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[SPARK-21083][SQL] Store zero size and row count when analyzing empty…
… table ## What changes were proposed in this pull request? We should be able to store zero size and row count after analyzing empty table. This pr also enhances the test cases for re-analyzing tables. ## How was this patch tested? Added a new test case and enhanced some test cases. Author: Zhenhua Wang <wangzhenhua@huawei.com> Closes #18292 from wzhfy/analyzeNewColumn.
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