risingwave_frontend/expr/function_impl/
pg_indexes_size.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 risingwave_expr::{ExprError, Result, capture_context, function};
16use thiserror_ext::AsReport;
17
18use super::context::{CATALOG_READER, DB_NAME};
19use crate::catalog::CatalogReader;
20
21/// Computes the total disk space used by indexes attached to the specified table.
22#[function("pg_indexes_size(int4) -> int8")]
23fn pg_indexes_size(oid: i32) -> Result<i64> {
24    pg_indexes_size_impl_captured(oid)
25}
26
27#[capture_context(CATALOG_READER, DB_NAME)]
28fn pg_indexes_size_impl(catalog: &CatalogReader, db_name: &str, oid: i32) -> Result<i64> {
29    let catalog = catalog.read_guard();
30    let database = catalog
31        .get_database_by_name(db_name)
32        .map_err(|e| ExprError::InvalidParam {
33            name: "oid",
34            reason: e.to_report_string().into(),
35        })?;
36    let mut sum = 0;
37    for schema in database.iter_schemas() {
38        for index in schema.iter_index() {
39            if index.primary_table.id().table_id == oid as u32 {
40                if let Some(table_stats) = catalog
41                    .table_stats()
42                    .table_stats
43                    .get(&index.primary_table.id().table_id)
44                {
45                    sum += table_stats.total_key_size + table_stats.total_value_size;
46                }
47            }
48        }
49    }
50    Ok(sum)
51}
risingwave_frontend/expr/function_impl/pg_indexes_size.rs

risingwave_frontend/expr/function_impl/
pg_indexes_size.rs
