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Class UnionMerge

Implements the UNION Merge rule: all SPARQL UNION clauses in the same group pattern should be merged as one single UNION clause.

author

Thomas Minier

Hierarchy

Index

Methods

Methods

visit

  • visit(node: PlanNode): PlanNode

  • Visit all nodes starting from this one, using a depth-first traversal, and transform them.

    Parameters

    • node: PlanNode

      Root of the expression tree to traverse

    Returns PlanNode

    The transformed expression tree

visitBGP

  • visitBGP(node: BGPNode): PlanNode

  • Visit and transform a Basic Graph Pattern node. By default, peform no transformation on the node.

    Parameters

    • node: BGPNode

      Basic Graph Pattern node

    Returns PlanNode

    The transformed Basic Graph Pattern node

visitBind

  • visitBind(node: BindNode): PlanNode

  • Visit and transform a SPARQL BIND node. By default, peform no transformation on the node.

    Parameters

    • node: BindNode

      SPARQL BIND node

    Returns PlanNode

    The transformed SPARQL BIND node

visitFilter

  • visitFilter(node: FilterNode): PlanNode

  • Visit and transform a SPARQL FILTER node. By default, peform no transformation on the node.

    Parameters

    • node: FilterNode

      SPARQL FILTER node

    Returns PlanNode

    The transformed SPARQL FILTER node

visitGraph

  • visitGraph(node: GraphNode): PlanNode

  • Visit and transform a SPARQL GRAPH node. By default, recursively transform all members of the GRAPH.

    Parameters

    • node: GraphNode

      SPARQL GRAPH node

    Returns PlanNode

    The transformed SPARQL GRAPH node

visitGroup

  • visitGroup(node: GroupNode): PlanNode

  • Visit and transform a SPARQL Group pattern node. By default, recursively transform all members of the group.

    Parameters

    • node: GroupNode

      SPARQL Group pattern node

    Returns PlanNode

    The transformed SPARQL Group pattern node

visitOptional

  • visitOptional(node: GroupNode): PlanNode

  • Visit and transform a SPARQL OPTIONAL node. By default, recursively transform all members of the OPTIONAL.

    Parameters

    • node: GroupNode

      SPARQL OPTIONAL node

    Returns PlanNode

    The transformed SPARQL OPTIONAL node

visitService

  • visitService(node: ServiceNode): PlanNode

  • Visit and transform a SPARQL SERVICE node. By default, recursively transform all members of the SERVICE.

    Parameters

    • node: ServiceNode

      SPARQL SERVICE node

    Returns PlanNode

    The transformed SPARQL SERVICE node

visitUnion

  • visitUnion(node: GroupNode): PlanNode

visitValues

  • visitValues(node: ValuesNode): PlanNode

  • Visit and transform a SPARQL VALUES node. By default, peform no transformation on the node.

    Parameters

    • node: ValuesNode

      SPARQL VALUES node

    Returns PlanNode

    The transformed SPARQL VALUES node

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