Sqlplus Set Heading not Working

Shell Programming and Scripting
1

Hello,
Could someone tell me why this still returns headings?

echo "SELECT columnA from tableA  group by columnA;" | 
sqlplus -s ${DB_CONNECT} 
set heading OFF  | 
while read line
do
     arr[$i]="$line"
echo ${arr[${i}]}
     let i=$i+1


done
2 
echo "set head off;
SELECT columnA from tableA group by columnA;" | sqlplus -s ${DB_CONNECT}
3

Thanks this worked!