What is exactly a field expression? Q2

“$a” is this considered as field expression? because through the peek i had in google i tough something like this is a field expression x.y mongo ver “$x.y” ???

so a is an array. and i’m confused, i also can’t mention the issue fully since it may contain the answer, yet still, should i consider the sentence exactly as it is? or should i consider it as …

Hi,

A field expression is just an expression to access the field, so $a is a field expression to access the a field. Please feel free to send me a PM to see the issue you found.

José Carlos

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some where else you mention these are not tricky Questions… here i take the field expression it self, not the value it may or may not contains within the provided data…