Hello, mid star ATC decided to vector me to the ILS runway (I guess due to a stiff angle between the STAR and the ILS) 

FINE! But I wish they gave me a heads up. I came in very high and had to go around as missed approach.

For the future how do I know what’s the ATC plan so I can descend accordingly? 
 

Here is an image from the star vs vector by atc. :

you don't need to mention the airport / arrival / approach ..... we'll make a guess !!!

9 hours ago, vadriver said:

you don't need to mention the airport / arrival / approach ..... we'll make a guess !!!

You can see from the image that is it's Dallas Fort Worth (KDFW). I have experienced this as well, so I would like to ask this too.

Cheers,

Michael

the image suggests the JOVEM arrival (KDFW North flow) to a R18L approach ?????

8 hours ago, vadriver said:

the image suggests the JOVEM arrival (KDFW North flow) to a R18L approach ?????

What does it matter if it’s 18L or 17L?

the question is regarding how can  prepare next time when ATC does this vectors again. They cleared me to follow the STAR and  all of the sudden vector me to the runway while I didn’t get a chance to lose enough altitude. 

7 hours ago, hzyoni said:

What does it matter if it’s 18L or 17L?

I don't think it was about 18L or 17L... The point is that if you choose a STAR that leads you south of the airport together while doing a southbound approach, you shouldn't be surprised to get vectors

15 hours ago, hzyoni said:

the question is regarding how can  prepare next time when ATC does this vectors again.

Firstly, one would note that the JOVEM (north flow) and parallel VKTRY (south flow) arrivals have lengthy transitions ...... with ATC assignment some 30-40 mins before touchdown ..... and both requiring vectors to the respective approach procedure.

One has the impression you & ATC were not expecting the south flow arrival as the winds earlier had "northerly" headwinds.

A guess is that in that time from STAR assignment to passing VKTRY on descent at about 15000', there was a wind change (which may have been suggested in the TAF), hence the change to a south flow. If vectors began as suggested on the image before VKTRY, a 3⁰ fpa descent should have been possible to JAYCI (?)

Next time .... well there is no clear "rule", just expect the possibles.

For me, I would say that the problem arises when the ATC ask you to descend via the arrival and then mid-arrival ask you to follow vectors. For instance, in the Airbus, you can now only select open descend or descend via ft/min. Not descend via profile, which is what the "descend via the arrival" is suppose to do.