title: Biquery table data performance
body: <p>In <strong>BigQuery</strong> I have a table storing 237 GB data. I don't have any columns on which i can create partition as it does not store any date fields
  When I am using it in the query the processing says 77 GB data will be processed but in bytes shuffled i see 7 GB data.
  what is the actual GB of data processed here?
  is there any way i could restructure this table ?</p>