查询多个表时如何优化bigquery？

Question

我有一个表格events_20181001 till events_20181024，其格式为 projectname:some_name.events_20181024，我正在查询特定的列。

如果我在_Table_suffix和event_20181001之间使用event_20181024，则数据约为14 gb，这是巨大的，而且成本更高。如何解决/优化查询？

真正的查询如下：

select date, evname as ev1,ui.value.string_value as k1, upk1.value.string_value as k2, upk.value.string_value as k3 
from `project_name.some_name.*`,
unnest(somejsonkey) as ui,
unnest(somejsonkey) as upk, 
unnest(somejsonkey) as upk1 
where event_name = 'abc' 
and upk1.key = 'def' 
and upk.key ='ghi' 
and ui.key = 'someidentity' 
and _TABLE_SUFFIX BETWEEN 'events_20181001' AND 'events_20181024';