From abcd70b9cfe917e8dc790043ff9a41f6a2dcefcb Mon Sep 17 00:00:00 2001
From: Helio Machado <0x2b3bfa0+git@googlemail.com>
Date: Sat, 16 Dec 2023 15:23:44 +0100
Subject: [PATCH] param: fix exponential memory allocation (#10178)

* param: fix exponential memory allocation

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
---
 dvc/dependency/param.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dvc/dependency/param.py b/dvc/dependency/param.py
index e30439018..538e8efb5 100644
--- a/dvc/dependency/param.py
+++ b/dvc/dependency/param.py
@@ -54,12 +54,14 @@ def read_param_file(
                 continue
         return ret
 
+    from copy import deepcopy
+
     from dpath import merge
 
     for key_path in key_paths:
         merge(
             ret,
-            dpath.search(config, key_path, separator="."),
+            deepcopy(dpath.search(config, key_path, separator=".")),
             separator=".",
         )
     return ret