non-equi-joins in R with data.table - backticked column name trouble

Question

I can\'t manage to do a non-equi-join with data.table when (backticked) column names include a space.

I collect such names from our database at work, and our explici

Answer 1

Specifying on= with strings is another option:

a[b, on = c("test name1==test name4", "test name2>test name3", "test name2<=V2")]

I think this works only if there is no whitespace around the equality/inequality operators and == is used instead of =.

I'm not sure if there's a way to write the on= along the lines of the OP's code, though it seems like there should be.