From 7bf7735470d9c03f6bcaaf4b1f67e483b2f247eb Mon Sep 17 00:00:00 2001
From: Nikolai Kochetov <KochetovNicolai@users.noreply.github.com>
Date: Mon, 29 Nov 2021 17:31:54 +0300
Subject: [PATCH] Update OptimizeIfWithConstantConditionVisitor.cpp

---
 src/Interpreters/OptimizeIfWithConstantConditionVisitor.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Interpreters/OptimizeIfWithConstantConditionVisitor.cpp b/src/Interpreters/OptimizeIfWithConstantConditionVisitor.cpp
index 8683fbf002d..0440c52797c 100644
--- a/src/Interpreters/OptimizeIfWithConstantConditionVisitor.cpp
+++ b/src/Interpreters/OptimizeIfWithConstantConditionVisitor.cpp
@@ -28,6 +28,8 @@ static bool tryExtractConstValueFromCondition(const ASTPtr & condition, bool & v
     }
 
     /// cast of numeric constant in condition to UInt8
+    /// Note: this solution is ad-hoc and only implemented for yandex.metrica use case.
+    /// We should allow any constant condition (or maybe remove this optimization completely) later.
     if (const auto * function = condition->as<ASTFunction>())
     {
         if (isFunctionCast(function))