--
-- Testing cursors on columnar tables.
--
CREATE TABLE test_cursor (a int, b int) USING columnar;
INSERT INTO test_cursor SELECT i, j FROM generate_series(0, 100)i, generate_series(100, 200)j;
-- A case where the WHERE clause might filter out some chunks
EXPLAIN (analyze on, costs off, timing off, summary off) SELECT * FROM test_cursor WHERE a = 25;
                             QUERY PLAN
---------------------------------------------------------------------
 Custom Scan (ColumnarScan) on test_cursor (actual rows=101 loops=1)
   Filter: (a = 25)
   Rows Removed by Filter: 9899
   Columnar Chunk Groups Removed by Filter: 1
(4 rows)

BEGIN;
DECLARE a_25 SCROLL CURSOR
FOR SELECT * FROM test_cursor WHERE a = 25 ORDER BY 2;
FETCH 3 FROM a_25;
 a  |  b
---------------------------------------------------------------------
 25 | 100
 25 | 101
 25 | 102
(3 rows)

FETCH PRIOR FROM a_25;
 a  |  b
---------------------------------------------------------------------
 25 | 101
(1 row)

FETCH NEXT FROM a_25;
 a  |  b
---------------------------------------------------------------------
 25 | 102
(1 row)

FETCH NEXT FROM a_25;
 a  |  b
---------------------------------------------------------------------
 25 | 103
(1 row)

FETCH RELATIVE -2 FROM a_25;
 a  |  b
---------------------------------------------------------------------
 25 | 101
(1 row)

FETCH LAST FROM a_25;
 a  |  b
---------------------------------------------------------------------
 25 | 200
(1 row)

FETCH RELATIVE -25 FROM a_25;
 a  |  b
---------------------------------------------------------------------
 25 | 175
(1 row)

MOVE a_25;
FETCH a_25;
 a  |  b
---------------------------------------------------------------------
 25 | 177
(1 row)

MOVE LAST FROM a_25;
FETCH a_25;
 a | b
---------------------------------------------------------------------
(0 rows)

MOVE RELATIVE -3 FROM a_25;
FETCH a_25;
 a  |  b
---------------------------------------------------------------------
 25 | 199
(1 row)

MOVE RELATIVE -3 FROM a_25;
FETCH a_25;
 a  |  b
---------------------------------------------------------------------
 25 | 197
(1 row)

MOVE FORWARD 2 FROM a_25;
FETCH a_25;
 a  |  b
---------------------------------------------------------------------
 25 | 200
(1 row)

MOVE RELATIVE -3 FROM a_25;
FETCH a_25;
 a  |  b
---------------------------------------------------------------------
 25 | 198
(1 row)

UPDATE test_cursor SET a = 8000 WHERE CURRENT OF a_25;
ERROR:  UPDATE and CTID scans not supported for ColumnarScan
COMMIT;
-- A case where the WHERE clause doesn't filter out any chunks
EXPLAIN (analyze on, costs off, timing off, summary off) SELECT * FROM test_cursor WHERE a > 25;
                              QUERY PLAN
---------------------------------------------------------------------
 Custom Scan (ColumnarScan) on test_cursor (actual rows=7575 loops=1)
   Filter: (a > 25)
   Rows Removed by Filter: 2626
   Columnar Chunk Groups Removed by Filter: 0
(4 rows)

BEGIN;
DECLARE a_25 SCROLL CURSOR
FOR SELECT * FROM test_cursor WHERE a > 25 ORDER BY 1, 2;
FETCH 3 FROM a_25;
 a  |  b
---------------------------------------------------------------------
 26 | 100
 26 | 101
 26 | 102
(3 rows)

FETCH PRIOR FROM a_25;
 a  |  b
---------------------------------------------------------------------
 26 | 101
(1 row)

FETCH NEXT FROM a_25;
 a  |  b
---------------------------------------------------------------------
 26 | 102
(1 row)

FETCH NEXT FROM a_25;
 a  |  b
---------------------------------------------------------------------
 26 | 103
(1 row)

FETCH RELATIVE -2 FROM a_25;
 a  |  b
---------------------------------------------------------------------
 26 | 101
(1 row)

FETCH LAST FROM a_25;
  a  |  b
---------------------------------------------------------------------
 100 | 200
(1 row)

FETCH RELATIVE -25 FROM a_25;
  a  |  b
---------------------------------------------------------------------
 100 | 175
(1 row)

MOVE a_25;
FETCH a_25;
  a  |  b
---------------------------------------------------------------------
 100 | 177
(1 row)

MOVE LAST FROM a_25;
FETCH a_25;
 a | b
---------------------------------------------------------------------
(0 rows)

MOVE RELATIVE -3 FROM a_25;
FETCH a_25;
  a  |  b
---------------------------------------------------------------------
 100 | 199
(1 row)

MOVE RELATIVE -3 FROM a_25;
FETCH a_25;
  a  |  b
---------------------------------------------------------------------
 100 | 197
(1 row)

MOVE FORWARD 2 FROM a_25;
FETCH a_25;
  a  |  b
---------------------------------------------------------------------
 100 | 200
(1 row)

MOVE RELATIVE -3 FROM a_25;
FETCH a_25;
  a  |  b
---------------------------------------------------------------------
 100 | 198
(1 row)

UPDATE test_cursor SET a = 8000 WHERE CURRENT OF a_25;
ERROR:  UPDATE and CTID scans not supported for ColumnarScan
COMMIT;
DROP TABLE test_cursor CASCADE;