risingwave_frontend/catalog/system_catalog/pg_catalog/
pg_attrdef.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_common::types::Fields;
16use risingwave_frontend_macro::system_catalog;
17
18/// The catalog `pg_attrdef` stores column default values. The main information about columns is
19/// stored in `pg_attribute`. Only columns for which a default value has been explicitly set will
20/// have an entry here. Ref: [`https://www.postgresql.org/docs/current/catalog-pg-attrdef.html`]
21#[system_catalog(view, "pg_catalog.pg_attrdef")]
22#[derive(Fields)]
23struct PgAttrdef {
24    oid: i32,
25    adrelid: i32,
26    adnum: i16,
27    // The column default value, use pg_get_expr(adbin, adrelid) to convert it to an SQL
28    // expression. We don't have `pg_node_tree` type yet, so we use `text` instead.
29    adbin: String,
30}