Github user titicaca commented on the issue: https://github.com/apache/spark/pull/16689 I tried to modify the PRIMITIVE_TYPES for timestamp, but it had a side effect on coltypes method. In test_sparkSQL.R#2262, `expect_equal(coltypes(DF), c("integer", "logical", "POSIXct"))`, coltypes return a list instead of a vector because of the convertion from timestamp to `c(POSIXct, POSIXt)`
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