mz_expr::relation::canonicalize

Function replace_subexpr_and_reduce

Source 
fn replace_subexpr_and_reduce(
    predicate: &mut MirScalarExpr,
    replace_if_equal_to: &MirScalarExpr,
    replace_with: &MirScalarExpr,
    column_types: &[SqlColumnType],
) -> bool
Expand description

Replace any matching subexpressions in predicate, and if predicate has changed, reduce it. Return whether predicate has changed.