[SPARK-24181][SQL] Better error message for writing sorted data#21235

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dbtsai wants to merge 3 commits intoapache:masterfrom

dbtsai:fixException

Commits on May 3, 2018

The exception message should clearly distinguish sorting and bucketing in save() and jdbc write
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Commits on May 4, 2018

Minor
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Commits on May 8, 2018

Addressed feedback
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