presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/ExpressionRewriteRuleSet.java/ExpressionRewriteRuleSet/ExpressionRewriteRuleSet
class ExpressionRewriteRuleSet:    public ExpressionRewriteRuleSet(ExpressionRewriter rewriter)
    {
        this.rewriter = requireNonNull(rewriter, "rewriter is null");
    }