risingwave_frontend/handler/
create_view.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
15//! Handle creation of logical (non-materialized) views.
16
17use either::Either;
18use itertools::Itertools;
19use pgwire::pg_response::{PgResponse, StatementType};
20use risingwave_common::util::iter_util::ZipEqFast;
21use risingwave_pb::catalog::PbView;
22use risingwave_sqlparser::ast::{Ident, ObjectName, Query, Statement};
23
24use super::RwPgResponse;
25use crate::binder::Binder;
26use crate::error::Result;
27use crate::handler::HandlerArgs;
28use crate::optimizer::OptimizerContext;
29
30pub async fn handle_create_view(
31    handler_args: HandlerArgs,
32    if_not_exists: bool,
33    name: ObjectName,
34    columns: Vec<Ident>,
35    query: Query,
36) -> Result<RwPgResponse> {
37    let session = handler_args.session.clone();
38    let db_name = &session.database();
39    let (schema_name, view_name) = Binder::resolve_schema_qualified_name(db_name, name.clone())?;
40
41    let (database_id, schema_id) = session.get_database_and_schema_id_for_create(schema_name)?;
42
43    let properties = handler_args.with_options.clone();
44
45    if let Either::Right(resp) = session.check_relation_name_duplicated(
46        name.clone(),
47        StatementType::CREATE_VIEW,
48        if_not_exists,
49    )? {
50        return Ok(resp);
51    }
52
53    // plan the query to validate it and resolve dependencies
54    let (dependent_relations, schema) = {
55        let context = OptimizerContext::from_handler_args(handler_args);
56        let super::query::BatchQueryPlanResult {
57            schema,
58            dependent_relations,
59            ..
60        } = super::query::gen_batch_plan_by_statement(
61            &session,
62            context.into(),
63            Statement::Query(Box::new(query.clone())),
64        )?;
65
66        (dependent_relations, schema)
67    };
68
69    let columns = if columns.is_empty() {
70        schema.fields().to_vec()
71    } else {
72        if columns.len() != schema.fields().len() {
73            return Err(crate::error::ErrorCode::InternalError(
74                "view has different number of columns than the query's columns".to_owned(),
75            )
76            .into());
77        }
78        schema
79            .fields()
80            .iter()
81            .zip_eq_fast(columns)
82            .map(|(f, c)| {
83                let mut field = f.clone();
84                field.name = c.real_value();
85                field
86            })
87            .collect()
88    };
89
90    let (properties, secret_refs, connection_refs) = properties.into_parts();
91    if !secret_refs.is_empty() || !connection_refs.is_empty() {
92        return Err(crate::error::ErrorCode::InvalidParameterValue(
93            "Secret reference and Connection reference are not allowed in create view options"
94                .to_owned(),
95        )
96        .into());
97    }
98
99    let view = PbView {
100        id: 0,
101        schema_id,
102        database_id,
103        name: view_name,
104        properties,
105        owner: session.user_id(),
106        dependent_relations: dependent_relations
107            .into_iter()
108            .map(|t| t.table_id)
109            .collect_vec(),
110        sql: format!("{}", query),
111        columns: columns.into_iter().map(|f| f.to_prost()).collect(),
112    };
113
114    let catalog_writer = session.catalog_writer()?;
115    catalog_writer.create_view(view).await?;
116
117    Ok(PgResponse::empty_result(StatementType::CREATE_VIEW))
118}
risingwave_frontend/handler/create_view.rs

risingwave_frontend/handler/
create_view.rs
