jetro-core 0.5.0

jetro-core: parser, compiler, and VM for the Jetro JSON query language
Documentation 
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//! Physical execution dispatch — routes each pipeline to the right backend
//! without runtime fallthrough. `exec_path` is computed once at lower time by
//! `select_exec_path`; `run_with_env` does a single match and never re-examines
//! the stage list.

use crate::{
    context::{Env, EvalError},
    value::Val,
};

use super::columnar;
use super::composed_exec;
use super::indexed_exec;
use super::legacy_exec;
use super::{PhysicalExecPath, Pipeline, PipelineData};

impl Pipeline {
    /// Executes the pipeline against `root` using a freshly constructed environment.
    pub fn run(&self, root: &Val) -> Result<Val, EvalError> {
        self.run_with(root, None)
    }

    /// Executes the pipeline against `root`, optionally with a `PipelineData` cache for columnar promotion.
    pub fn run_with(&self, root: &Val, cache: Option<&dyn PipelineData>) -> Result<Val, EvalError> {
        let env = Env::new(root.clone());
        self.run_with_env(root, &env, cache)
    }

    /// Dispatches to the first applicable backend for this pipeline shape.
    /// The path was classified at lower time; no stage-list re-inspection occurs here.
    pub fn run_with_env(
        &self,
        root: &Val,
        base_env: &Env,
        cache: Option<&dyn PipelineData>,
    ) -> Result<Val, EvalError> {
        match self.exec_path {
            PhysicalExecPath::Indexed => {
                if let Some(out) = indexed_exec::run(self, root, base_env) {
                    return out;
                }
                self.run_columnar_or_below(root, base_env, cache)
            }
            PhysicalExecPath::Columnar => self.run_columnar_or_below(root, base_env, cache),
            PhysicalExecPath::Composed => composed_exec::run(self, root, base_env)
                .unwrap_or_else(|| legacy_exec::run(self, root, base_env)),
            PhysicalExecPath::Legacy => legacy_exec::run(self, root, base_env),
        }
    }

    /// Tries the columnar paths then composed then legacy.
    /// Shared by `Indexed` (after indexed misses) and `Columnar`.
    fn run_columnar_or_below(
        &self,
        root: &Val,
        base_env: &Env,
        cache: Option<&dyn PipelineData>,
    ) -> Result<Val, EvalError> {
        if let Some(out) = columnar::run_cached(self, root, cache) {
            return out;
        }
        if cache.is_none() {
            if let Some(out) = columnar::run_uncached(self, root) {
                return out;
            }
        }
        composed_exec::run(self, root, base_env)
            .unwrap_or_else(|| legacy_exec::run(self, root, base_env))
    }
}