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t

org.apache.spark.sql.delta

SubqueryTransformerHelper

trait SubqueryTransformerHelper extends AnyRef

Trait to allow processing a special transformation of SubqueryExpression instances in a query plan.

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PreprocessTableWithDVs, PreprocessTableWithDVsStrategy, PrepareDeltaScan, PrepareDeltaScanBase
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  12. def isSubqueryRoot(plan: LogicalPlan): Boolean

    Is the give plan a subquery root.

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  18. def transformWithSubqueries(plan: LogicalPlan)(rule: PartialFunction[LogicalPlan, LogicalPlan]): LogicalPlan

    Transform all nodes matched by the rule in the query plan rooted at given plan.

    Transform all nodes matched by the rule in the query plan rooted at given plan. It traverses the tree starting from the leaves, whenever a SubqueryExpression expression is encountered, given rule is applied to the subquery plan plan in SubqueryExpression starting from the plan root until leaves.

    This is slightly different behavior compared to QueryPlan.transformUpWithSubqueries or QueryPlan.transformDownWithSubqueries

    It requires that the given plan already gone through OptimizeSubqueries and the root node denoting a subquery is removed and optimized appropriately.

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