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Commit b8a743b6 authored by Wang Gengliang's avatar Wang Gengliang Committed by Wenchen Fan
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[SPARK-21174][SQL] Validate sampling fraction in logical operator level

## What changes were proposed in this pull request?

Currently the validation of sampling fraction in dataset is incomplete.
As an improvement, validate sampling fraction in logical operator level:
1) if with replacement: fraction should be nonnegative
2) else: fraction should be on interval [0, 1]
Also add test cases for the validation.

## How was this patch tested?
integration tests

gatorsmile cloud-fan
Please review http://spark.apache.org/contributing.html before opening a pull request.

Author: Wang Gengliang <ltnwgl@gmail.com>

Closes #18387 from gengliangwang/sample_ratio_validate.
parent 5b5a69be
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