chore: import upstream snapshot with attribution

server/node/drop_trigger.go

@@ -0,0 +1,108 @@
+// Copyright 2026 Dolthub, Inc.
+//
+// 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 node
+
+import (
+	"context"
+
+	"github.com/dolthub/go-mysql-server/sql"
+	"github.com/dolthub/go-mysql-server/sql/plan"
+	vitess "github.com/dolthub/vitess/go/vt/sqlparser"
+
+	"github.com/dolthub/doltgresql/core"
+	"github.com/dolthub/doltgresql/core/id"
+)
+
+// DropTrigger handles the DROP TRIGGER statement.
+type DropTrigger struct {
+	ifExists    bool
+	trigger     string
+	onTblSchema string
+	onTable     string
+	cascade     bool
+}
+
+var _ sql.ExecSourceRel = (*DropTrigger)(nil)
+var _ vitess.Injectable = (*DropTrigger)(nil)
+
+// NewDropTrigger returns a new *DropTrigger.
+func NewDropTrigger(ifExists bool, trigger, schema, table string, cascade bool) *DropTrigger {
+	return &DropTrigger{
+		ifExists:    ifExists,
+		trigger:     trigger,
+		onTblSchema: schema,
+		onTable:     table,
+		cascade:     cascade,
+	}
+}
+
+// Children implements the interface sql.ExecSourceRel.
+func (c *DropTrigger) Children() []sql.Node {
+	return nil
+}
+
+// IsReadOnly implements the interface sql.ExecSourceRel.
+func (c *DropTrigger) IsReadOnly() bool {
+	return false
+}
+
+// Resolved implements the interface sql.ExecSourceRel.
+func (c *DropTrigger) Resolved() bool {
+	return true
+}
+
+// RowIter implements the interface sql.ExecSourceRel.
+func (c *DropTrigger) RowIter(ctx *sql.Context, r sql.Row) (sql.RowIter, error) {
+	schema, err := core.GetSchemaName(ctx, nil, c.onTblSchema)
+	if err != nil {
+		return nil, err
+	}
+	collection, err := core.GetTriggersCollectionFromContext(ctx, ctx.GetCurrentDatabase())
+	if err != nil {
+		return nil, err
+	}
+	triggerID := id.NewTrigger(schema, c.onTable, c.trigger)
+	hasTrigger := collection.HasTrigger(ctx, triggerID)
+	if !hasTrigger && c.ifExists {
+		return sql.RowsToRowIter(), nil
+	}
+	if err = collection.DropTrigger(ctx, triggerID); err != nil {
+		return nil, err
+	}
+	return sql.RowsToRowIter(), nil
+}
+
+// Schema implements the interface sql.ExecSourceRel.
+func (c *DropTrigger) Schema(ctx *sql.Context) sql.Schema {
+	return nil
+}
+
+// String implements the interface sql.ExecSourceRel.
+func (c *DropTrigger) String() string {
+	return "DROP TRIGGER"
+}
+
+// WithChildren implements the interface sql.ExecSourceRel.
+func (c *DropTrigger) WithChildren(ctx *sql.Context, children ...sql.Node) (sql.Node, error) {
+	return plan.NillaryWithChildren(c, children...)
+}
+
+// WithResolvedChildren implements the interface vitess.Injectable.
+func (c *DropTrigger) WithResolvedChildren(ctx context.Context, children []any) (any, error) {
+	if len(children) != 0 {
+		return nil, ErrVitessChildCount.New(0, len(children))
+	}
+	return c, nil
+}