Jinchul 4feb4f3a54 IMPALA-5754: Improve randomness of rand()/random() ...

Currently implementation of rand/random built-in functions
use rand_r of C library. We recognized its randomness was poor.
pcg32 of third party library shows better randomness than rand_r.

Testing:
Revise unit test in expr-test
Add E2E test to random.test

Change-Id: Idafdd5fe7502ff242c76a91a815c565146108684
Reviewed-on: http://gerrit.cloudera.org:8080/8355
Reviewed-by: Jim Apple <jbapple-impala@apache.org>
Tested-by: Impala Public Jenkins

2017-12-13 10:04:40 +00:00

1.9 KiB

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