Struct ExtractScalarSubQuery 

struct ExtractScalarSubQuery<'a> {
    sub_query_info: Vec<(Subquery, String)>,
    alias_gen: &'a Arc<AliasGenerator>,
}

Fields

sub_query_info: Vec<(Subquery, String)>

alias_gen: &'a Arc<AliasGenerator>

Trait Implementations

impl TreeNodeRewriter for ExtractScalarSubQuery<'_>

type Node = Expr

The node type which is rewritable.

fn f_down(&mut self, expr: Expr) -> Result<Transformed<Expr>>

Invoked while traversing down the tree before any children are rewritten. Default implementation returns the node as is and continues recursion.

fn f_up( &mut self, node: Self::Node, ) -> Result<Transformed<Self::Node>, DataFusionError>

Invoked while traversing up the tree after all children have been rewritten. Default implementation returns the node as is and continues recursion.