Attach table info to Column inputs of UDTFs

[pearu]

Something like the following should work

@omnisci('int32(Column<double>, Column<double>, RowMultiplier, OutputColumn<double>)')
def foo(x, y, m, z):
    if x.table_id == y.table_id:
        # do something
    else:
        # do something different
    <return z size> 

Risks:

• the above makes sense for queries like

  select * from table(foo(mytable.x, mytable.y, 1))
  

  but does it for queries like

  select * from table(foo(cursor(select x, y from mytable), 1))
  select * from table(foo(cursor(select x from mytable), cursor(select x from mytable2), 1))
  

  where the table info may get lost due to usage of cursor or when the input column is an output of another UDTF?