outer_columns_helper_multi

datafusion_optimizer::optimize_projections

Function outer_columns_helper_multi 

Source 
fn outer_columns_helper_multi<'a, 'b>(
    exprs: impl IntoIterator<Item = &'a Expr>,
    columns: &'b mut HashSet<&'a Column>,
)
Expand description

A recursive subroutine that accumulates outer-referenced columns by the given expressions (exprs).

ยงParameters

  • exprs - The expressions to analyze for outer-referenced columns.
  • columns - A mutable reference to a HashSet<Column> where detected columns are collected.