Module datafusion::logical_expr::logical_plan::tree_node

TreeNode based visiting and rewriting for LogicalPlans

Visiting (read only) APIs

• LogicalPlan::visit: recursively visit the node and all of its inputs
• LogicalPlan::visit_with_subqueries: recursively visit the node and all of its inputs, including subqueries
• LogicalPlan::apply_children: recursively visit all inputs of this node
• LogicalPlan::apply_expressions: (non recursively) visit all expressions of this node
• LogicalPlan::apply_subqueries: (non recursively) visit all subqueries of this node
• LogicalPlan::apply_with_subqueries: recursively visit all inputs and embedded subqueries.

Rewriting (update) APIs:

• LogicalPlan::exists: search for an expression in a plan
• LogicalPlan::rewrite: recursively rewrite the node and all of its inputs
• LogicalPlan::map_children: recursively rewrite all inputs of this node
• LogicalPlan::map_expressions: (non recursively) visit all expressions of this node
• LogicalPlan::map_subqueries: (non recursively) rewrite all subqueries of this node
• LogicalPlan::rewrite_with_subqueries: recursively rewrite the node and all of its inputs, including subqueries

(Re)creation APIs (these require substantial cloning and thus are slow):

• LogicalPlan::with_new_exprs: Create a new plan with different expressions
• LogicalPlan::expressions: Return a copy of the plan’s expressions

Functions

• unwrap_arc
  Converts a Arc<LogicalPlan> without copying, if possible. Copies the plan if there is a shared reference