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Commit 582e5a24 authored by q00251598's avatar q00251598 Committed by Michael Armbrust
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[SPARK-6040][SQL] Fix the percent bug in tablesample 

HiveQL expression like `select count(1) from src tablesample(1 percent);` means take 1% sample to select. But it means 100% in the current version of the Spark.

Author: q00251598 <qiyadong@huawei.com>

Closes #4789 from watermen/SPARK-6040 and squashes the following commits:

2453ebe [q00251598] check and adjust the fraction.
parent 3f9def81
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