concatenate two tables horizontally

[shashi]

One question is should this be called hcat? -- if we see a table as a vector of rows, this is inconsistent with hcat on vectors. I'd suggest something like hstack but that may conflate with the stack unstack concept.

It would be nice to explore generally selections with multiple tables. Something like: select(table1, table2, All(), All()) but there needs to be API to interleave columns from both tables, in other words to refer to columns from either table at a time.

[piever]

Should merge and this thing be considered analogous and be called hmerge and vmerge? It's certainly due to my lack of experience, but the first time I saw merge I thought it would concatenate horizontally (which would correspond to merging the NamedTuples corresponding to the rows).

[shashi]

That's a good point! I like vmerge and hmerge

vmerge is vcat in the case where the tables either don't have or have mismatching primary keys...