Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/16552
The overall idea is to use `InsertIntable` to implement appending to hive
table, but this approach is too hacky, we should follow the way how we deal
with data source table, e.g. `DataFrameWriter.saveAsTable` just build a
`CreateTable` plan, rule `AnalyzeCreateTable` do some checking and
normalization, and another rule turn `CreateTable` into
`CreateDataSourceTableAsSelectCommand`.
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