[HOTFIX] fix error describe of decimal
[HOTFIX] fix error describe of decimal

fix error describe of decimal

This closes #3204

zzcclp/carbondata,jackylk/incubator-carbondata,zzcclp/carbondata,jackylk/incubator-carbondata,zzcclp/carbondata,zzcclp/carbondata,jackylk/incubator-carbondata,jackylk/incubator-carbondata,zzcclp/carbondata