Setting a data table to agent with set_tbl() replaces any table (a data
frame, a tibble, objects of class tbl_dbi or tbl_spark) associated with
the agent. If no data table is associated with an agent, setting one will
mean the data table takes precedence over table-reading function (settable in
create_agent()'s read_fn argument or with set_read_fn()).
set_tbl(agent, tbl)An agent object of class ptblank_agent that is created with
create_agent().
The input table for the agent. This can be a data frame, a
tibble, a tbl_dbi object, or a tbl_spark object. Any table already
associated with the agent will be overwritten.