Improve project_requires method
#210
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Follows the same pattern as the response projection. One string buffer we write to.
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Summary of Changes
Hello @kamilkisiela, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request refactors the project_requires method to improve its efficiency by using a single string buffer for building the JSON output. This approach minimizes memory allocations and string concatenations, leading to better performance. The change aligns the method with the pattern used in response projection.
Highlights
- Performance Improvement: The
project_requiresmethod is optimized to use a single string buffer for writing, reducing memory allocations and improving performance. - Code Structure: The
project_requiresmethod is split intoproject_requiresandproject_requires_mutto facilitate writing to a mutable string buffer. - JSON Serialization: The code now directly writes JSON primitives (null, bool, number, string) to the buffer, avoiding intermediate string conversions.
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Federation Audit Results188 tests ±0 151 ✅ - 10 3s ⏱️ ±0s For more details on these failures, see this check. Results for commit ecf9564. ± Comparison against base commit 042bf53. |
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Code Review
The code changes improve the project_requires method by using a single string buffer to write to, following the same pattern as the response projection. This reduces memory allocations and improves performance. However, there are some areas where error handling and efficiency can be further improved.
| pub fn project_requires( | ||
| &self, | ||
| requires_selections: &Vec<SelectionItem>, | ||
| entity: &Value, | ||
| ) -> String { | ||
| // Pre-allocate a buffer, but we can do it without I think | ||
| let mut buffer = String::with_capacity(1024); | ||
| self.project_requires_mut(requires_selections, entity, &mut buffer); | ||
| buffer |
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Consider making the buffer a field of the QueryPlanExecutionContext struct to avoid reallocating it for each call. This could improve performance by reusing the same buffer across multiple calls to project_requires. Also, the comment "Pre-allocate a buffer, but we can do it without I think" suggests that the initial capacity might not be necessary or optimal. Consider benchmarking with and without the initial capacity to determine the best approach.
&self,
requires_selections: &Vec<SelectionItem>,
entity: &Value,
) -> String {
self.project_requires_mut(requires_selections, entity, &mut self.buffer);
self.buffer.clone()
}| // To avoid writing empty fields, we write to a temporary buffer first | ||
| let mut temp_buffer = String::new(); | ||
| self.project_requires_mut( | ||
| &requires_selection.selections.items, | ||
| original, | ||
| &mut temp_buffer, | ||
| ); |
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Creating a new String in each iteration can be inefficient. Consider using String::clear() on temp_buffer at the beginning of the loop to reuse the same buffer, or even better, use the main buffer directly with proper management of the first flag.
let original = entity_obj
.get(field_name)
.unwrap_or(entity_obj.get(response_key).unwrap_or(&Value::Null));
// To avoid writing empty fields, we write to a temporary buffer first
temp_buffer.clear();
self.project_requires_mut(
&requires_selection.selections.items,
original,
&mut temp_buffer,
);
✅
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2 participants
Follows the same pattern as the response projection. One string buffer we write to.