From c5adbeb2e04fd12942eef4cfbfbcb9e9787263a6 Mon Sep 17 00:00:00 2001
From: Xiayue Charles Lin <charles@eventualcomputing.com>
Date: Thu, 14 Sep 2023 14:37:01 -0600
Subject: [PATCH] Fix using request::add instead of ::max

---
 .../rules/push_down_projection.rs             |  7 ++++--
 src/daft-plan/src/resource_request.rs         | 23 ++++++++++---------
 2 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/src/daft-plan/src/optimization/rules/push_down_projection.rs b/src/daft-plan/src/optimization/rules/push_down_projection.rs
index 86447a5d4a..78b55655e7 100644
--- a/src/daft-plan/src/optimization/rules/push_down_projection.rs
+++ b/src/daft-plan/src/optimization/rules/push_down_projection.rs
@@ -8,7 +8,7 @@ use indexmap::IndexSet;
 
 use crate::{
     logical_ops::{Aggregate, Project, Source},
-    LogicalPlan,
+    LogicalPlan, ResourceRequest,
 };
 
 use super::{ApplyOrder, OptimizerRule, Transformed};
@@ -123,7 +123,10 @@ impl PushDownProjection {
                 let new_plan: LogicalPlan = Project::try_new(
                     upstream_projection.input.clone(),
                     merged_projection,
-                    &upstream_projection.resource_request + &projection.resource_request,
+                    ResourceRequest::max(&[
+                        &upstream_projection.resource_request,
+                        &projection.resource_request,
+                    ]),
                 )?
                 .into();
                 let new_plan: Arc<LogicalPlan> = new_plan.into();
diff --git a/src/daft-plan/src/resource_request.rs b/src/daft-plan/src/resource_request.rs
index 62df5166ca..b4dbb940d0 100644
--- a/src/daft-plan/src/resource_request.rs
+++ b/src/daft-plan/src/resource_request.rs
@@ -1,11 +1,8 @@
 use daft_core::{impl_bincode_py_state_serialization, utils::hashable_float_wrapper::FloatWrapper};
+#[cfg(feature = "python")]
+use pyo3::{pyclass, pyclass::CompareOp, pymethods, types::PyBytes, PyResult, Python};
 use std::hash::{Hash, Hasher};
 use std::ops::Add;
-#[cfg(feature = "python")]
-use {
-    pyo3::{pyclass, pyclass::CompareOp, pymethods, types::PyBytes, PyResult, Python},
-    std::cmp::max,
-};
 
 use serde::{Deserialize, Serialize};
 
@@ -29,6 +26,15 @@ impl ResourceRequest {
             memory_bytes,
         }
     }
+
+    pub fn max(resource_requests: &[&Self]) -> Self {
+        resource_requests.iter().fold(Default::default(), |acc, e| {
+            let max_num_cpus = lift(float_max, acc.num_cpus, e.num_cpus);
+            let max_num_gpus = lift(float_max, acc.num_gpus, e.num_gpus);
+            let max_memory_bytes = lift(std::cmp::max, acc.memory_bytes, e.memory_bytes);
+            Self::new_internal(max_num_cpus, max_num_gpus, max_memory_bytes)
+        })
+    }
 }
 
 impl Add for &ResourceRequest {
@@ -82,12 +88,7 @@ impl ResourceRequest {
 
     #[staticmethod]
     pub fn max_resources(resource_requests: Vec<Self>) -> Self {
-        resource_requests.iter().fold(Default::default(), |acc, e| {
-            let max_num_cpus = lift(float_max, acc.num_cpus, e.num_cpus);
-            let max_num_gpus = lift(float_max, acc.num_gpus, e.num_gpus);
-            let max_memory_bytes = lift(max, acc.memory_bytes, e.memory_bytes);
-            Self::new_internal(max_num_cpus, max_num_gpus, max_memory_bytes)
-        })
+        Self::max(&resource_requests.iter().collect::<Vec<_>>())
     }
 
     #[getter]