risingwave_frontend/handler/
create_table_as.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::collections::HashSet;
16
17use either::Either;
18use pgwire::pg_response::StatementType;
19use risingwave_common::catalog::{ColumnCatalog, ColumnDesc};
20use risingwave_pb::ddl_service::TableJobType;
21use risingwave_sqlparser::ast::{ColumnDef, ObjectName, OnConflict, Query, Statement};
22
23use super::{HandlerArgs, RwPgResponse};
24use crate::binder::BoundStatement;
25use crate::error::{ErrorCode, Result};
26use crate::handler::create_table::{
27    ColumnIdGenerator, CreateTableProps, gen_create_table_plan_without_source,
28};
29use crate::handler::query::handle_query;
30use crate::stream_fragmenter::GraphJobType;
31use crate::{Binder, OptimizerContext, build_graph};
32
33pub async fn handle_create_as(
34    handler_args: HandlerArgs,
35    table_name: ObjectName,
36    if_not_exists: bool,
37    query: Box<Query>,
38    column_defs: Vec<ColumnDef>,
39    append_only: bool,
40    on_conflict: Option<OnConflict>,
41    with_version_column: Option<String>,
42    ast_engine: risingwave_sqlparser::ast::Engine,
43) -> Result<RwPgResponse> {
44    if column_defs.iter().any(|column| column.data_type.is_some()) {
45        return Err(ErrorCode::InvalidInputSyntax(
46            "Should not specify data type in CREATE TABLE AS".into(),
47        )
48        .into());
49    }
50    let engine = match ast_engine {
51        risingwave_sqlparser::ast::Engine::Hummock => risingwave_common::catalog::Engine::Hummock,
52        risingwave_sqlparser::ast::Engine::Iceberg => risingwave_common::catalog::Engine::Iceberg,
53    };
54
55    let session = handler_args.session.clone();
56
57    if let Either::Right(resp) = session.check_relation_name_duplicated(
58        table_name.clone(),
59        StatementType::CREATE_TABLE,
60        if_not_exists,
61    )? {
62        return Ok(resp);
63    }
64
65    let mut col_id_gen = ColumnIdGenerator::new_initial();
66
67    // Generate catalog descs from query
68    let mut columns: Vec<_> = {
69        let mut binder = Binder::new(&session);
70        let bound = binder.bind(Statement::Query(query.clone()))?;
71        if let BoundStatement::Query(query) = bound {
72            // Create ColumnCatelog by Field
73            query
74                .schema()
75                .fields()
76                .iter()
77                .map(|field| ColumnCatalog {
78                    column_desc: ColumnDesc::from_field_without_column_id(field),
79                    is_hidden: false,
80                })
81                .collect()
82        } else {
83            unreachable!()
84        }
85    };
86
87    // Generate column id.
88    for c in &mut columns {
89        col_id_gen.generate(c)?;
90    }
91
92    if column_defs.len() > columns.len() {
93        return Err(ErrorCode::InvalidInputSyntax(
94            "too many column names were specified".to_owned(),
95        )
96        .into());
97    }
98
99    // Override column name if it specified in creaet statement.
100    column_defs.iter().enumerate().for_each(|(idx, column)| {
101        columns[idx].column_desc.name = column.name.real_value();
102    });
103
104    let (graph, source, table) = {
105        let context = OptimizerContext::from_handler_args(handler_args.clone());
106        let (_, secret_refs, connection_refs) = context.with_options().clone().into_parts();
107        if !secret_refs.is_empty() || !connection_refs.is_empty() {
108            return Err(crate::error::ErrorCode::InvalidParameterValue(
109                "Secret reference and Connection reference are not allowed in options for CREATE TABLE AS".to_owned(),
110            )
111            .into());
112        }
113        let (plan, table) = gen_create_table_plan_without_source(
114            context,
115            table_name.clone(),
116            columns,
117            vec![],
118            vec![],
119            vec![], // No watermark should be defined in for `CREATE TABLE AS`
120            col_id_gen.into_version(),
121            CreateTableProps {
122                // Note: by providing and persisting an empty definition, querying the definition of the table
123                // will hit the purification logic, which will construct it based on the catalog.
124                definition: "".to_owned(),
125                append_only,
126                on_conflict: on_conflict.into(),
127                with_version_column,
128                webhook_info: None,
129                engine,
130            },
131        )?;
132        let graph = build_graph(plan, Some(GraphJobType::Table))?;
133
134        (graph, None, table)
135    };
136
137    tracing::trace!(
138        "name={}, graph=\n{}",
139        table_name,
140        serde_json::to_string_pretty(&graph).unwrap()
141    );
142
143    let catalog_writer = session.catalog_writer()?;
144    catalog_writer
145        .create_table(
146            source,
147            table.to_prost(),
148            graph,
149            TableJobType::Unspecified,
150            if_not_exists,
151            HashSet::default(),
152        )
153        .await?;
154
155    // Generate insert
156    let insert = Statement::Insert {
157        table_name,
158        columns: vec![],
159        source: query,
160        returning: vec![],
161    };
162
163    handle_query(handler_args, insert, vec![]).await
164}
risingwave_frontend/handler/create_table_as.rs

risingwave_frontend/handler/
create_table_as.rs
