context) sql.Schema {
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return nil
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}
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// String implements the interface sql.ExecSourceRel.
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func (c *DropSequence) String() string {
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return "DROP SEQUENCE"
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}
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// WithChildren implements the interface sql.ExecSourceRel.
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func (c *DropSequence) WithChildren(ctx *sql.Context, children ...sql.Node) (sql.Node, error) {
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return plan.NillaryWithChildren(c, children...)
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}
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// WithResolvedChildren implements the interface vitess.Injectable.
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func (c *DropSequence) WithResolvedChildren(ctx context.Context, children []any) (any, error) {
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if len(children) != 0 {
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return nil, ErrVitessChildCount.New(0, len(children))
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}
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return c, nil
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}
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