From 35eb846105c30bc934f1d29dd913e6eb150562c6 Mon Sep 17 00:00:00 2001
From: "codeflash-ai[bot]"
 <148906541+codeflash-ai[bot]@users.noreply.github.com>
Date: Wed, 26 Nov 2025 07:12:04 +0000
Subject: [PATCH] Optimize get_dependency_query_params
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The optimization avoids unnecessary URL encoding and string parsing for the common case where dictionary parameters contain only scalar values (strings, numbers, booleans) rather than lists or tuples.

**Key Changes:**
- Added a check `any(isinstance(v, (list, tuple)) for v in params.values())` to detect if any parameter values are multi-valued
- For scalar-only dictionaries, pass the dict directly to `QueryParams(params)` instead of going through `urlencode`
- Only use the expensive `urlencode(params, doseq=True)` path when multi-valued parameters are detected

**Why This is Faster:**
The original code always called `urlencode(params, doseq=True)` which converts the dictionary to a URL-encoded string, then `QueryParams` parses that string back into key-value pairs. This double conversion (dict → string → parsed structure) is costly. The optimization bypasses this for the common case where parameters are simple scalars.

**Performance Impact:**
From the profiler results, the expensive `urlencode` line dropped from 53% of total time to just 8% when needed. The largest gains are seen in the "large scale" tests - up to 164% speedup for cases with many parameters, since each parameter avoids the encoding/parsing overhead.

**Hot Path Benefits:**
Based on the function references, `get_dependency_query_params` is called from `deserialize_query_params` and `extract_query_params`, which likely process user input parameters frequently. The optimization particularly benefits workloads with many simple parameters (common in web APIs), while preserving full compatibility for complex multi-valued parameters.
---
 src/titiler/core/titiler/core/utils.py | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/titiler/core/titiler/core/utils.py b/src/titiler/core/titiler/core/utils.py
index 0f7310ef8..82adbfc18 100644
--- a/src/titiler/core/titiler/core/utils.py
+++ b/src/titiler/core/titiler/core/utils.py
@@ -164,11 +164,15 @@ def get_dependency_query_params(
     """
     dep = get_dependant(path="", call=dependency)
 
-    qp = (
-        QueryParams(urlencode(params, doseq=True))
-        if isinstance(params, Dict)
-        else params
-    )
+    if isinstance(params, Dict):
+        has_multi = any(isinstance(v, (list, tuple)) for v in params.values())
+        if has_multi:
+            qp = QueryParams(urlencode(params, doseq=True))
+        else:
+            qp = QueryParams(params)
+    else:
+        qp = params
+
     return request_params_to_args(dep.query_params, qp)