Answer by Ravi for How can I change column types in Spark SQL's DataFrame?

In case if you want to change multiple columns of a specific type to another without specifying individual column names

/* Get names of all columns that you want to change type. In this example I want to change all columns of type Array to String*/    val arrColsNames = originalDataFrame.schema.fields.filter(f => f.dataType.isInstanceOf[ArrayType]).map(_.name)//iterate columns you want to change type and cast to the required typeval updatedDataFrame = arrColsNames.foldLeft(originalDataFrame){(tempDF, colName) => tempDF.withColumn(colName, tempDF.col(colName).cast(DataTypes.StringType))}//displayupdatedDataFrame.show(truncate = false)