AddMetadataColumns Logical Resolution Rule¶

AddMetadataColumns adds metadata columns to logical operators with metadata columns defined

AddMetadataColumns is a Rule to transform a LogicalPlan (Rule[LogicalPlan]).

AddMetadataColumns is part of the Resolution batch of the Analyzer.

Executing Rule¶

Signature

apply(
  plan: LogicalPlan): LogicalPlan

apply is part of the Rule abstraction.

apply adds metadata columns to logical operators (with metadata columns defined).

addMetadataCol¶

addMetadataCol(
  plan: LogicalPlan,
  requiredAttrIds: Set[ExprId]): LogicalPlan

addMetadataCol...FIXME

hasMetadataCol¶

hasMetadataCol(
  plan: LogicalPlan): Boolean

hasMetadataCol is positive (true) when there is at least one Attribute expression (among the Expressions of the given LogicalPlan) for which either holds true:

It is a metadata column
ExprId of this Attribute is among the metadata output attributes of any of the children of the given LogicalPlan