A = load 'a.txt' as (id, a1);
B = load 'b.txt as (id, b1);
C = join A by id, B by id;
D = foreach C generate id,a1,b1;
dump D;

4th line fails on: Invalid field projection. Projected field [id] does not exist in schema

I tried to change to A.id but then the last line fails on: ERROR 0: Scalar has more than one row in the output.

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