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when I query to the external table that `LOCATION` is hdfs,

I don’t make sense that where dose greenplum retain data(including tmp).

is that any rule to hold data in greenplum?

for instance

1.a lot of data : gp’s hdd

2.little data : gp’s memory

3.No,do not retain in gp at all.gp just display them.

4.etc…

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