Some compiler warnings need fixing

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/utils/funcexp/func_div.cpp: In member function ‘virtual int64_t funcexp::Func_div::getIntVal(rowgroup::Row&, funcexp::FunctionParm&, bool&, execplan::CalpontSystemCatalog::ColType&)’:

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/utils/funcexp/func_div.cpp:58:16: warning: converting to non-pointer type ‘long int’ from NULL [-Wconversion-null]

         return NULL;

                ^~~~

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/utils/funcexp/func_div.cpp: In member function ‘virtual uint64_t funcexp::Func_div::getUintVal(rowgroup::Row&, funcexp::FunctionParm&, bool&, execplan::CalpontSystemCatalog::ColType&)’:

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/utils/funcexp/func_div.cpp:81:16: warning: converting to non-pointer type ‘uint64_t {aka long unsigned int}’ from NULL [-Wconversion-null]

         return NULL;

                ^~~~

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/utils/funcexp/func_lpad.cpp: In member function ‘virtual std::__cxx11::string funcexp::Func_lpad::getStrVal(rowgroup::Row&, funcexp::FunctionParm&, bool&, execplan::CalpontSystemCatalog::ColType&)’:

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/utils/funcexp/func_lpad.cpp:133:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]

  if(strwclen > len)

     ~~~~~~~~~^~~~~

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/utils/funcexp/func_lpad.cpp:150:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]

     if (strSize == len)

         ~~~~~~~~^~~~~~

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/utils/funcexp/func_lpad.cpp:157:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]

     if (strSize > len)

         ~~~~~~~~^~~~~

 In member function ‘virtual std::__cxx11::string funcexp::Func_rpad::getStrVal(rowgroup::Row&, funcexp::FunctionParm&, bool&, execplan::CalpontSystemCatalog::ColType&)’:

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/utils/funcexp/func_rpad.cpp:133:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]

  if(strwclen > len)

     ~~~~~~~~~^~~~~

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/utils/funcexp/func_rpad.cpp:150:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]

     if (strSize == len)

         ~~~~~~~~^~~~~~

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/utils/funcexp/func_rpad.cpp:157:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]

     if (strSize > len)

         ~~~~~~~~^~~~~

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/oam/oamcpp/liboamcpp.cpp: In member function ‘void oam::Oam::sendStatusUpdate(messageqcpp::ByteStream, messageqcpp::ByteStream::byte)’:

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/oam/oamcpp/liboamcpp.cpp:9321:28: warning: self-comparison always evaluates to true [-Wtautological-compare]

     if ( returnRequestType == returnRequestType ) {

          ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/primitives/blockcache/filebuffer.cpp: In copy constructor ‘dbbc::FileBuffer::FileBuffer(const dbbc::FileBuffer&)’:

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/primitives/blockcache/filebuffer.cpp:41:2: warning: nonnull argument ‘this’ compared to NULL [-Wnonnull-compare]

  if (this==NULL || this==&rhs)

  ^~

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/dbcon/mysql/is_columnstore_files.cpp: In function ‘bool get_file_sizes(int, const char*, off_t*, off_t*)’:

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/dbcon/mysql/is_columnstore_files.cpp:70:16: warning: ‘msgQueueClient’ may be used uninitialized in this function [-Wmaybe-uninitialized]

         delete msgQueueClient;

                ^~~~~~~~~~~~~~

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/dbcon/mysql/ha_calpont_impl.cpp: In function ‘int ha_calpont_impl_rnd_init(TABLE*)’:

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/dbcon/mysql/ha_calpont_impl.cpp:2432:24: warning: comparison of constant ‘0’ with boolean expression is always false [-Wbool-compare]

  if (bSystemQueryReady < 0)

      ~~~~~~~~~~~~~~~~~~^~~

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/oamapps/postConfigure/postConfigure.cpp: In function ‘int main(int, char**)’:

/home/linuxjedi/Programming/Git/mariadb-columnstore-server/mariadb-columnstore-engine/oamapps/postConfigure/postConfigure.cpp:2808:19: warning: comparison with string literal results in unspecified behavior [-Waddress]

     if ( pass1 == "exit")

                   ^~~~~~