Github user NarineK commented on the pull request:
https://github.com/apache/spark/pull/9012#issuecomment-149370054
Hi @felixcheung and @sun-rui , I've worked on your suggestions! Thanks!
Also, I've noticed that the Cartesian product has in general a problem:
let's say my df is:
age name_a
1 NA Michael
2 30 Andy
3 19 Justin
df2 is:
name_b test
1 Michael yes
2 Andy no
3 Justin yes
4 Bob yes
when I do join(df, df2), I expect to see Cartesian product. That is - the
output has to have nrow(df)*nrow(df2) rows - see also
https://stat.ethz.ch/R-manual/R-devel/library/base/html/merge.html
but what I see is:
age name test
1 NA Michael yes
2 NA Andy no
3 NA Justin yes
4 NA Bob yes
5 30 Michael yes
6 30 Andy no
This is less than expected.
Could you please verify this ?
Thanks,
Narine
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