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 std::fmt::Write;
16
17use anyhow::anyhow;
18use risingwave_expr::{ExprError, Result, capture_context, function};
19use risingwave_sqlparser::ast::Statement;
20
21use super::context::{CATALOG_READER, DB_NAME};
22use crate::catalog::CatalogReader;
23
24#[function("pg_get_viewdef(int4) -> varchar")]
25fn pg_get_viewdef(oid: i32, writer: &mut impl Write) -> Result<()> {
26    pg_get_viewdef_pretty(oid, false, writer)
27}
28
29#[function("pg_get_viewdef(int4, boolean) -> varchar")]
30fn pg_get_viewdef_pretty(oid: i32, _pretty: bool, writer: &mut impl Write) -> Result<()> {
31    pg_get_viewdef_impl_captured(oid, writer)
32}
33
34#[capture_context(CATALOG_READER, DB_NAME)]
35fn pg_get_viewdef_impl(
36    catalog: &CatalogReader,
37    db_name: &str,
38    oid: i32,
39    writer: &mut impl Write,
40) -> Result<()> {
41    let catalog_reader = catalog.read_guard();
42
43    if let Ok(view) = catalog_reader.get_view_by_id(db_name, oid as u32) {
44        write!(writer, "{}", view.sql).unwrap();
45        Ok(())
46    } else if let Ok(mv) = catalog_reader.get_created_table_by_id_with_db(db_name, oid as u32) {
47        let stmt = mv.create_sql_ast().map_err(|e| anyhow!(e))?;
48        if let Statement::CreateView {
49            query,
50            materialized,
51            ..
52        } = stmt
53            && materialized
54        {
55            write!(writer, "{}", query).unwrap();
56            Ok(())
57        } else {
58            Err(ExprError::InvalidParam {
59                name: "oid",
60                reason: format!("view or materialized view does not exist: {oid}").into(),
61            })
62        }
63    } else {
64        Err(ExprError::InvalidParam {
65            name: "oid",
66            reason: format!("view or materialized view does not exist: {oid}").into(),
67        })
68    }
69}
risingwave_frontend/expr/function_impl/pg_get_viewdef.rs

risingwave_frontend/expr/function_impl/
pg_get_viewdef.rs
