For anyone finding this thread but no answer (like we did), one solution is
to not attempt updating the matching function via its components (like the
original poster and we attempted) but to build your own matching function
string and update just that. This worked for our case, mutating a
CustomerFeed.
PHP example, relevant parts marked green:
* $matchingString = "$operator($leftOperand,$rightOperand)"; // -->
e.g. IN(FEED_ITEM_ID,{1000001,1000002,1000003})*
* $matchingFunction = new MatchingFunction();*
* $matchingFunction->setFunctionString((new
StringValue())->setValue($matchingString));*
* ...*
* $updateMask = (new
FieldMask())->setPaths(['matching_function.function_string']);*
* $operation->setUpdateMask($updateMask);*
Good luck!
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