org.apache.spark.sql.catalyst.expressions

EquivalentExpressions

class EquivalentExpressions extends AnyRef

This class is used to compute equality of (sub)expression trees. Expressions can be added to this class and they subsequently query for expression equality. Expression trees are considered equal if for the same input(s), the same result is produced.

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Instance Constructors

  1. new EquivalentExpressions()

Type Members

  1. case class Expr(e: Expression) extends Product with Serializable

    Wrapper around an Expression that provides semantic equality.

Value Members

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

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

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  3. final def ##(): Int

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  4. final def ==(arg0: AnyRef): Boolean

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  5. final def ==(arg0: Any): Boolean

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  6. def addExpr(expr: Expression): Boolean

    Adds each expression to this data structure, grouping them with existing equivalent expressions.

    Adds each expression to this data structure, grouping them with existing equivalent expressions. Non-recursive. Returns true if there was already a matching expression.

  7. def addExprTree(root: Expression, ignoreLeaf: Boolean = true): Unit

    Adds the expression to this data structure recursively.

    Adds the expression to this data structure recursively. Stops if a matching expression is found. That is, if expr has already been added, its children are not added. If ignoreLeaf is true, leaf nodes are ignored.

  8. final def asInstanceOf[T0]: T0

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  9. def clone(): AnyRef

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    protected[java.lang]
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  10. def debugString(all: Boolean = false): String

    Returns the state of the data structure as a string.

    Returns the state of the data structure as a string. If all is false, skips sets of equivalent expressions with cardinality 1.

  11. final def eq(arg0: AnyRef): Boolean

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  12. def equals(arg0: Any): Boolean

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  13. def finalize(): Unit

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    @throws( classOf[java.lang.Throwable] )

  14. def getAllEquivalentExprs: Seq[Seq[Expression]]

    Returns all the equivalent sets of expressions.

  15. final def getClass(): Class[_]

    Definition Classes
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  16. def getEquivalentExprs(e: Expression): Seq[Expression]

    Returns all of the expression trees that are equivalent to e.

    Returns all of the expression trees that are equivalent to e. Returns an empty collection if there are none.

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

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  23. def toString(): String

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  24. final def wait(): Unit

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

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

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