presto-main/src/main/java/io/prestosql/sql/planner/optimizations/PredicatePushDown.java/Rewriter/areExpressionsEquivalent
class Rewriter:        private boolean areExpressionsEquivalent(Expression leftExpression, Expression rightExpression)
        {
            return expressionEquivalence.areExpressionsEquivalent(session, leftExpression, rightExpression, types);
        }