{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/89408561","pull_request_review_id":9954336,"id":89408561,"diff_hunk":"@@ -117,7 +117,7 @@ case class CreateDataSourceTableCommand(table: CatalogTable, ignoreIfExists: Boo\n  */\n case class CreateDataSourceTableAsSelectCommand(\n     table: CatalogTable,\n-    mode: SaveMode,\n+    ignoreIfExists: Boolean,","path":"sql/core/src/main/scala/org/apache/spark/sql/execution/command/createDataSourceTables.scala","position":5,"original_position":5,"commit_id":"7f90a100d8122531a3f668a0bf442883f92f98e0","original_commit_id":"7f90a100d8122531a3f668a0bf442883f92f98e0","user":{"login":"gatorsmile","id":11567269,"avatar_url":"https://avatars.githubusercontent.com/u/11567269?v=3","gravatar_id":"","url":"https://api.github.com/users/gatorsmile","html_url":"https://github.com/gatorsmile","followers_url":"https://api.github.com/users/gatorsmile/followers","following_url":"https://api.github.com/users/gatorsmile/following{/other_user}","gists_url":"https://api.github.com/users/gatorsmile/gists{/gist_id}","starred_url":"https://api.github.com/users/gatorsmile/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gatorsmile/subscriptions","organizations_url":"https://api.github.com/users/gatorsmile/orgs","repos_url":"https://api.github.com/users/gatorsmile/repos","events_url":"https://api.github.com/users/gatorsmile/events{/privacy}","received_events_url":"https://api.github.com/users/gatorsmile/received_events","type":"User","site_admin":false},"body":"This is a good change, I like it! Now it is identical to the interface `CreateHiveTableAsSelectCommand`. Maybe we can copy the params here. ","created_at":"2016-11-23T22:21:30Z","updated_at":"2016-11-23T22:21:30Z","html_url":"https://github.com/apache/spark/pull/15996#discussion_r89408561","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/15996","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/89408561"},"html":{"href":"https://github.com/apache/spark/pull/15996#discussion_r89408561"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/15996"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/15996","id":95053637,"html_url":"https://github.com/apache/spark/pull/15996","diff_url":"https://github.com/apache/spark/pull/15996.diff","patch_url":"https://github.com/apache/spark/pull/15996.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/15996","number":15996,"state":"open","locked":false,"title":"[SPARK-18567][SQL][WIP] Simplify CreateDataSourceTableAsSelectCommand","user":{"login":"cloud-fan","id":3182036,"avatar_url":"https://avatars.githubusercontent.com/u/3182036?v=3","gravatar_id":"","url":"https://api.github.com/users/cloud-fan","html_url":"https://github.com/cloud-fan","followers_url":"https://api.github.com/users/cloud-fan/followers","following_url":"https://api.github.com/users/cloud-fan/following{/other_user}","gists_url":"https://api.github.com/users/cloud-fan/gists{/gist_id}","starred_url":"https://api.github.com/users/cloud-fan/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cloud-fan/subscriptions","organizations_url":"https://api.github.com/users/cloud-fan/orgs","repos_url":"https://api.github.com/users/cloud-fan/repos","events_url":"https://api.github.com/users/cloud-fan/events{/privacy}","received_events_url":"https://api.github.com/users/cloud-fan/received_events","type":"User","site_admin":false},"body":"## What changes were proposed in this pull request?\r\n\r\nThe `CreateDataSourceTableAsSelectCommand` is quite complex now, as it has a lot of work to do if the table already exists:\r\n\r\n1. throw exception if we don't want to ignore it.\r\n2. do some check and adjust the schema if we want to append data.\r\n3. drop the table and create it again if we want to overwrite.\r\n\r\nThe work 2 and 3 are required by `DataFrameWriter` only, I think it's more reasonable to put them in `DataFrameWriter`, to simplify `CreateDataSourceTableAsSelectCommand`. Then `saveAsTable` can work with hive table in append mode.\r\n\r\nBehaviour changes:\r\n\r\n1. Previously we will throw an exception if the provider given by `DataFrameWriter` doesn't match the provider of the existing provider. This is annoying because `DataFrameWriter` use parquet provider by default, and users have to specify the provider of the table they want to append data to. After this PR, we will simply ignore the provider while appending data to existing tables.(we can back the the previous behavior if you think it makes sense)\r\n\r\n## How was this patch tested?\r\n\r\nexisting 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