我正在尝试使用Hive自定义项 date_format() 提取一周中的某一天，但它只返回 NA . 让我们看一个例子

sc <- sparklyr::spark_connect(master = "local")
df <- dplyr::copy_to(
  sc,
  data.frame(date = as.POSIXct("2020-01-01")),
  "df"
)
df

# # Source: spark<df> [?? x 1]

# date

# <dttm>

# 1 2019-12-31 23:00:00

# Extracting the year works fine...

dplyr::mutate_at(
  .tbl = df,
  .vars = "date",
  .funs = ~date_format(., "yyyy")
)

# # Source: spark<?> [?? x 1]

# date

# <chr>

# 1 2020

# But extracting the day of the week does not...

dplyr::mutate_at(
  .tbl = df,
  .vars = "date",
  .funs = ~date_format(., "E")
)

# # Source: spark<?> [?? x 1]

# date

# <chr>

# 1 NA

任何帮助都将不胜感激。一些系统信息：
mac os 10.15.7版
Spark3.0.1
第1.5.1条