Hello
I'm pretty new to protobuf and kinda stuck with this problem and want some
ideas from people who use this extensively.
I have two message
Message A {
string foo = 1;
string bar = 2;
}
Message B {
string hello = 1;
string world = 2;
}
Now I have 2 sources a SQL and another Hive. And the SQL source actually
returns A. So for SQL it is READ<A> and B which is a meta data we get this
from SQL queries. So we never needed B all this while as A did the job for
us.
Now our pipelines will start reading from the Hive as well. But for hive,
we have these Metadata as columns of record .. So now I have (A + B)
combined.
Since the code was initially written for SQL the READ<A> Facade can't be
modified as client code will change.
but inside I need to now do some merging of* A and B dynamically before
actually calling Hive.*
Is this possible in protobuf? I checked if Dynamic message can help me. I
couldn't get it to resolve my issue. Can't use mergeFrom as well as both
the message types need to be equal.
I can't do
Message C {
Message A
Message B
}
This will change the eventual results of the record having extra columns.
*I need something like mergeFrom for 2 different messages type.* I have
access to both the proto's inside the READ. So I can do anything and
everything with these two proto's. But eventually, I want a merged proto C
from A and B by code and not by .proto
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