Class

org.apache.spark.sql.cassandra

BasicCassandraPredicatePushDown

Related Doc: package cassandra

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class BasicCassandraPredicatePushDown[Predicate] extends AnyRef

Determines which filter predicates can be pushed down to Cassandra.

  1. Only push down no-partition key column predicates with =, >, <, >=, <= predicate 2. Only push down primary key column predicates with = or IN predicate. 3. If there are regular columns in the pushdown predicates, they should have at least one EQ expression on an indexed column and no IN predicates. 4. All partition column predicates must be included in the predicates to be pushed down, any part of the partition key can be an EQ or IN predicate. For each partition column, only one predicate is allowed. 5. For cluster column predicates, only last predicate can be RANGE predicate and preceding column predicates must be EQ or IN predicates. If there is only one cluster column predicate, the predicates could be EQ or IN or RANGE predicate. 6. There is no pushdown predicates if there is any OR condition or NOT IN condition. 7. We're not allowed to push down multiple predicates for the same column if any of them is equality or IN predicate.

The list of predicates to be pushed down is available in predicatesToPushDown property. The list of predicates that cannot be pushed down is available in predicatesToPreserve property.

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Instance Constructors

  1. new BasicCassandraPredicatePushDown(predicates: Set[Predicate], table: TableDef, pv: ProtocolVersion = ProtocolVersion.NEWEST_SUPPORTED)(implicit arg0: PredicateOps[Predicate])

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    predicates

    list of filter predicates available in the user query

    table

    Cassandra table definition

Value Members

  1. final def !=(arg0: Any): Boolean

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  2. final def ##(): Int

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  3. def +(other: String): String

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    Implicit information
    This member is added by an implicit conversion from BasicCassandraPredicatePushDown[Predicate] to any2stringadd[BasicCassandraPredicatePushDown[Predicate]] performed by method any2stringadd in scala.Predef.
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    any2stringadd
  4. def ->[B](y: B): (BasicCassandraPredicatePushDown[Predicate], B)

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    Implicit information
    This member is added by an implicit conversion from BasicCassandraPredicatePushDown[Predicate] to ArrowAssoc[BasicCassandraPredicatePushDown[Predicate]] performed by method ArrowAssoc in scala.Predef.
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    @inline()
  5. final def ==(arg0: Any): Boolean

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  6. final def asInstanceOf[T0]: T0

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  7. def clone(): AnyRef

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    @throws( ... )
  8. def ensuring(cond: (BasicCassandraPredicatePushDown[Predicate]) ⇒ Boolean, msg: ⇒ Any): BasicCassandraPredicatePushDown[Predicate]

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    Implicit information
    This member is added by an implicit conversion from BasicCassandraPredicatePushDown[Predicate] to Ensuring[BasicCassandraPredicatePushDown[Predicate]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  9. def ensuring(cond: (BasicCassandraPredicatePushDown[Predicate]) ⇒ Boolean): BasicCassandraPredicatePushDown[Predicate]

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    Implicit information
    This member is added by an implicit conversion from BasicCassandraPredicatePushDown[Predicate] to Ensuring[BasicCassandraPredicatePushDown[Predicate]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  10. def ensuring(cond: Boolean, msg: ⇒ Any): BasicCassandraPredicatePushDown[Predicate]

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    Implicit information
    This member is added by an implicit conversion from BasicCassandraPredicatePushDown[Predicate] to Ensuring[BasicCassandraPredicatePushDown[Predicate]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  11. def ensuring(cond: Boolean): BasicCassandraPredicatePushDown[Predicate]

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    Implicit information
    This member is added by an implicit conversion from BasicCassandraPredicatePushDown[Predicate] to Ensuring[BasicCassandraPredicatePushDown[Predicate]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  12. final def eq(arg0: AnyRef): Boolean

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  13. def equals(arg0: Any): Boolean

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  14. def finalize(): Unit

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  15. def formatted(fmtstr: String): String

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    This member is added by an implicit conversion from BasicCassandraPredicatePushDown[Predicate] to StringFormat[BasicCassandraPredicatePushDown[Predicate]] performed by method StringFormat in scala.Predef.
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  16. final def getClass(): Class[_]

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  17. def hashCode(): Int

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  18. final def isInstanceOf[T0]: Boolean

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  19. final def ne(arg0: AnyRef): Boolean

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  20. final def notify(): Unit

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  21. final def notifyAll(): Unit

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  22. val predicatesToPreserve: Set[Predicate]

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    Returns the set of predicates that cannot be pushed down to Cassandra, so they must be applied by Spark

  23. val predicatesToPushDown: Set[Predicate]

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    Returns the set of predicates that can be safely pushed down to Cassandra

  24. val pvOrdering: Ordering[ProtocolVersion]

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  25. final def synchronized[T0](arg0: ⇒ T0): T0

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  26. val timeUUIDNonEqual: IndexedSeq[Predicate]

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    All non-equal predicates on a TimeUUID column are going to fail and fail in silent way.

    All non-equal predicates on a TimeUUID column are going to fail and fail in silent way. The basic issue here is that when you use a comparison on a time UUID column in C* it compares based on the Time portion of the UUID. When Spark executes this filter (unhandled behavior) it will compare lexically, this will lead to results being incorrectly filtered out of the set. As long as the range predicate is handled completely by the connector the correct result will be obtained.

  27. def toString(): String

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  28. val unhandledTimeUUIDNonEqual: Set[Predicate]

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  29. final def wait(): Unit

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  30. final def wait(arg0: Long, arg1: Int): Unit

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  31. final def wait(arg0: Long): Unit

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  32. def [B](y: B): (BasicCassandraPredicatePushDown[Predicate], B)

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    Implicit information
    This member is added by an implicit conversion from BasicCassandraPredicatePushDown[Predicate] to ArrowAssoc[BasicCassandraPredicatePushDown[Predicate]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd from BasicCassandraPredicatePushDown[Predicate] to any2stringadd[BasicCassandraPredicatePushDown[Predicate]]

Inherited by implicit conversion StringFormat from BasicCassandraPredicatePushDown[Predicate] to StringFormat[BasicCassandraPredicatePushDown[Predicate]]

Inherited by implicit conversion Ensuring from BasicCassandraPredicatePushDown[Predicate] to Ensuring[BasicCassandraPredicatePushDown[Predicate]]

Inherited by implicit conversion ArrowAssoc from BasicCassandraPredicatePushDown[Predicate] to ArrowAssoc[BasicCassandraPredicatePushDown[Predicate]]

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