risingwave_frontend/handler/
drop_connection.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_pb::catalog::connection::Info as ConnectionInfo;
17use risingwave_pb::catalog::connection_params::ConnectionType;
18use risingwave_sqlparser::ast::ObjectName;
19
20use super::RwPgResponse;
21use crate::binder::Binder;
22use crate::catalog::root_catalog::SchemaPath;
23use crate::error::{ErrorCode, Result};
24use crate::handler::HandlerArgs;
25
26pub async fn handle_drop_connection(
27    handler_args: HandlerArgs,
28    connection_name: ObjectName,
29    if_exists: bool,
30    cascade: bool,
31) -> Result<RwPgResponse> {
32    let session = handler_args.session;
33    let db_name = &session.database();
34    let (schema_name, connection_name) =
35        Binder::resolve_schema_qualified_name(db_name, &connection_name)?;
36    let search_path = session.config().search_path();
37    let user_name = &session.user_name();
38
39    let schema_path = SchemaPath::new(schema_name.as_deref(), &search_path, user_name);
40
41    let (connection_id, is_iceberg_connection) = {
42        let reader = session.env().catalog_reader().read_guard();
43        let (connection, schema_name) =
44            match reader.get_connection_by_name(db_name, schema_path, connection_name.as_str()) {
45                Ok((c, s)) => (c, s),
46                Err(e) => {
47                    return if if_exists {
48                        Ok(RwPgResponse::builder(StatementType::DROP_CONNECTION)
49                            .notice(format!(
50                                "connection \"{}\" does not exist, skipping",
51                                connection_name
52                            ))
53                            .into())
54                    } else {
55                        Err(e.into())
56                    };
57                }
58            };
59        session.check_privilege_for_drop_alter(schema_name, &**connection)?;
60
61        // Check if this is an Iceberg connection
62        let is_iceberg = match &connection.info {
63            ConnectionInfo::ConnectionParams(params) => {
64                params.connection_type == ConnectionType::Iceberg as i32
65            }
66            _ => false,
67        };
68
69        (connection.id, is_iceberg)
70    };
71
72    // Ban DROP CASCADE for Iceberg connections
73    if is_iceberg_connection && cascade {
74        return Err(ErrorCode::NotSupported(
75            "DROP CONNECTION CASCADE".to_owned(),
76            "Please drop dependent objects manually before dropping the Iceberg connection, or use DROP CONNECTION without CASCADE".to_owned(),
77        )
78        .into());
79    }
80
81    let catalog_writer = session.catalog_writer()?;
82    catalog_writer
83        .drop_connection(connection_id, cascade)
84        .await?;
85
86    Ok(PgResponse::empty_result(StatementType::DROP_CONNECTION))
87}
risingwave_frontend/handler/drop_connection.rs

risingwave_frontend/handler/
drop_connection.rs
