diff --git a/build/bootstrap_mcs.sh b/build/bootstrap_mcs.sh
index 7ba080db3..b84eefe87 100755
--- a/build/bootstrap_mcs.sh
+++ b/build/bootstrap_mcs.sh
@@ -372,7 +372,7 @@ run_unit_tests()
     else
         message "Running unittests"
         cd $MARIA_BUILD_PATH
-        ${CTEST_BIN_NAME} . -R columnstore: -j $(nproc) --progress
+        ${CTEST_BIN_NAME} . -R columnstore: -j $(nproc) --progress --output-on-failure
         cd - > /dev/null
     fi
 }
diff --git a/dbcon/ddlpackageproc/altertableprocessor.cpp b/dbcon/ddlpackageproc/altertableprocessor.cpp
index 8c0dd0231..107b2409b 100644
--- a/dbcon/ddlpackageproc/altertableprocessor.cpp
+++ b/dbcon/ddlpackageproc/altertableprocessor.cpp
@@ -45,6 +45,8 @@ using namespace ddlpackage;
 #include "messagelog.h"
 using namespace logging;
 
+#include "mariadb_my_sys.h"
+
 #include "we_messages.h"
 #include "we_ddlcommandclient.h"
 #include "we_ddlcommon.h"
@@ -88,6 +90,14 @@ struct extentInfo
 
 namespace
 {
+
+bool checkTextTypesLengthAreEqual(const CalpontSystemCatalog::ColType& colType, const ColumnType& newType)
+{
+  auto newTypeCharset = get_charset(newType.fCharsetNum, MYF(MY_WME));
+  auto bytesInChar = newTypeCharset ? newTypeCharset->mbmaxlen : colType.getCharset()->mbmaxlen;
+  return colType.colWidth == newType.fLength * bytesInChar;
+}
+
 bool typesAreSame(const CalpontSystemCatalog::ColType& colType, const ColumnType& newType)
 {
   switch (colType.colDataType)
@@ -117,7 +127,7 @@ bool typesAreSame(const CalpontSystemCatalog::ColType& colType, const ColumnType
       break;
 
     case (CalpontSystemCatalog::CHAR):
-      if (newType.fType == DDL_CHAR && colType.colWidth == newType.fLength)
+      if (newType.fType == DDL_CHAR && checkTextTypesLengthAreEqual(colType, newType))
         return true;
 
       break;
@@ -252,7 +262,7 @@ bool typesAreSame(const CalpontSystemCatalog::ColType& colType, const ColumnType
       break;
 
     case (CalpontSystemCatalog::VARCHAR):
-      if (newType.fType == DDL_VARCHAR && colType.colWidth == newType.fLength)
+      if (newType.fType == DDL_VARCHAR && checkTextTypesLengthAreEqual(colType, newType))
         return true;
 
       break;
@@ -738,8 +748,7 @@ void AlterTableProcessor::addColumn(uint32_t sessionID, execplan::CalpontSystemC
   if ((dataType == CalpontSystemCatalog::CHAR && columnDefPtr->fType->fLength > 8) ||
       (dataType == CalpontSystemCatalog::VARCHAR && columnDefPtr->fType->fLength > 7) ||
       (dataType == CalpontSystemCatalog::VARBINARY && columnDefPtr->fType->fLength > 7) ||
-      (dataType == CalpontSystemCatalog::TEXT) ||
-      (dataType == CalpontSystemCatalog::BLOB))
+      (dataType == CalpontSystemCatalog::TEXT) || (dataType == CalpontSystemCatalog::BLOB))
   {
     isDict = true;
   }
diff --git a/dbcon/execplan/calpontsystemcatalog.cpp b/dbcon/execplan/calpontsystemcatalog.cpp
index 53294ccc1..699a6618b 100644
--- a/dbcon/execplan/calpontsystemcatalog.cpp
+++ b/dbcon/execplan/calpontsystemcatalog.cpp
@@ -6192,7 +6192,7 @@ CalpontSystemCatalog::ColType& CalpontSystemCatalog::ColType::operator=(const Co
   return *this;
 }
 
-CHARSET_INFO* CalpontSystemCatalog::ColType::getCharset()
+CHARSET_INFO* CalpontSystemCatalog::ColType::getCharset() const
 {
   if (!cs)
     cs = &datatypes::Charset(charsetNumber).getCharset();
diff --git a/dbcon/execplan/calpontsystemcatalog.h b/dbcon/execplan/calpontsystemcatalog.h
index bbce5ef3f..79a78654d 100644
--- a/dbcon/execplan/calpontsystemcatalog.h
+++ b/dbcon/execplan/calpontsystemcatalog.h
@@ -224,7 +224,7 @@ class CalpontSystemCatalog : public datatypes::SystemCatalog
     bool autoincrement = 0;  // set to true if  SYSCOLUMN autoincrement is �y�
     uint64_t nextvalue = 0;  // next autoincrement value
     uint32_t charsetNumber = default_charset_info->number;
-    const CHARSET_INFO* cs = nullptr;
+    const mutable CHARSET_INFO* cs = nullptr;
 
    private:
     long timeZone;
@@ -237,7 +237,7 @@ class CalpontSystemCatalog : public datatypes::SystemCatalog
             int32_t compressionType_, OID columnOID_, const ColDataType& colDataType_);
     ColType& operator=(const ColType& rhs);
 
