我有一个Dataframe df 有四列 id , ts , lat 以及 lon . 如果我跑了 df.schema() 在调试模式下，我得到

0 = {StructField@13126} "StructField(id,LongType,true)"
  name = "id"
  dataType = {LongType$@12993} "LongType"
  nullable = true
  metadata = {Metadata@13065} "{"encoding":"UTF-8"}"
 1 = {StructField@13127} "StructField(ts,LongType,true)"
  name = "timestamp"
  dataType = {LongType$@12993} "LongType"
  nullable = true
  metadata = {Metadata@13069} "{"encoding":"UTF-8"}"
 2 = {StructField@13128} "StructField(lat,DoubleType,true)"
  name = "position_lat"
  dataType = {DoubleType$@13034} "DoubleType"
  nullable = true
  metadata = {Metadata@13073} "{"encoding":"UTF-8"}"
 3 = {StructField@13129} "StructField(lon,DoubleType,true)"
  name = "position_lon"
  dataType = {DoubleType$@13034} "DoubleType"
  nullable = true
  metadata = {Metadata@13076} "{"encoding":"UTF-8"}"

现在，我想去掉所有的元数据。 "{"encoding":"ZSTD"}" 应该由替换 "" 对于每列。请注意，我的实际表有许多列，因此解决方案需要有点通用性。提前谢谢！