diff --git a/mysql-test/columnstore/bugfixes/mcol-4741-strings-ranges-are-unsigned.result b/mysql-test/columnstore/bugfixes/mcol-4741-strings-ranges-are-unsigned.result
new file mode 100644
index 000000000..c9e2db639
--- /dev/null
+++ b/mysql-test/columnstore/bugfixes/mcol-4741-strings-ranges-are-unsigned.result
@@ -0,0 +1,12 @@
+DROP DATABASE IF EXISTS db4741;
+CREATE DATABASE db4741;
+USE db4741;
+CREATE TABLE t (x VARCHAR(5) DEFAULT '') engine = columnstore;
+LOAD DATA LOCAL infile 'MTR_SUITE_DIR/../std_data/mcol-4741-part-1-strings-and-nulls.txt' INTO TABLE t;
+SELECT COUNT(*) FROM t WHERE x='val';
+COUNT(*)
+2
+LOAD DATA LOCAL infile 'MTR_SUITE_DIR/../std_data/mcol-4741-part-2-empty-strings.txt' INTO TABLE t;
+SELECT COUNT(*) FROM t WHERE x='val';
+COUNT(*)
+2
diff --git a/mysql-test/columnstore/bugfixes/mcol-4741-strings-ranges-are-unsigned.test b/mysql-test/columnstore/bugfixes/mcol-4741-strings-ranges-are-unsigned.test
new file mode 100644
index 000000000..06cc2abdd
--- /dev/null
+++ b/mysql-test/columnstore/bugfixes/mcol-4741-strings-ranges-are-unsigned.test
@@ -0,0 +1,17 @@
+--disable_warnings
+DROP DATABASE IF EXISTS db4741;
+--enable_warnings
+CREATE DATABASE db4741;
+USE db4741;
+CREATE TABLE t (x VARCHAR(5) DEFAULT '') engine = columnstore;
+
+--replace_result $MTR_SUITE_DIR MTR_SUITE_DIR
+--eval LOAD DATA LOCAL infile '$MTR_SUITE_DIR/../std_data/mcol-4741-part-1-strings-and-nulls.txt' INTO TABLE t
+
+SELECT COUNT(*) FROM t WHERE x='val';
+
+--replace_result $MTR_SUITE_DIR MTR_SUITE_DIR
+--eval LOAD DATA LOCAL infile '$MTR_SUITE_DIR/../std_data/mcol-4741-part-2-empty-strings.txt' INTO TABLE t
+
+SELECT COUNT(*) FROM t WHERE x='val';
+
diff --git a/mysql-test/columnstore/std_data/mcol-4741-part-1-strings-and-nulls.txt b/mysql-test/columnstore/std_data/mcol-4741-part-1-strings-and-nulls.txt
new file mode 100644
index 000000000..00f06a1c4
--- /dev/null
+++ b/mysql-test/columnstore/std_data/mcol-4741-part-1-strings-and-nulls.txt
@@ -0,0 +1,6 @@
+val
+val
+aal
+xal
+\N
+\N
diff --git a/mysql-test/columnstore/std_data/mcol-4741-part-2-empty-strings.txt b/mysql-test/columnstore/std_data/mcol-4741-part-2-empty-strings.txt
new file mode 100644
index 000000000..3f2ff2d6c
--- /dev/null
+++ b/mysql-test/columnstore/std_data/mcol-4741-part-2-empty-strings.txt
@@ -0,0 +1,5 @@
+
+
+
+
+
diff --git a/versioning/BRM/extentmap.cpp b/versioning/BRM/extentmap.cpp
index aba3e3211..136373bbc 100644
--- a/versioning/BRM/extentmap.cpp
+++ b/versioning/BRM/extentmap.cpp
@@ -893,18 +893,18 @@ void ExtentMap::mergeExtentsMaxMin(CPMaxMinMergeMap_t& cpMap, bool useLock)
                             // Swap byte order to do binary string comparison
                             if (isCharType(it->second.type))
                             {
-                                int64_t newMinVal =
-                                    static_cast<int64_t>( uint64ToStr(
+                                uint64_t newMinVal =
+                                    static_cast<uint64_t>( uint64ToStr(
                                                               static_cast<uint64_t>(it->second.min)));
-                                int64_t newMaxVal =
-                                    static_cast<int64_t>( uint64ToStr(
+                                uint64_t newMaxVal =
+                                    static_cast<uint64_t>( uint64ToStr(
                                                               static_cast<uint64_t>(it->second.max)));
-                                int64_t oldMinVal =
-                                    static_cast<int64_t>( uint64ToStr(
+                                uint64_t oldMinVal =
+                                    static_cast<uint64_t>( uint64ToStr(
                                                               static_cast<uint64_t>(
                                                                   fExtentMap[i].partition.cprange.loVal)) );
-                                int64_t oldMaxVal =
-                                    static_cast<int64_t>( uint64ToStr(
+                                uint64_t oldMaxVal =
+                                    static_cast<uint64_t>( uint64ToStr(
                                                               static_cast<uint64_t>(
                                                                   fExtentMap[i].partition.cprange.hiVal)) );