diff --git a/datatypes/mcs_decimal.h b/datatypes/mcs_decimal.h
index 346dd2dda..1a905bd72 100644
--- a/datatypes/mcs_decimal.h
+++ b/datatypes/mcs_decimal.h
@@ -25,6 +25,7 @@
 
 using int128_t = __int128;
 using ColTypeAlias = execplan::CalpontSystemCatalog::ColType;
+using ColDataTypeAlias = execplan::CalpontSystemCatalog::ColDataType;
 
 namespace execplan
 {
@@ -166,7 +167,7 @@ class Decimal
 
         /**
             @brief The method detects whether decimal type is wide
-            using csc data type.
+            using csc colType.
         */
         static constexpr inline bool isWideDecimalType(const ColTypeAlias& ct)
         {
@@ -185,6 +186,18 @@ class Decimal
                 && precision <= INT128MAXPRECISION;
         }
 
+        /**
+            @brief The method detects whether decimal type is wide
+            using datatype and width.
+        */
+        static constexpr inline bool isWideDecimalType(const ColDataTypeAlias dt,
+            const int32_t width)
+        {
+            return (width == MAXDECIMALWIDTH &&
+                (dt == execplan::CalpontSystemCatalog::DECIMAL ||
+                 dt == execplan::CalpontSystemCatalog::UDECIMAL));
+        }
+
         /**
             @brief The method sets the legacy scale and precision of a wide decimal
             column which is the result of an arithmetic operation.
diff --git a/dbcon/joblist/tupleconstantstep.cpp b/dbcon/joblist/tupleconstantstep.cpp
index 2a6a2ee7f..ccbff89c7 100644
--- a/dbcon/joblist/tupleconstantstep.cpp
+++ b/dbcon/joblist/tupleconstantstep.cpp
@@ -512,31 +512,18 @@ void TupleConstantStep::fillInConstants(const rowgroup::Row& rowIn, rowgroup::Ro
     if (fIndexConst.size() > 1 || fIndexConst[0] != 0)
     {
         copyRow(fRowConst, &rowOut);
-        //memcpy(rowOut.getData(), fRowConst.getData(), fRowConst.getSize());
         rowOut.setRid(rowIn.getRelRid());
 
         for (uint64_t j = 0; j < fIndexMapping.size(); ++j)
             rowIn.copyField(rowOut, fIndexMapping[j], j);
-
-        //rowIn.copyField(rowOut.getData() + rowOut.getOffset(fIndexMapping[j]), j);
     }
     else // only first column is constant
     {
-        //size_t n = rowOut.getOffset(rowOut.getColumnCount()) - rowOut.getOffset(1);
         rowOut.setRid(rowIn.getRelRid());
         fRowConst.copyField(rowOut, 0, 0);
 
-        //fRowConst.copyField(rowOut.getData()+2, 0); // hardcoded 2 for rid length
         for (uint32_t i = 1; i < rowOut.getColumnCount(); i++)
-            // WIP MCOL-641 implement copyBinaryField inside copyField
-            if (UNLIKELY(utils::isWide(rowIn.getColumnWidth(i - 1)) &&
-                         (rowIn.getColType(i - 1) == CalpontSystemCatalog::DECIMAL ||
-                          rowIn.getColType(i - 1) == CalpontSystemCatalog::UDECIMAL)))
-                rowIn.copyBinaryField(rowOut, i, i - 1);
-            else
-                rowIn.copyField(rowOut, i, i - 1);
-
-        //memcpy(rowOut.getData()+rowOut.getOffset(1), rowIn.getData()+2, n);
+            rowIn.copyField(rowOut, i, i - 1);
     }
 }
 
