Running tests uses 50.1GB on Ubuntu about datafusion HOT 5 OPEN

I got 28GB after cargo clean and cargo t on macbook

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On Ubuntu,

$ lsb_release -rc
Release:	22.04
Codename:	jammy

After cargo clean and running cargo t:

$ du -h -d2 target
4.0K	target/tmp
6.1G	target/debug/incremental
12M	target/debug/.fingerprint
337M	target/debug/build
16G	target/debug/deps
28G	target/debug/examples
50G	target/debug
50G	target

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Yeah, I think this obscene use of temp space is an artifact of rust (rather than an artifact of datafusion specifically)

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Not sure what I've done (except run tests more times):

Update, not using 103GB.

Seeing this nice error:

...
   Compiling datafusion v39.0.0 (/home/samuel/code/datafusion/datafusion/core)
error: failed to write to `/home/samuel/code/datafusion/target/debug/deps/rmetalvEs2G/lib.rmeta`: No space left on device (os error 28)

error: could not compile `datafusion` (lib) due to 1 previous error

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The more you run, the more artifacts in /target is. cargo clean is all you need.

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