From e516bef844b397a8f9c041b914e85939b225446c Mon Sep 17 00:00:00 2001
From: vdimir <vdimir@clickhouse.com>
Date: Thu, 4 Apr 2024 09:52:58 +0000
Subject: [PATCH] Annalyzer: limit maximal size of column in constant folding

---
 src/Analyzer/Passes/QueryAnalysisPass.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Analyzer/Passes/QueryAnalysisPass.cpp b/src/Analyzer/Passes/QueryAnalysisPass.cpp
index f5474ddb662..8f6c461d92d 100644
--- a/src/Analyzer/Passes/QueryAnalysisPass.cpp
+++ b/src/Analyzer/Passes/QueryAnalysisPass.cpp
@@ -6083,7 +6083,9 @@ ProjectionNames QueryAnalyzer::resolveFunction(QueryTreeNodePtr & node, Identifi
               * Example: SELECT toTypeName(sum(number)) FROM numbers(10);
               */
             if (column && isColumnConst(*column) && !typeid_cast<const ColumnConst *>(column.get())->getDataColumn().isDummy() &&
-                (!hasAggregateFunctionNodes(node) && !hasFunctionNode(node, "arrayJoin")))
+                !hasAggregateFunctionNodes(node) && !hasFunctionNode(node, "arrayJoin") &&
+                /// Sanity check: do not convert large columns to constants
+                column->byteSize() < 1_MiB)
             {
                 /// Replace function node with result constant node
                 Field column_constant_value;