risingwave_frontend/handler/
drop_index.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::RwPgResponse;
19use crate::binder::Binder;
20use crate::catalog::CatalogError;
21use crate::catalog::root_catalog::SchemaPath;
22use crate::catalog::table_catalog::TableType;
23use crate::error::ErrorCode::PermissionDenied;
24use crate::error::Result;
25use crate::handler::HandlerArgs;
26
27pub async fn handle_drop_index(
28    handler_args: HandlerArgs,
29    index_name: ObjectName,
30    if_exists: bool,
31    cascade: bool,
32) -> Result<RwPgResponse> {
33    let session = handler_args.session;
34    let db_name = &session.database();
35    let (schema_name, index_name) = Binder::resolve_schema_qualified_name(db_name, index_name)?;
36    let search_path = session.config().search_path();
37    let user_name = &session.user_name();
38    let schema_path = SchemaPath::new(schema_name.as_deref(), &search_path, user_name);
39
40    let index_id = {
41        let reader = session.env().catalog_reader().read_guard();
42        match reader.get_index_by_name(db_name, schema_path, &index_name) {
43            Ok((index, _)) => {
44                if !session.is_super_user() && session.user_id() != index.index_table.owner {
45                    return Err(PermissionDenied(format!(
46                        "must be owner of index \"{}\"",
47                        index.name
48                    ))
49                    .into());
50                }
51
52                index.id
53            }
54            Err(err) => {
55                match err {
56                    CatalogError::NotFound("index", _) => {
57                        // index not found, try to find table below to give a better error message
58                    }
59                    _ => return Err(err.into()),
60                };
61                return match reader.get_created_table_by_name(db_name, schema_path, &index_name) {
62                    Ok((table, _)) => match table.table_type() {
63                        TableType::Index => unreachable!(),
64                        _ => Err(table.bad_drop_error()),
65                    },
66                    Err(e) => {
67                        if if_exists {
68                            Ok(RwPgResponse::builder(StatementType::DROP_INDEX)
69                                .notice(format!(
70                                    "index \"{}\" does not exist, skipping",
71                                    index_name
72                                ))
73                                .into())
74                        } else {
75                            match e {
76                                CatalogError::NotFound("table", name) => {
77                                    Err(CatalogError::NotFound("index", name).into())
78                                }
79                                _ => Err(e.into()),
80                            }
81                        }
82                    }
83                };
84            }
85        }
86    };
87
88    let catalog_writer = session.catalog_writer()?;
89    catalog_writer.drop_index(index_id, cascade).await?;
90
91    Ok(PgResponse::empty_result(StatementType::DROP_INDEX))
92}
93
94#[cfg(test)]
95mod tests {
96    use risingwave_common::catalog::{DEFAULT_DATABASE_NAME, DEFAULT_SCHEMA_NAME};
97
98    use crate::catalog::root_catalog::SchemaPath;
99    use crate::test_utils::LocalFrontend;
100
101    #[tokio::test]
102    async fn test_drop_index_handler() {
103        let sql_create_table = "create table t (v1 smallint);";
104        let sql_create_index = "create index idx on t(v1);";
105        let sql_drop_index = "drop index idx;";
106        let frontend = LocalFrontend::new(Default::default()).await;
107        frontend.run_sql(sql_create_table).await.unwrap();
108        frontend.run_sql(sql_create_index).await.unwrap();
109        frontend.run_sql(sql_drop_index).await.unwrap();
110
111        let session = frontend.session_ref();
112        let catalog_reader = session.env().catalog_reader().read_guard();
113        let schema_path = SchemaPath::Name(DEFAULT_SCHEMA_NAME);
114
115        let table =
116            catalog_reader.get_created_table_by_name(DEFAULT_DATABASE_NAME, schema_path, "idx");
117        assert!(table.is_err());
118    }
119}
risingwave_frontend/handler/drop_index.rs

risingwave_frontend/handler/
drop_index.rs
