sample operator takes effect after the execution of the query, expected before #6340
Last updated: 2017-08-02 10:21:31 +0200
Date: 2017-07-05 11:56:48 +0200
User-Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:54.0) Gecko/20100101 Firefox/54.0
Tried to run the tpch 03 query, taking a 10% sample on each table,
Steps to Reproduce:
1.Setup tpch with sf10
Date: 2017-07-05 18:33:37 +0200
indeed the sample operator (like limit) does it job on top of the result. Sampling per input should be done by hand.
Date: 2017-07-06 11:14:36 +0200
Yeah, we got that sampling the base tables requires some manual work.
But how about the combined use of SAMPLE and LIMIT? Shouldn't SAMPLE be executed before LIMIT? Or should we actually disallow their combined use, since they both reduce the result set, only using different algorithms?
Date: 2017-08-02 10:21:31 +0200
Fixed in Jul2017-SP1 release.
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