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class AttributeScopeStack extends AnyRef

The AttributeScopeStack is used to validate that the attribute which was encountered by the ExpressionResolutionValidator is in the current operator's visibility scope. We use AttributeSet as scope implementation here to check the equality of attributes based on their expression IDs.

E.g. for the following SQL query:

SELECT a, a, a + col2 FROM (SELECT col1 as a, col2 FROM VALUES (1, 2));

Having the following logical plan:

Project [a#2, a#2, (a#2 + col2#1) AS (a + col2)#3]
+- SubqueryAlias __auto_generated_subquery_name
   +- Project [col1#0 AS a#2, col2#1]
      +- LocalRelation [col1#0, col2#1]

The LocalRelation outputs attributes with IDs #0 and #1, which can be referenced by the lower Project. This Project produces a new attribute ID #2 for an alias and retains the old ID #1 for col2. The upper Project references a twice using the same ID #2 and produces a new ID #3 for an alias of a + col2.

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Instance Constructors

  1. new AttributeScopeStack()

Value Members

  1. final def !=(arg0: Any): Boolean
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  2. final def ##: Int
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  3. final def ==(arg0: Any): Boolean
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  4. final def asInstanceOf[T0]: T0
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  5. def clone(): AnyRef
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    @throws(classOf[java.lang.CloneNotSupportedException]) @IntrinsicCandidate() @native()
  6. final def eq(arg0: AnyRef): Boolean
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  7. def equals(arg0: AnyRef): Boolean
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  8. final def getClass(): Class[_ <: AnyRef]
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  9. def hashCode(): Int
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  10. final def isInstanceOf[T0]: Boolean
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  11. final def ne(arg0: AnyRef): Boolean
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  12. final def notify(): Unit
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    @IntrinsicCandidate() @native()
  13. final def notifyAll(): Unit
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    @IntrinsicCandidate() @native()
  14. def overwriteTop(attributes: Seq[Attribute]): Unit

    Overwrite current relevant scope with a sequence of attributes which is an output of some operator.

    Overwrite current relevant scope with a sequence of attributes which is an output of some operator. attributes can have duplicate IDs if the output of the operator contains multiple occurrences of the same attribute.

  15. final def synchronized[T0](arg0: => T0): T0
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  16. def toString(): String
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  17. def top: AttributeSet

    Get the relevant attribute scope in the context of the current operator.

  18. final def wait(arg0: Long, arg1: Int): Unit
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    @throws(classOf[java.lang.InterruptedException])
  19. final def wait(arg0: Long): Unit
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    @throws(classOf[java.lang.InterruptedException]) @native()
  20. final def wait(): Unit
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    @throws(classOf[java.lang.InterruptedException])
  21. def withNewScope[R](body: => R): Unit

    Execute body in the context of a fresh attribute scope.

    Execute body in the context of a fresh attribute scope. Used by Project and Aggregate validation code since those operators introduce a new scope with fresh expression IDs.

Deprecated Value Members

  1. def finalize(): Unit
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    @throws(classOf[java.lang.Throwable]) @Deprecated
    Deprecated

    (Since version 9)

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