LOAD 'plantuner';
SHOW	plantuner.disable_index;
 plantuner.disable_index 
-------------------------
 
(1 row)

CREATE TABLE wow (i int, j int);
CREATE INDEX i_idx ON wow (i);
CREATE INDEX j_idx ON wow (j);
SET enable_seqscan=off;
SELECT * FROM wow;
 i | j 
---+---
(0 rows)

SET plantuner.disable_index="i_idx, j_idx";
SELECT * FROM wow;
 i | j 
---+---
(0 rows)

SHOW plantuner.disable_index;
  plantuner.disable_index   
----------------------------
 public.i_idx, public.j_idx
(1 row)

SET plantuner.disable_index="i_idx, nonexistent, public.j_idx, wow";
WARNING:  'nonexistent' does not exist
WARNING:  'wow' is not an index
SHOW plantuner.disable_index;
  plantuner.disable_index   
----------------------------
 public.i_idx, public.j_idx
(1 row)

SET plantuner.enable_index="i_idx";
SHOW plantuner.enable_index;
 plantuner.enable_index 
------------------------
 public.i_idx
(1 row)

SELECT * FROM wow;
 i | j 
---+---
(0 rows)