6451cf9270
#### What changes were proposed in this pull request? ~~If the temp table already exists, we should not silently replace it when doing `CACHE TABLE AS SELECT`. This is inconsistent with the behavior of `CREAT VIEW` or `CREATE TABLE`. This PR is to fix this silent drop.~~ ~~Maybe, we also can introduce new syntax for replacing the existing one. For example, in Hive, to replace a view, the syntax should be like `ALTER VIEW AS SELECT` or `CREATE OR REPLACE VIEW AS SELECT`~~ The table name in `CACHE TABLE AS SELECT` should NOT contain database prefix like "database.table". Thus, this PR captures this in Parser and outputs a better error message, instead of reporting the view already exists. In addition, refactoring the `Parser` to generate table identifiers instead of returning the table name string. #### How was this patch tested? - Added a test case for caching and uncaching qualified table names - Fixed a few test cases that do not drop temp table at the end - Added the related test case for the issue resolved in this PR Author: gatorsmile <gatorsmile@gmail.com> Author: xiaoli <lixiao1983@gmail.com> Author: Xiao Li <xiaoli@Xiaos-MacBook-Pro.local> Closes #13572 from gatorsmile/cacheTableAsSelect. |
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