diff --git a/utils/rowgroup/rowaggregation.cpp b/utils/rowgroup/rowaggregation.cpp
index ad5d02233..f740f6e01 100755
--- a/utils/rowgroup/rowaggregation.cpp
+++ b/utils/rowgroup/rowaggregation.cpp
@@ -1298,7 +1298,7 @@ void RowAggregation::doMinMax(const Row& rowIn, int64_t colIn, int64_t colOut, i
         case execplan::CalpontSystemCatalog::DECIMAL:
         case execplan::CalpontSystemCatalog::UDECIMAL:
         {
-            if (LIKELY(fRow.getColumnWidth(colIn) == datatypes::MAXDECIMALWIDTH))
+            if (LIKELY(rowIn.getColumnWidth(colIn) == datatypes::MAXDECIMALWIDTH))
             {
                 updateIntMinMax(rowIn.getBinaryField<int128_t>(colIn),
                     fRow.getBinaryField<int128_t>(colOut),
diff --git a/utils/rowgroup/rowgroup.h b/utils/rowgroup/rowgroup.h
index 7cda3a60a..179493bb8 100644
--- a/utils/rowgroup/rowgroup.h
+++ b/utils/rowgroup/rowgroup.h
@@ -1203,19 +1203,32 @@ inline void Row::copyField(Row& out, uint32_t destIndex, uint32_t srcIndex) cons
     if (UNLIKELY(types[srcIndex] == execplan::CalpontSystemCatalog::VARBINARY ||
                  types[srcIndex] == execplan::CalpontSystemCatalog::BLOB ||
                  types[srcIndex] == execplan::CalpontSystemCatalog::TEXT))
+    {
         out.setVarBinaryField(getVarBinaryStringField(srcIndex), destIndex);
+    }
     else if (UNLIKELY(isLongString(srcIndex)))
+    {
         out.setStringField(getStringPointer(srcIndex), getStringLength(srcIndex), destIndex);
-    //out.setStringField(getStringField(srcIndex), destIndex);
+    }
     else if (UNLIKELY(isShortString(srcIndex)))
+    {
         out.setUintField(getUintField(srcIndex), destIndex);
+    }
     else if (UNLIKELY(types[srcIndex] == execplan::CalpontSystemCatalog::LONGDOUBLE))
+    {
         out.setLongDoubleField(getLongDoubleField(srcIndex), destIndex);
+    }
+    else if (UNLIKELY(datatypes::Decimal::isWideDecimalType(
+        types[srcIndex], colWidths[srcIndex])))
+    {
+        copyBinaryField(out, destIndex, srcIndex);
+    }
     else
+    {
         out.setIntField(getIntField(srcIndex), destIndex);
+    }
 }
 
-// WIP MCOL-641
 inline void Row::copyBinaryField(Row& out, uint32_t destIndex, uint32_t srcIndex) const
 {
     out.setBinaryField(getBinaryField<int128_t>(srcIndex), 16, destIndex);
@@ -1922,20 +1935,30 @@ inline void copyRow(const Row& in, Row* out, uint32_t colCount)
                      in.getColTypes()[i] == execplan::CalpontSystemCatalog::BLOB ||
                      in.getColTypes()[i] == execplan::CalpontSystemCatalog::TEXT ||
                      in.getColTypes()[i] == execplan::CalpontSystemCatalog::CLOB))
+        {
             out->setVarBinaryField(in.getVarBinaryStringField(i), i);
+        }
         else if (UNLIKELY(in.isLongString(i)))
-            //out->setStringField(in.getStringField(i), i);
+        {
             out->setStringField(in.getStringPointer(i), in.getStringLength(i), i);
+        }
         else if (UNLIKELY(in.isShortString(i)))
+        {
             out->setUintField(in.getUintField(i), i);
+        }
         else if (UNLIKELY(in.getColTypes()[i] == execplan::CalpontSystemCatalog::LONGDOUBLE))
+        {
             out->setLongDoubleField(in.getLongDoubleField(i), i);
-        else if (UNLIKELY((in.getColType(i) == execplan::CalpontSystemCatalog::DECIMAL ||
-                           in.getColType(i) == execplan::CalpontSystemCatalog::UDECIMAL) &&
-                           in.getColumnWidth(i) == datatypes::MAXDECIMALWIDTH))
+        }
+        else if (UNLIKELY(datatypes::Decimal::isWideDecimalType(
+            in.getColType(i), in.getColumnWidth(i))))
+        {
             in.copyBinaryField(*out, i, i);
+        }
         else
+        {
             out->setIntField(in.getIntField(i), i);
+        }
     }
 }