risingwave_frontend/handler/
drop_subscription.rs

1// Copyright 2025 RisingWave Labs
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
15use pgwire::pg_response::{PgResponse, StatementType};
16use risingwave_sqlparser::ast::ObjectName;
17
18use super::{HandlerArgs, RwPgResponse};
19use crate::Binder;
20use crate::catalog::root_catalog::SchemaPath;
21use crate::error::Result;
22
23pub async fn handle_drop_subscription(
24    handler_args: HandlerArgs,
25    subscription_name: ObjectName,
26    if_exists: bool,
27    cascade: bool,
28) -> Result<RwPgResponse> {
29    let session = handler_args.session;
30    let db_name = &session.database();
31    let (schema_name, subscription_name) =
32        Binder::resolve_schema_qualified_name(db_name, subscription_name)?;
33    let search_path = session.config().search_path();
34    let user_name = &session.user_name();
35    let schema_path = SchemaPath::new(schema_name.as_deref(), &search_path, user_name);
36
37    let subscription = {
38        let catalog_reader = session.env().catalog_reader().read_guard();
39        let (subscription, schema_name) =
40            match catalog_reader.get_subscription_by_name(db_name, schema_path, &subscription_name)
41            {
42                Ok((subscription, schema)) => (subscription.clone(), schema),
43                Err(e) => {
44                    return if if_exists {
45                        Ok(RwPgResponse::builder(StatementType::DROP_SUBSCRIPTION)
46                            .notice(format!(
47                                "subscription \"{}\" does not exist, skipping",
48                                subscription_name
49                            ))
50                            .into())
51                    } else {
52                        Err(e.into())
53                    };
54                }
55            };
56
57        session.check_privilege_for_drop_alter(schema_name, &*subscription)?;
58
59        subscription
60    };
61
62    let subscription_id = subscription.id;
63
64    let catalog_writer = session.catalog_writer()?;
65    catalog_writer
66        .drop_subscription(subscription_id.subscription_id, cascade)
67        .await?;
68
69    Ok(PgResponse::empty_result(StatementType::DROP_SUBSCRIPTION))
70}
risingwave_frontend/handler/drop_subscription.rs

risingwave_frontend/handler/
drop_subscription.rs
