add tests for inner join

tests/suites/0_stateless/20+_others/20_0001_planner_v2.result

@@ -38,3 +38,12 @@
 2
 2
 4
+1	1
+2	2
+3	3
+1	1
+2	2
+2	1
+3	2
+2	1
+3	2

tests/suites/0_stateless/20+_others/20_0001_planner_v2.sql

@@ -34,4 +34,22 @@ select sum(a) from t group by a having sum(a) > 1;
 select sum(a+1) from t group by a+1 having sum(a+1) = 2;
 select sum(a+1) from t group by a+1, b having sum(a+1) > 3;
 drop table t;
-set enable_planner_v2 = 0;
+
+-- Inner join
+create table t(a int);
+insert into t values(1),(2),(3);
+create table t1(b float);
+insert into t1 values(1.0),(2.0),(3.0);
+create table t2(c uint32 null);
+insert into t2 values(1),(2),(null);
+
+select * from t inner join t1 on cast(t.a as float) = t1.b;
+select * from t inner join t2 on t.a = t2.c;
+select * from t inner join t2 on t.a = t2.c + 1;
+select * from t inner join t2 on t.a = t2.c + 1 and t.a - 1 = t2.c;
+
+drop table t;
+drop table t1;
+drop table t2;
+
+set enable_planner_v2 = 0;