Fix flakiness in vtexplain unit test case.

Signed-off-by: Arthur Schreiber <[email protected]>

Author: arthurschreiber

go/vt/vtexplain/testdata/multi-output/selectsharded-output.txt

@@ -207,9 +207,9 @@ SELECT id FROM orders WHERE id IN (1, "1", 1)
 2 ks_sharded/40-80: select id from orders where id in (1, '1', 1) limit 10001
 
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-(SELECT user.id, user.name FROM user WHERE user.id = 1) UNION (SELECT user.id, user.name FROM user WHERE user.id = 2)
+(SELECT user.id, user.name FROM user WHERE user.id = 1) UNION (SELECT user.id, user.name FROM user WHERE user.id = 3)
 
-2 ks_sharded/-40: select distinct `user`.id, `user`.`name`, weight_string(`user`.id), weight_string(`user`.`name`) from `user` where `user`.id = 2 limit 10001
-2 ks_sharded/-40: select distinct `user`.id, `user`.`name`, weight_string(`user`.id), weight_string(`user`.`name`) from `user` where `user`.id = 1 limit 10001
+1 ks_sharded/-40: select distinct `user`.id, `user`.`name`, weight_string(`user`.id), weight_string(`user`.`name`) from `user` where `user`.id = 1 limit 10001
+1 ks_sharded/40-80: select distinct `user`.id, `user`.`name`, weight_string(`user`.id), weight_string(`user`.`name`) from `user` where `user`.id = 3 limit 10001
 
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go/vt/vtexplain/testdata/selectsharded-queries.sql

@@ -40,4 +40,4 @@ SELECT user.id, user.name, name_info.info FROM user INNER JOIN music ON (user.id
 
 SELECT id FROM orders WHERE id IN (1, "1", 1);
 
-(SELECT user.id, user.name FROM user WHERE user.id = 1) UNION (SELECT user.id, user.name FROM user WHERE user.id = 2);
+(SELECT user.id, user.name FROM user WHERE user.id = 1) UNION (SELECT user.id, user.name FROM user WHERE user.id = 3);