Use the Apply class to create a teradataml Apply class object with the characteristics you want to consider for the call to the APPLY Table Operator.
In this example, specify the following:
- The apply_command argument to call the R interpreter in your user environment and execute your script.
- The returns argument with the list of output variables and types returned by your script.
- The env_name argument to specify your user environment handler.
- Call to the Apply class.
apply_obj = Apply( apply_command='Rscript tokenizers.R', returns={"OUTPUT": VARCHAR(200)}, env_name=demo_env, style='csv', delimiter=(';'), quotechar=('#') )You can request to view SQL queries submitted by teradataml in the background with the following statement:display.print_sqlmr_query = True
If some of the output is hidden or not visible, you can use the following statement to display 100 rows. You can display up to 999999 rows.display.max_rows = 100
- Run the R script inside the user environment with the execute_script method of the Apply class object.
apply_obj.execute_script().head(n=5)
Observe that after running the R statement, the system prints for you the corresponding SQL query as requested before producing the results.SELECT DISTINCT * FROM apply ( RETURNS (OUTPUT VARCHAR(200)) using environment('tokenizers_r_env') apply_command('Rscript tokenizers.R') style('csv') delimiter=(';'), quotechar=('#') ) as dt order by 1;Output:[1] "now i" "ow is" "w is " " is t" "is th" "s the" " the " "the h" "he ho [1] "now" "now " "now i" "ow " "ow i" "ow is" "w i" "w is" "w is [1] "now" "owi" "wis" "ist" "sth" "the" "heh" "eho" "hou" "our" "uro" "rof [1] "nowis" "owist" "wisth" "isthe" "stheh" "theho" "hehou" "ehour" "houro [10] " is" " is " " is t" "is " "is t" "is th" "s t" "s th" "s the [10] "e hou" " hour" "hour " "our o" "ur of" "r of " " of o" "of ou" "f our [10] "ourof" "urofo" "rofou" "ofour" "fourd" "ourdi" "urdis" "rdisc" "disco [13] "ofo" "fou" "our" "urd" "rdi" "dis" "isc" "sco" "con" "ont" "nte" "ten [19] " our " "our d" "ur di" "r dis" " disc" "disco" "iscon" "scont" "conte [19] " th" " the" " the " "the" "the " "the h" "he " "he h" "he ho [19] "iscon" "scont" "conte" "onten" "ntent" [25] "ent" [28] "e h" "e ho" "e hou" " ho" " hou" " hour" "hou" "hour" "hour [28] "onten" "ntent" [37] "our" "our " "our o" "ur " "ur o" "ur of" "r o" "r of" "r of [46] " of" " of " " of o" "of " "of o" "of ou" "f o" "f ou" "f our [55] " ou" " our" " our " "our" "our " "our d" "ur " "ur d" "ur di [64] "r d" "r di" "r dis" " di" " dis" " disc" "dis" "disc" "disco [73] "isc" "isco" "iscon" "sco" "scon" "scont" "con" "cont" "conte [82] "ont" "onte" "onten" "nte" "nten" "ntent" "ten" "tent" "ent" [[1]]