Github user sddyljsx commented on the issue:
https://github.com/apache/spark/pull/21859
We may not know in advance how big this query is. The data at the beginning
is large, but it may be very small after filtering.
I encountered this problem while using thrift server for queries. The
program will query the sorted abnormal orders from the order table through
jdbc every day, the sql is 'select * from order where order_status = 4 and
order_time = 20180820 order by order_id '. The number of abnormal orders is
small. It will be very inconvenient to cache the table using jdbc.
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