innerjoin of table of tables

In MATLAB 2017b I cannot do an innerjoin of two tables where one or both has a table for the datatype associated with one of the variables. This was fixed in ML 2018 along with some better display support for tables of tables ... but stepping up a version of ML is not an easy option for me. Does anyone have a workaround to get innerjoin to work in 2017b?

Here is some code that runs in 2018a but not 2017b

a = cellfun(@(x)table(x,'variablenames',{'b'}),num2cell(1:10),...
   'uniformoutput',false);
b = table((1:10)',cat(1,a{:}),'variablenames',{'b','a'});
d.c = (101:2:110)';
d.b = (1:2:10)';
e=struct2table(d);

f=innerjoin(b,e,'keys','b')

Answer 1

[Samatha Aleti]

You may do this by converting table of tables into table of arrays using “table2array” as follows:

a = cellfun(@(x)table(x,'variablenames',{'b'}),num2cell(1:10),... 
   'uniformoutput',false); 
conv = zeros(1,10); 
for i = 1:10 
    conv(i) = table2array(a{i}); 
end 
b = table((1:10)',cat(1,conv'),'variablenames',{'b','a'}); 
d.c = (101:2:110)'; 
d.b = (1:2:10)'; 
e=struct2table(d); 
f=innerjoin(b,e,'keys','b');