From eb693710c52a78a81a15ad1b2b15c96141230b36 Mon Sep 17 00:00:00 2001
From: jacktengg <18241664+jacktengg@users.noreply.github.com>
Date: Fri, 17 Mar 2023 15:50:27 +0800
Subject: [PATCH] [fix](coalesce) fix problem that coalesce function may cause
 problem of block mem reuse

---
 be/src/vec/functions/function_coalesce.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/be/src/vec/functions/function_coalesce.cpp b/be/src/vec/functions/function_coalesce.cpp
index c7edcd74ce0c0a..9c66dff293cf8d 100644
--- a/be/src/vec/functions/function_coalesce.cpp
+++ b/be/src/vec/functions/function_coalesce.cpp
@@ -68,9 +68,10 @@ class FunctionCoalesce : public IFunction {
             const auto& arg_type = block.get_by_position(arguments[i]).type;
             filtered_args.push_back(arguments[i]);
             if (!arg_type->is_nullable()) {
-                if (i == 0) { //if the first column not null, return it's directly
+                if (i == 0) {
                     block.get_by_position(result).column =
-                            block.get_by_position(arguments[0]).column;
+                            block.get_by_position(arguments[0])
+                                    .column->clone_resized(input_rows_count);
                     return Status::OK();
                 } else {
                     break;