Function datafusion_optimizer::utils::find_join_exprs

pub fn find_join_exprs(
    exprs: Vec<&Expr>,
    schema: &DFSchemaRef
) -> Result<(Vec<Expr>, Vec<Expr>)>

Looks for correlating expressions: equality expressions with one field from the subquery, and one not in the subquery (closed upon from outer scope)

Arguments

• exprs - List of expressions that may or may not be joins
• fields - HashSet of fully qualified (table.col) fields in subquery schema

Return value

Tuple of (expressions containing joins, remaining non-join expressions)