I'd like to ask if we shift the tense when we report a sentence in which who is subject of the sentence.
For example :
Who came to meet you at the airport?
I saw that it is reported on Cambridge Dictionary grammar notes as
I asked them who came to meet them at the airport.
Is this correct or typo and it should have been
I asked them who had come to meet them at the airport.
And how to report the following questions ?
Who called me?
How many people came?
Which machine went wrong?
She asked me who............