-    CHARSET_INFO* getCharset();
+    CHARSET_INFO* getCharset() const;
 
     long getTimeZone() const
     {
diff --git a/mysql-test/columnstore/bugfixes/mcol-5779.result b/mysql-test/columnstore/bugfixes/mcol-5779.result
new file mode 100644
index 000000000..efd4b8b85
--- /dev/null
+++ b/mysql-test/columnstore/bugfixes/mcol-5779.result
@@ -0,0 +1,28 @@
+DROP DATABASE IF EXISTS mcol5779;
+CREATE DATABASE mcol5779;
+USE mcol5779;
+CREATE TABLE `t1` (
+`id` int(11) DEFAULT NULL,
+`name1` char(10) DEFAULT NULL COMMENT 'test name',
+`name2` varchar(100) DEFAULT NULL COMMENT 'test name',
+`name3` text DEFAULT NULL COMMENT 'test name'
+) ENGINE=Columnstore DEFAULT CHARSET=utf8mb3 COLLATE=utf8mb3_general_ci;
+ALTER TABLE t1 CHANGE COLUMN id id1 INT;
+ALTER TABLE t1 CHANGE COLUMN id1 id INT COMMENT 'new comment';
+ALTER TABLE t1 CHANGE COLUMN name1 firstname char(10);
+ALTER TABLE t1 CHANGE COLUMN firstname firstname char(10) COMMENT 'new comment';
+ALTER TABLE t1 CHANGE COLUMN name2 lastname varchar(100);
+ALTER TABLE t1 CHANGE COLUMN lastname lastname varchar(100) COMMENT 'new comment';
+ALTER TABLE t1 CHANGE COLUMN name3 surname text;
+ALTER TABLE t1 CHANGE COLUMN surname surname text COMMENT 'new comment';
+CREATE TABLE `t2` (
+`name4` varchar(2666) DEFAULT NULL COMMENT 'test name'
+) ENGINE=Columnstore DEFAULT CHARSET=utf8mb3 COLLATE=utf8mb3_general_ci;
+ALTER TABLE t2 CHANGE COLUMN name4 pseudoname varchar(2666);
+ALTER TABLE t2 CHANGE COLUMN pseudoname pseudoname varchar(2666) COMMENT 'new comment';
+CREATE TABLE `t3` (
+`name4` varchar(8000) DEFAULT NULL COMMENT 'test name'
+) ENGINE=Columnstore DEFAULT CHARSET=latin1;
+ALTER TABLE t3 CHANGE COLUMN name4 pseudoname varchar(8000);
+ALTER TABLE t3 CHANGE COLUMN pseudoname pseudoname varchar(8000) COMMENT 'new comment';
+DROP DATABASE mcol5779;
diff --git a/mysql-test/columnstore/bugfixes/mcol-5779.test b/mysql-test/columnstore/bugfixes/mcol-5779.test
new file mode 100644
index 000000000..66a3a4044
--- /dev/null
+++ b/mysql-test/columnstore/bugfixes/mcol-5779.test
@@ -0,0 +1,48 @@
+--source ../include/have_columnstore.inc
+
+--disable_warnings
+DROP DATABASE IF EXISTS mcol5779;
+--enable_warnings
+
+CREATE DATABASE mcol5779;
+USE mcol5779;
+
+
+CREATE TABLE `t1` (
+  `id` int(11) DEFAULT NULL,
+  `name1` char(10) DEFAULT NULL COMMENT 'test name',
+  `name2` varchar(100) DEFAULT NULL COMMENT 'test name',
+  `name3` text DEFAULT NULL COMMENT 'test name'
+) ENGINE=Columnstore DEFAULT CHARSET=utf8mb3 COLLATE=utf8mb3_general_ci;
+
+ALTER TABLE t1 CHANGE COLUMN id id1 INT;
+ALTER TABLE t1 CHANGE COLUMN id1 id INT COMMENT 'new comment';
+
+ALTER TABLE t1 CHANGE COLUMN name1 firstname char(10);
+ALTER TABLE t1 CHANGE COLUMN firstname firstname char(10) COMMENT 'new comment';
+
+ALTER TABLE t1 CHANGE COLUMN name2 lastname varchar(100);
+ALTER TABLE t1 CHANGE COLUMN lastname lastname varchar(100) COMMENT 'new comment';
+
+ALTER TABLE t1 CHANGE COLUMN name3 surname text;
+ALTER TABLE t1 CHANGE COLUMN surname surname text COMMENT 'new comment';
+
+
+CREATE TABLE `t2` (
+   `name4` varchar(2666) DEFAULT NULL COMMENT 'test name'
+) ENGINE=Columnstore DEFAULT CHARSET=utf8mb3 COLLATE=utf8mb3_general_ci;
+
+
+ALTER TABLE t2 CHANGE COLUMN name4 pseudoname varchar(2666);
+ALTER TABLE t2 CHANGE COLUMN pseudoname pseudoname varchar(2666) COMMENT 'new comment';
+
+CREATE TABLE `t3` (
+   `name4` varchar(8000) DEFAULT NULL COMMENT 'test name'
+) ENGINE=Columnstore DEFAULT CHARSET=latin1;
+
+
+ALTER TABLE t3 CHANGE COLUMN name4 pseudoname varchar(8000);
+ALTER TABLE t3 CHANGE COLUMN pseudoname pseudoname varchar(8000) COMMENT 'new comment';
+
+DROP DATABASE mcol5779;
+