[SPARK-10044][SQL]Fix bug AnalysisException in resolving reference for sorting with agg…#8234

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chenghao-intel wants to merge 2 commits intoapache:masterfrom

chenghao-intel:resolve_sort

Commits on Aug 17, 2015

fix bug AnalysisException in resolving reference for sorting with aggregation
chenghao-intel
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give unique name for internal alias
chenghao-intel
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