Description
Currently, SparkR tests, `R/run-tests.sh` succeeds only once because `test_sparkSQL.R` does not clean up the test table `people`.
As a result, the test data is accumulated at every run and the test cases fail.
The following is the failure result for the second run.
Failed ------------------------------------------------------------------------- 1. Failure: create DataFrame from RDD (@test_sparkSQL.R#204) ------------------- collect(sql("SELECT age from people WHERE name = 'Bob'"))$age not equal to c(16). Lengths differ: 2 vs 1 2. Failure: create DataFrame from RDD (@test_sparkSQL.R#206) ------------------- collect(sql("SELECT height from people WHERE name ='Bob'"))$height not equal to c(176.5). Lengths differ: 2 vs 1