[bug](bitmap) fix bitmap value not clear get wrong data

be/src/vec/aggregate_functions/aggregate_function_bitmap.h

@@ -141,7 +141,10 @@ struct AggregateFunctionBitmapData {
 
     void read(BufferReadable& buf) { DataTypeBitMap::deserialize_as_stream(value, buf); }
 
-    void reset() { is_first = true; }
+    void reset() {
+        is_first = true;
+        value.clear();
+    }
 
     BitmapValue& get() { return value; }
 };

regression-test/data/nereids_p0/sql_functions/aggregate_functions/test_aggregate_all_functions.out

@@ -11,6 +11,15 @@ xian	100.0
 beijing	100.0
 xian	100.0
 
+-- !select_all1 --
+20220201	eleme	\N	10001,72173389
+20220201	meituan	\N	10000,10001,72173389
+20220202	eleme	\N	10001,72173389
+20220203	meituan	\N	10000,10001,72173389
+
+-- !select_all2 --
+20220202	eleme	\N	10001,72173389
+
 -- !bitmap_intersect --
 20220201	10001
 20220202	10001
@@ -22,6 +31,14 @@ xian	100.0
 -- !select5 --
 3
 
+-- !select6 --
+2
+3
+
+-- !select7 --
+10000,10001,72173389
+10001,72173389
+
 -- !group_bitmap_xor --
 20220201	10000
 20220202	10001

regression-test/suites/nereids_p0/sql_functions/aggregate_functions/test_aggregate_all_functions.groovy

@@ -104,11 +104,15 @@ suite("test_aggregate_all_functions") {
     sql "insert into ${tableName_03} select dt,page,to_bitmap(user_id_int) user_id from ${tableName_04}"
     sql "insert into ${tableName_03} select dt,page,bitmap_hash(user_id_str) user_id from ${tableName_04}"
 
+    qt_select_all1 "select *, bitmap_to_string(user_id) from pv_bitmap order by 1,2;"
+    qt_select_all2 "select *, bitmap_to_string(user_id) from pv_bitmap where dt = 20220202 order by 1,2;"
+
     qt_bitmap_intersect "select dt, bitmap_to_string(bitmap_intersect(user_id_bitmap)) from ${tableName_04} group by dt order by dt"
 
     qt_select4 "select bitmap_union_count(user_id) from  ${tableName_03}"
     qt_select5 "select bitmap_count(bitmap_union(user_id)) FROM ${tableName_03}"
-
+    qt_select6 "select bitmap_union_count(user_id) from  ${tableName_03} group by page order by 1;"
+    qt_select7 "select bitmap_to_string(bitmap_union(user_id)) FROM ${tableName_03} group by page order by 1;"
     qt_group_bitmap_xor "select dt, bitmap_to_string(group_bitmap_xor(user_id_bitmap)) from ${tableName_04} group by dt order by dt"
 
     sql "DROP TABLE IF EXISTS ${tableName_03}"