You did not provide a column alias to the column “SUM (NR_LOG_READS)”, so Oracle used your comment as the column name. Best practice should always be to name your columns.
So this:
SUM (NR_LOG_READS)
--,DBMS_LOB.SUBSTR (SQL_TEXT, 220)
--,DBMS_LOB.SUBSTR (SQL_TEXT, 220)
Should be turned into this (or something like this):
SUM (NR_LOG_READS)SUM_NR_LOG_READS
--,DBMS_LOB.SUBSTR (SQL_TEXT, 220)
--,DBMS_LOB.SUBSTR (SQL_TEXT, 220)
Thanks
David