text: -- based on https://github.com/ioguix/pgsql-bloat-estimation/blob/master/table/table_bloat.sql
  
  -- current_database: name of the current database.
  -- schemaname: schema of the table.
  -- tblname: the table name.
  -- real_size: real size of the table.
  -- extra_size: estimated extra size not used/needed in the table. This extra size is composed by the fillfactor, bloat and alignment padding spaces.
  -- extra_ratio: estimated ratio of the real size used by extra_size.
  -- fillfactor: the fillfactor of the table.
  -- bloat_size: estimated size of the bloat without the extra space kept for the fillfactor.
  -- bloat_ratio: estimated ratio of the real size used by bloat_size.
  -- is_na: is the estimation "Not Applicable" ? If true, do not trust the stats.
  
  select * from table_bloats;