Function datafusion_expr::utils::ensure_any_column_reference_is_unambiguous

pub fn ensure_any_column_reference_is_unambiguous(
    expr: &Expr,
    schemas: &[&DFSchema]
) -> Result<()>

Ensure any column reference of the expression is unambiguous. Assume we have two schema: schema1: a, b ,c schema2: a, d, e

schema1.a + schema2.a is unambiguous. a + d is ambiguous, because a may come from schema1 or schema2.