risingwave_frontend/expr/function_impl/
pg_get_viewdef.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 anyhow::anyhow;
16use risingwave_expr::{ExprError, Result, capture_context, function};
17use risingwave_sqlparser::ast::Statement;
18
19use super::context::{CATALOG_READER, DB_NAME};
20use crate::catalog::CatalogReader;
21
22#[function("pg_get_viewdef(int4) -> varchar")]
23fn pg_get_viewdef(oid: i32, writer: &mut impl std::fmt::Write) -> Result<()> {
24    pg_get_viewdef_pretty(oid, false, writer)
25}
26
27#[function("pg_get_viewdef(int4, boolean) -> varchar")]
28fn pg_get_viewdef_pretty(oid: i32, _pretty: bool, writer: &mut impl std::fmt::Write) -> Result<()> {
29    pg_get_viewdef_impl_captured(oid, writer)
30}
31
32#[capture_context(CATALOG_READER, DB_NAME)]
33fn pg_get_viewdef_impl(
34    catalog: &CatalogReader,
35    db_name: &str,
36    oid: i32,
37    writer: &mut impl std::fmt::Write,
38) -> Result<()> {
39    let catalog_reader = catalog.read_guard();
40
41    if let Ok(view) = catalog_reader.get_view_by_id(db_name, oid as u32) {
42        write!(writer, "{}", view.sql).unwrap();
43        Ok(())
44    } else if let Ok(mv) = catalog_reader.get_created_table_by_id_with_db(db_name, oid as u32) {
45        let stmt = mv.create_sql_ast().map_err(|e| anyhow!(e))?;
46        if let Statement::CreateView {
47            query,
48            materialized,
49            ..
50        } = stmt
51            && materialized
52        {
53            write!(writer, "{}", query).unwrap();
54            Ok(())
55        } else {
56            Err(ExprError::InvalidParam {
57                name: "oid",
58                reason: format!("view or materialized view does not exist: {oid}").into(),
59            })
60        }
61    } else {
62        Err(ExprError::InvalidParam {
63            name: "oid",
64            reason: format!("view or materialized view does not exist: {oid}").into(),
65        })
66    }
67}
risingwave_frontend/expr/function_impl/pg_get_viewdef.rs

risingwave_frontend/expr/function_impl/
pg_get_viewdef.rs
