From d072c6bc22da96d056fd02f36708ef60e9ad048b Mon Sep 17 00:00:00 2001
From: "Alexander A. Klimov" <alexander.klimov@icinga.com>
Date: Thu, 10 Nov 2022 12:49:11 +0100
Subject: [PATCH] IndexerExpression#GetReference(): ref, not copy, index if
 it's a literal string

---
 lib/config/expression.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/lib/config/expression.cpp b/lib/config/expression.cpp
index 65e0a3e97..43d164faf 100644
--- a/lib/config/expression.cpp
+++ b/lib/config/expression.cpp
@@ -792,8 +792,14 @@ bool IndexerExpression::GetReference(ScriptFrame& frame, bool init_dict, Value *
 		*parent = operand1.GetValue();
 	}
 
-	ExpressionResult operand2 = m_Operand2->Evaluate(frame);
-	index->Set(operand2.GetValue());
+	auto lit (dynamic_cast<LiteralExpression*>(m_Operand2.get()));
+
+	if (lit && lit->GetValue().IsString()) {
+		index->Set(&lit->GetValue().Get<String>());
+	} else {
+		ExpressionResult operand2 = m_Operand2->Evaluate(frame);
+		index->Set(operand2.GetValue());
+	}
 
 	if (dhint) {
 		if (psdhint)