[fix](join) core caused by null-safe-equal join (#32623)

be/src/vec/exec/join/vhash_join_node.cpp

@@ -1290,7 +1290,7 @@ void HashJoinNode::_hash_table_init(RuntimeState* state) {
                     }
 
                     auto is_null = data_type->is_nullable();
-                    has_null |= is_null;
+                    has_null |= is_null || _should_convert_build_side_to_nullable[i];
                     _build_key_sz[i] =
                             data_type->get_maximum_size_of_value_in_memory() - (is_null ? 1 : 0);
                     _probe_key_sz[i] = _build_key_sz[i];

regression-test/data/query_p0/join/test_half_join_nullable_build_side.out

@@ -126,3 +126,11 @@
 2	111	111
 3	1111	1111
 
+-- !sql30 --
+1	11	11	1	11	11
+2	111	111	4	111	111
+2	111	111	2	111	111
+3	1111	1111	3	1111	1111
+4	\N	\N	\N	\N	\N
+5	1111	1111	3	1111	1111
+

regression-test/suites/query_p0/join/test_half_join_nullable_build_side.groovy

@@ -277,4 +277,13 @@ suite("test_half_join_nullable_build_side", "query,p0") {
             test_half_join_nullable_build_side_l2 l right semi join test_half_join_nullable_build_side_r2 r on  l.v2 = r.v2
         order by 1, 2, 3;
     """
+
+    qt_sql30 """
+        select
+            *
+        from
+            test_half_join_nullable_build_side_l2 l
+            left join test_half_join_nullable_build_side_l r on  l.v2 <=> r.v2
+        order by 1, 2, 3, 4 desc;
+    """
 }