paste() is translated as concat_ws which is not a function in redshift. It uses either the concat function or the || operator. Similiar issue to #155 .
df %>% mutate(month_year= paste(year, month))
#> Error in new_result(connection@ptr, statement, immediate): nanodbc/nanodbc.cpp:1374: 00000: [Amazon][Amazon Redshift] (30) Error occurred while trying to execute a query: [SQLState 42883] ERROR: function concat_ws("unknown", character varying, character varying) does not exist#> HINT: No function matches the given name and argument types. You may need to add explicit type casts.#>
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