Xin Wu 1ab97310e8 [SPARK-19539][SQL] Block duplicate temp table during creation ... ## What changes were proposed in this pull request? Current `CREATE TEMPORARY TABLE ... ` is deprecated and recommend users to use `CREATE TEMPORARY VIEW ...` And it does not support `IF NOT EXISTS `clause. However, if there is an existing temporary view defined, it is possible to unintentionally replace this existing view by issuing `CREATE TEMPORARY TABLE ...` with the same table/view name. This PR is to disallow `CREATE TEMPORARY TABLE ...` with an existing view name. Under the cover, `CREATE TEMPORARY TABLE ...` will be changed to create temporary view, however, passing in a flag `replace=false`, instead of currently `true`. So when creating temporary view under the cover, if there is existing view with the same name, the operation will be blocked. ## How was this patch tested? New unit test case is added and updated some existing test cases to adapt the new behavior Author: Xin Wu <xinwu@us.ibm.com> Closes #16878 from xwu0226/block_duplicate_temp_table.		2017-02-13 19:45:58 -08:00
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main	[SPARK-19539][SQL] Block duplicate temp table during creation	2017-02-13 19:45:58 -08:00
test	[SPARK-19539][SQL] Block duplicate temp table during creation	2017-02-13 19:45:58 -08:00