#
# Test LEAD() Window Function
# Author: Bharath, bharath.bokka@mariadb.com
#
-- source ../include/have_columnstore.inc

--disable_warnings
DROP DATABASE IF EXISTS mcs128_db;
--enable_warnings

CREATE DATABASE mcs128_db;
USE mcs128_db;

CREATE TABLE t1 (a CHAR(1), b INT)ENGINE=Columnstore;
INSERT INTO t1 VALUES ('', NULL),('a', 123),('a', 1),('b', 123),('c', 1861),('c', 1991),('d', 10701),('d', 1071),('a', 92);

SELECT a, b, LEAD(a) OVER(ORDER BY a) lead_value FROM t1;
SELECT a, b, LEAD(b) OVER(ORDER BY b DESC) lead_value FROM t1;
SELECT a, b, LEAD(a) OVER(ORDER BY b) lead_value FROM t1;
SELECT a, b, LEAD(b) OVER(ORDER BY a DESC) lead_value FROM t1;
SELECT a, b, LEAD(b, 0) OVER(ORDER BY a DESC) lead_value FROM t1;
SELECT a, b, LEAD(b, -1) OVER(ORDER BY a DESC) lead_value FROM t1;
SELECT a, b, LEAD(b, 2) OVER(ORDER BY a DESC) lead_value FROM t1;
SELECT a, b, LEAD(a) OVER w lead_value FROM t1 WINDOW w AS (ORDER BY a DESC);
SELECT a, b, LEAD(b) OVER w lead_value FROM t1 WINDOW w AS (ORDER BY b);
SELECT a, b, LEAD(a) OVER(PARTITION BY a ORDER BY a DESC) lead_value FROM t1;
SELECT a, b, LEAD(a) OVER(PARTITION BY a ORDER BY b DESC) lead_value FROM t1;
SELECT a, b, LEAD(a) OVER(PARTITION BY a ORDER BY b ASC) lead_value FROM t1;
SELECT a, b, LEAD(a) OVER(PARTITION BY b ORDER BY a DESC) lead_value FROM t1;
SELECT a, b, LEAD(a) OVER(PARTITION BY b ORDER BY b DESC) lead_value FROM t1;
SELECT a, b, LEAD(b) OVER(PARTITION BY a ORDER BY a DESC) lead_value FROM t1;
SELECT a, b, LEAD(b) OVER(PARTITION BY a ORDER BY b DESC) lead_value FROM t1;
SELECT a, b, LEAD(b) OVER(PARTITION BY a ORDER BY b ASC) lead_value FROM t1;
SELECT a, b, LEAD(b) OVER(PARTITION BY b ORDER BY a DESC) lead_value FROM t1;
SELECT a, b, LEAD(b) OVER(PARTITION BY b ORDER BY b DESC) lead_value FROM t1;

--error ER_NO_ORDER_LIST_IN_WINDOW_SPEC
SELECT a, b, LEAD(a) OVER(PARTITION BY b) lead_value FROM t1;
--error ER_NO_ORDER_LIST_IN_WINDOW_SPEC
SELECT a, b, LEAD(a) OVER(PARTITION BY a) lead_value FROM t1;

# Clean UP
DROP DATABASE mcs128_db;