Is it correct to consider dissolving HCl gas in water as oxidation –reduction process? References define oxidation –reduction process as change in oxidation number ,Accordingly it is not appropriate to describe the mentioned  process as oxidation –reduction because there is  no change in oxidation number of atoms and it is not a chemical reaction .

But the teacher consider it as oxidation –reduction reaction because HCl gas ionize in water .
Iam confused , so any idea will greatly help.
Given the dissolution of $\ce{HCl}$ gas in water:  

$$\ce{HCl(g) + H2O(l) &lt;--&gt;H3O+(aq) +Cl-(aq)}$$  

The oxidation state of all hydrogen atoms is +1 and that of all chlorine atoms is -1. Thus, nothing has been oxidized or reduced, and no redox reaction has taken place.