Read keys from List

[rjaikanth-rzpy]

I am writing a Dataframe to Redis in the following manner -

import org.apache.spark.sql.SaveMode
import org.apache.spark.sql.Encoders
import spark.implicits._

case class Person(name: String, age: Int)
val personSeq = (1 to 1000).map(x => Person(s"John_$x", x + 5))
val mySchema = Encoders.product[Person].schema
val df = spark.createDataFrame(personSeq)
(df.write
  .format("org.apache.spark.sql.redis")
  .option("key.column", "name")
  .option("table", "person")
  .mode("overwrite") 
  .save()
)

How to read a collection of arbitrary keys. Example -

val baseKeysToRead = List("John_1", "John_69", "John_669", "John_123")

I just want these. One option is to read all the data and join later to reduce the size, but I do not want to do that. Please give me another option where I read the required keys directly.