MDEV-22551 Server crashes in skip_trailing_space upon ANALYZE on table with...

MDEV-22551 Server crashes in skip_trailing_space upon ANALYZE on table with long unique, or Assertion `marked_for_read()' fails

If Blob(or parent) field read_set is not set then Do not calc hash in
that case.

mysql-test/main/long_unique_bugs.result

@@ -277,3 +277,17 @@ create table t2(id int primary key, a blob, b varchar(20) as (LEFT(a,2)));
 INSERT INTO t2 VALUES (1, 'foo', default);
 DROP TABLE t1, t2;
 SET binlog_row_image= FULL;
+CREATE TABLE t1 (id INT, f TEXT UNIQUE, d DATE, PRIMARY KEY (id)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES
+(1,NULL,'2001-11-16'),
+(2,NULL,'2007-07-01'),
+(3,NULL,'2020-02-03'),
+(4,NULL,'1971-05-24'),
+(5,NULL,'1971-05-24'),
+(6,NULL,'1985-02-07');
+ANALYZE TABLE t1 PERSISTENT FOR ALL;
+Table	Op	Msg_type	Msg_text
+test.t1	analyze	status	Engine-independent statistics collected
+test.t1	analyze	Warning	Engine-independent statistics are not collected for column 'f'
+test.t1	analyze	status	OK
+DROP TABLE t1;

mysql-test/main/long_unique_bugs.test

@@ -356,3 +356,20 @@ INSERT INTO t2 VALUES (1, 'foo', default);
 # Cleanup
 DROP TABLE t1, t2;
 SET binlog_row_image= FULL;
+
+#
+# MDEV-22551 Server crashes in skip_trailing_space upon ANALYZE on table with long unique, or Assertion `marked_for_read()' fails
+#
+CREATE TABLE t1 (id INT, f TEXT UNIQUE, d DATE, PRIMARY KEY (id)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES
+               (1,NULL,'2001-11-16'),
+               (2,NULL,'2007-07-01'),
+               (3,NULL,'2020-02-03'),
+               (4,NULL,'1971-05-24'),
+               (5,NULL,'1971-05-24'),
+               (6,NULL,'1985-02-07');
+
+ANALYZE TABLE t1 PERSISTENT FOR ALL;
+
+# Cleanup
+DROP TABLE t1;

sql/item_func.cc

@@ -1734,6 +1734,22 @@ static void calc_hash_for_unique(ulong &nr1, ulong &nr2, String *str)
   cs->coll->hash_sort(cs, (uchar *)str->ptr(), str->length(), &nr1, &nr2);
 }
 
+bool Item_func_hash::is_field_read_bitmap_set(Item *item)
+{
+  Field *t_field;
+
+  if (item->type() == Item::FIELD_ITEM)
+    t_field= static_cast<Item_field *>(item)->field;
+  else
+  {
+    Item_func_left *fnc= static_cast<Item_func_left *>(item);
+    t_field= static_cast<Item_field *>(fnc->arguments()[0])->field;
+  }
+  if (bitmap_is_set(t_field->table->read_set, t_field->field_index))
+    return true;
+  return false;
+}
+
 longlong  Item_func_hash::val_int()
 {
   DBUG_EXECUTE_IF("same_long_unique_hash", return 9;);
@@ -1742,16 +1758,18 @@ longlong  Item_func_hash::val_int()
   String * str;
   for(uint i= 0;i<arg_count;i++)
   {
+    if(!is_field_read_bitmap_set(args[i]))
+      goto null_value;
     str = args[i]->val_str();
     if(args[i]->null_value)
-    {
-      null_value= 1;
-      return 0;
-    }
+      goto null_value;
     calc_hash_for_unique(nr1, nr2, str);
   }
   null_value= 0;
   return   (longlong)nr1;
+null_value:
+  null_value= 1;
+  return 0;
 }
 
 

sql/item_func.h

@@ -1035,6 +1035,7 @@ class Item_func_hash: public Item_int_func
   {}
   longlong val_int();
   bool fix_length_and_dec();
+  bool is_field_read_bitmap_set(Item *item);
   const Type_handler *type_handler() const { return &type_handler_long; }
   Item *get_copy(THD *thd)
   { return get_item_copy<Item_func_hash>(thd, this); }