feat(common): support NULLS {FIRST | LAST} (risingwavelabs#8485)

Signed-off-by: Richard Chien <[email protected]>

e2e_test/batch/aggregate/array_agg.slt.part

@@ -2,7 +2,7 @@ statement ok
 SET RW_IMPLICIT_FLUSH TO true;
 
 statement ok
-create table t(v1 varchar, v2 int, v3 int)
+create table t(v1 varchar, v2 int, v3 int);
 
 query T
 select array_agg(v1) from t;
@@ -18,10 +18,7 @@ select array_agg(v1) from t;
 {NULL}
 
 statement ok
-delete from t;
-
-statement ok
-insert into t values ('aaa', 1, 1), ('bbb', 0, 2), ('ccc', 0, 5), ('ddd', 1, 4)
+insert into t values ('aaa', 1, 1), ('bbb', 0, 2), ('ccc', 0, 5), ('ddd', 1, 4);
 
 query T
 select b from (select unnest(a) from (select array_agg(v3) as v3_arr from t) g(a)) p(b) order by b;
@@ -30,16 +27,22 @@ select b from (select unnest(a) from (select array_agg(v3) as v3_arr from t) g(a
 2
 4
 5
+NULL
+
+query T
+select array_agg(v1 order by v3 asc nulls first) from t;
+----
+{NULL,aaa,bbb,ddd,ccc}
 
 query T
-select array_agg(v1 order by v3 desc) from t
+select array_agg(v1 order by v3 desc) from t;
 ----
-{ccc,ddd,bbb,aaa}
+{NULL,ccc,ddd,bbb,aaa}
 
 query T
-select array_agg(v1 order by v2 asc, v3 desc) from t
+select array_agg(v1 order by v2 asc nulls last, v3 desc) from t;
 ----
-{ccc,bbb,ddd,aaa}
+{ccc,bbb,ddd,aaa,NULL}
 
 statement ok
-drop table t
+drop table t;

e2e_test/batch/basic/index.slt.part

@@ -11,23 +11,23 @@ statement ok
 create index idx2 on t1(v2);
 
 statement ok
-insert into t1 values(1, 2),(3,4),(5,6);
+insert into t1 values (1, 2), (3, 4), (5, 6);
 
 statement ok
-explain select v1,v2 from t1 where v1 = 1;
+explain select v1, v2 from t1 where v1 = 1;
 
 query II
-select v1,v2 from t1 where v1 = 1;
+select v1, v2 from t1 where v1 = 1;
 ----
 1 2
 
 query II
-select v1,v2 from t1 where v2 = 4;
+select v1, v2 from t1 where v2 = 4;
 ----
 3 4
 
 query II
-select v1,v2 from t1 where v1 = 1 or v2 = 4 order by v1, v2;
+select v1, v2 from t1 where v1 = 1 or v2 = 4 order by v1, v2;
 ----
 1 2
 3 4
@@ -36,10 +36,57 @@ statement ok
 delete from t1 where v1 = 1;
 
 query II
-select v1,v2 from t1 order by v1, v2;
+select v1, v2 from t1 order by v1, v2;
 ----
 3 4
 5 6
 
+statement ok
+insert into t1 values (NULL, 5);
+
+statement ok
+create index idx3 on t1(v1 desc);
+
+statement ok
+create index idx4 on t1(v1 nulls first);
+
+statement ok
+create index idx5 on t1(v1 desc nulls last);
+
+query II
+select v1, v2 from t1 order by v1;
+----
+3    4
+5    6
+NULL 5
+
+query II
+select v1, v2 from t1 order by v1 desc;
+----
+NULL 5
+5    6
+3    4
+
+query II
+select v1, v2 from t1 order by v1 asc nulls first;
+----
+NULL 5
+3    4
+5    6
+
+query II
+select v1, v2 from t1 order by v1 desc nulls last;
+----
+5    6
+3    4
+NULL 5
+
+query II
+select v1, v2 from t1 order by v1 desc nulls first;
+----
+NULL 5
+5    6
+3    4
+
 statement ok
 drop table t1;