[SPARK-14127][SQL] Makes 'DESC [EXTENDED|FORMATTED] <table>' support data source tables#12934

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liancheng wants to merge 2 commits intoapache:masterfrom

liancheng:spark-14127-desc-table-follow-up

Commits on May 6, 2016

Makes 'DESC [EXTENDED|FORMATTED] <table>' support data source tables
liancheng
committed

Commits on May 9, 2016

Should also support temporary tables
liancheng
committed