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• spark-cassandra-connector_2.11
• 2.3.1
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• CassandraLimit.scala

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com.datastax.spark.connector.rdd.CassandraLimit.scala Maven / Gradle / Ivy

package com.datastax.spark.connector.rdd

sealed trait CassandraLimit

case class CassandraPartitionLimit(rowsNumber: Long) extends CassandraLimit {
  require(rowsNumber > 0, s"$rowsNumber <= 0. Per Partition Limits must be greater than 0")
}
case class SparkPartitionLimit(rowsNumber: Long) extends CassandraLimit {
  require(rowsNumber > 0, s"$rowsNumber <= 0. Limits must be greater than 0")
}

object CassandraLimit {

  def limitToClause
  (limit: Option[CassandraLimit]): String = limit match {
    case Some(SparkPartitionLimit(rowsNumber)) => s"LIMIT $rowsNumber"
    case Some(CassandraPartitionLimit(rowsNumber)) => s"PER PARTITION LIMIT $rowsNumber"
    case None => ""
  }

  def limitForIterator(limit: Option[CassandraLimit]): Option[Long] = limit.collect {
    case SparkPartitionLimit(rowsNumber) => rowsNumber
  }
}