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org.apache.spark.sql.catalyst.plans.logical

LogicalPlanIntegrity

object LogicalPlanIntegrity

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  5. def checkIfExprIdsAreGloballyUnique(plan: LogicalPlan): Boolean

    This method checks if the same ExprId refers to an unique attribute in a plan tree.

    This method checks if the same ExprId refers to an unique attribute in a plan tree. Some plan transformers (e.g., RemoveNoopOperators) rewrite logical plans based on this assumption.

  6. def checkIfSameExprIdNotReused(plan: LogicalPlan): Boolean

    This method checks if reference ExprIds are not reused when assigning a new ExprId.

    This method checks if reference ExprIds are not reused when assigning a new ExprId. For example, it returns false if plan transformers create an alias having the same ExprId with one of reference attributes, e.g., a#1 + 1 AS a#1.

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  12. def hasUniqueExprIdsForOutput(plan: LogicalPlan): Boolean

    Since some logical plans (e.g., Union) can build AttributeReferences in their output, this method checks if the same ExprId refers to attributes having the same data type in plan output.

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