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[SPARK-19058][SQL] fix partition related behaviors with DataFrameWrit…
…er.saveAsTable ## What changes were proposed in this pull request? When we append data to a partitioned table with `DataFrameWriter.saveAsTable`, there are 2 issues: 1. doesn't work when the partition has custom location. 2. will recover all partitions This PR fixes them by moving the special partition handling code from `DataSourceAnalysis` to `InsertIntoHadoopFsRelationCommand`, so that the `DataFrameWriter.saveAsTable` code path can also benefit from it. ## How was this patch tested? newly added regression tests Author: Wenchen Fan <wenchen@databricks.com> Closes apache#16460 from cloud-fan/append.
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