risingwave_expr/
expr_context.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::future::Future;
16
17use risingwave_expr::{Result as ExprResult, define_context};
18use risingwave_pb::plan_common::ExprContext;
19
20// For all execution mode.
21define_context! {
22    pub TIME_ZONE: String,
23    pub FRAGMENT_ID: u32,
24    pub VNODE_COUNT: usize,
25    pub STRICT_MODE: bool,
26}
27
28pub fn capture_expr_context() -> ExprResult<ExprContext> {
29    let time_zone = TIME_ZONE::try_with(ToOwned::to_owned)?;
30    let strict_mode = STRICT_MODE::try_with(|v| *v)?;
31    Ok(ExprContext {
32        time_zone,
33        strict_mode,
34    })
35}
36
37/// Get the vnode count from the context.
38///
39/// Always returns `Ok` in streaming mode and `Err` in batch mode.
40pub fn vnode_count() -> ExprResult<usize> {
41    VNODE_COUNT::try_with(|&x| x)
42}
43
44/// Get the strict mode from expr context
45///
46/// The return value depends on session variable. Default is true for batch query.
47///
48/// Conceptually, streaming always use non-strict mode. Our implementation doesn't read this value,
49/// although it's set to false as a placeholder.
50pub fn strict_mode() -> ExprResult<bool> {
51    STRICT_MODE::try_with(|&v| v)
52}
53
54pub async fn expr_context_scope<Fut>(expr_context: ExprContext, future: Fut) -> Fut::Output
55where
56    Fut: Future,
57{
58    TIME_ZONE::scope(
59        expr_context.time_zone.to_owned(),
60        STRICT_MODE::scope(expr_context.strict_mode, future),
61    )
62    .await
63}
risingwave_expr/expr_context.rs

risingwave_expr/
expr_context.rs
