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object SubExprUtils extends PredicateHelper

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PredicateHelper, AnyRef, Any
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  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def canEvaluate(expr: Expression, plan: LogicalPlan): Boolean

    Returns true if expr can be evaluated using only the output of plan.

    Returns true if expr can be evaluated using only the output of plan. This method can be used to determine when it is acceptable to move expression evaluation within a query plan.

    For example consider a join between two relations R(a, b) and S(c, d).

    - canEvaluate(EqualTo(a,b), R) returns true - canEvaluate(EqualTo(a,c), R) returns false - canEvaluate(Literal(1), R) returns true as literals CAN be evaluated on any plan

    Attributes
    protected
    Definition Classes
    PredicateHelper
  6. def canEvaluateWithinJoin(expr: Expression): Boolean

    Returns true iff expr could be evaluated as a condition within join.

    Returns true iff expr could be evaluated as a condition within join.

    Attributes
    protected
    Definition Classes
    PredicateHelper
  7. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  8. def containsOuter(e: Expression): Boolean

    Returns true when an expression contains correlated predicates i.e outer references and returns false otherwise.

  9. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  10. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  11. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  12. def findExpressionAndTrackLineageDown(exp: Expression, plan: LogicalPlan): Option[(Expression, LogicalPlan)]

    Find the origin of where the input references of expression exp were scanned in the tree of plan, and if they originate from a single leaf node.

    Find the origin of where the input references of expression exp were scanned in the tree of plan, and if they originate from a single leaf node. Returns optional tuple with Expression, undoing any projections and aliasing that has been done along the way from plan to origin, and the origin LeafNode plan from which all the exp

    Definition Classes
    PredicateHelper
  13. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  14. def getCorrelatedPredicates(plan: LogicalPlan): Seq[Expression]

    Returns the correlated predicates from a logical plan.

    Returns the correlated predicates from a logical plan. The OuterReference wrapper is removed before returning the predicate to the caller.

  15. def getOuterReferences(plan: LogicalPlan): Seq[Expression]

    Returns all the expressions that have outer references from a logical plan.

    Returns all the expressions that have outer references from a logical plan. Currently only Filter operator can host outer references.

  16. def getOuterReferences(conditions: Seq[Expression]): Seq[Expression]

    Given a list of expressions, returns the expressions which have outer references.

    Given a list of expressions, returns the expressions which have outer references. Aggregate expressions are treated in a special way. If the children of aggregate expression contains an outer reference, then the entire aggregate expression is marked as an outer reference. Example (SQL):

    SELECT a FROM l GROUP by 1 HAVING EXISTS (SELECT 1 FROM r WHERE d < min(b))

    In the above case, we want to mark the entire min(b) as an outer reference OuterReference(min(b)) instead of min(OuterReference(b)). TODO: Currently we don't allow deep correlation. Also, we don't allow mixing of outer references and local references under an aggregate expression. For example (SQL):

    SELECT .. FROM p1
WHERE EXISTS (SELECT ...
              FROM p2
              WHERE EXISTS (SELECT ...
                            FROM sq
                            WHERE min(p1.a + p2.b) = sq.c))

SELECT .. FROM p1
WHERE EXISTS (SELECT ...
              FROM p2
              WHERE EXISTS (SELECT ...
                            FROM sq
                            WHERE min(p1.a) + max(p2.b) = sq.c))

SELECT .. FROM p1
WHERE EXISTS (SELECT ...
              FROM p2
              WHERE EXISTS (SELECT ...
                            FROM sq
                            WHERE min(p1.a + sq.c) > 1))

    The code below needs to change when we support the above cases.

  17. def hasNullAwarePredicateWithinNot(condition: Expression): Boolean

    Returns whether there are any null-aware predicate subqueries inside Not.

    Returns whether there are any null-aware predicate subqueries inside Not. If not, we could turn the null-aware predicate into not-null-aware predicate.

  18. def hasOuterReferences(plan: LogicalPlan): Boolean

    Given a logical plan, returns TRUE if it has an outer reference and false otherwise.

  19. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  20. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  21. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  22. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  23. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  24. def replaceAlias(condition: Expression, aliases: AttributeMap[Expression]): Expression
    Attributes
    protected
    Definition Classes
    PredicateHelper
  25. def splitConjunctivePredicates(condition: Expression): Seq[Expression]
    Attributes
    protected
    Definition Classes
    PredicateHelper
  26. def splitDisjunctivePredicates(condition: Expression): Seq[Expression]
    Attributes
    protected
    Definition Classes
    PredicateHelper
  27. def stripOuterReference(e: Expression): Expression

    Returns an expression after removing the OuterReference shell.

  28. def stripOuterReferences(p: LogicalPlan): LogicalPlan

    Returns the logical plan after removing the OuterReference shell from all the expressions of the input logical plan.

  29. def stripOuterReferences(e: Seq[Expression]): Seq[Expression]

    Returns the list of expressions after removing the OuterReference shell from each of the expression.

  30. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  31. def toString(): String
    Definition Classes
    AnyRef → Any
  32. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  33. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  34. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()

Inherited from PredicateHelper

Inherited from AnyRef

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