[SPARK-29063][SQL] Modify fillValue approach to support joined dataframe#25768

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xuanyuanking wants to merge 3 commits intoapache:masterfrom

xuanyuanking:SPARK-29063

Commits on Sep 12, 2019

Modify fillValue approach to support joined dataframe
xuanyuanking
committed

Commits on Sep 17, 2019

Add test for checking ambiguous field
xuanyuanking
committed

Commits on Sep 20, 2019

simplify
gatorsmile
authored