wehub-resource-sync
144 lines
4.1 KiB
Go
144 lines
4.1 KiB
Go
// Copyright 2025 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/functions"
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"github.com/dolthub/doltgresql/core/id"
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)
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// RoutineWithParams represent a function or a procedure with schema name, routine name and its parameters.
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type RoutineWithParams struct {
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SchemaName string
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RoutineName string
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Args []RoutineParam
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}
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// DropFunction implements DROP FUNCTION.
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type DropFunction struct {
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RoutinesWithArgs []*RoutineWithParams
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IfExists bool
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Cascade bool
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}
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var _ sql.ExecSourceRel = (*DropFunction)(nil)
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var _ vitess.Injectable = (*DropFunction)(nil)
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// NewDropFunction returns a new *DropFunction.
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func NewDropFunction(ifExists bool, routinesWithArgs []*RoutineWithParams, cascade bool) *DropFunction {
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return &DropFunction{
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IfExists: ifExists,
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RoutinesWithArgs: routinesWithArgs,
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Cascade: cascade,
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}
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}
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// Resolved implements the interface sql.ExecSourceRel.
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func (d *DropFunction) Resolved() bool {
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return true
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}
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// String implements the interface sql.ExecSourceRel.
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func (d *DropFunction) String() string {
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return "DROP FUNCTION"
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}
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// Schema implements the interface sql.ExecSourceRel.
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func (d *DropFunction) Schema(ctx *sql.Context) sql.Schema {
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return nil
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}
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// Children implements the interface sql.ExecSourceRel.
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func (d *DropFunction) Children() []sql.Node {
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return nil
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}
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// WithChildren implements the interface sql.ExecSourceRel.
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func (d *DropFunction) WithChildren(ctx *sql.Context, children ...sql.Node) (sql.Node, error) {
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return plan.NillaryWithChildren(d, children...)
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}
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// IsReadOnly implements the interface sql.ExecSourceRel.
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func (d *DropFunction) IsReadOnly() bool {
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return false
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}
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// RowIter implements the interface sql.ExecSourceRel.
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func (d *DropFunction) RowIter(ctx *sql.Context, r sql.Row) (iter sql.RowIter, err error) {
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funcColl, err := core.GetFunctionsCollectionFromContext(ctx, "")
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if err != nil {
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return nil, err
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}
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for _, routineWithArgs := range d.RoutinesWithArgs {
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err = dropFunction(ctx, funcColl, routineWithArgs, d.IfExists)
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if err != nil {
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return nil, err
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}
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}
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return sql.RowsToRowIter(), nil
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}
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// WithResolvedChildren implements the interface vitess.Injectable.
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func (d *DropFunction) 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 d, nil
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}
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func dropFunction(ctx *sql.Context, funcColl *functions.Collection, fn *RoutineWithParams, ifExists bool) error {
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// TODO: provide db
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schema, err := core.GetSchemaName(ctx, nil, fn.SchemaName)
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if err != nil {
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return err
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}
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var funcId = id.NewFunction(schema, fn.RoutineName)
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if len(fn.Args) == 0 {
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funcs, err := funcColl.GetFunctionOverloads(ctx, funcId)
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if err != nil {
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return err
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}
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if len(funcs) == 1 {
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funcId = funcs[0].ID
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} else if len(funcs) > 1 {
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funcExists := funcColl.HasFunction(ctx, funcId)
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if !funcExists {
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return errors.Errorf(`function name "%s" is not unique`, fn.RoutineName)
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}
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}
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} else {
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var argTypes = make([]id.Type, len(fn.Args))
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for i, arg := range fn.Args {
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argTypes[i] = arg.Type.ID
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}
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funcId = id.NewFunction(schema, fn.RoutineName, argTypes...)
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}
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funcExists := funcColl.HasFunction(ctx, funcId)
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if !funcExists && ifExists {
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return nil
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}
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return funcColl.DropFunction(ctx, funcId)
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}
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