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

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A library that exposes YugaByte DB tables as Spark RDDs, writes Spark RDDs to YugaByte DB tables, and executes CQL queries in Spark applications using YugaByte DB's Cassandra-compatible API.

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package com.datastax.spark.connector.rdd

/** Represents a logical conjunction of CQL predicates.
  * Each predicate can have placeholders denoted by '?' which get substituted by values from the `values` array.
  * The number of placeholders must match the size of the `values` array. */
case class CqlWhereClause(predicates: Seq[String], values: Seq[Any]) {

  /** Returns a conjunction of this clause and the given predicate. */
  def and(other: CqlWhereClause) =
    CqlWhereClause(predicates ++ other.predicates, values ++ other.values)

}

object CqlWhereClause {

  /** Empty CQL WHERE clause selects all rows */
  val empty = new CqlWhereClause(Nil, Nil)
}