presto-parser/src/main/java/io/prestosql/sql/tree/DropSchema.java/DropSchema/equals
class DropSchema:    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) {
            return true;
        }
        if ((obj == null) || (getClass() != obj.getClass())) {
            return false;
        }
        DropSchema o = (DropSchema) obj;
        return Objects.equals(schemaName, o.schemaName) &&
                (exists == o.exists) &&
                (cascade == o.cascade);
    }