Merge 10.6 into 10.9

mysql-test/suite/innodb/r/gap_lock_split.result

 SET @save_frequency=@@GLOBAL.innodb_purge_rseg_truncate_frequency;
 SET GLOBAL innodb_purge_rseg_truncate_frequency=1;
-CREATE TABLE t1(id INT PRIMARY key, val VARCHAR(16000)) ENGINE=InnoDB;
+CREATE TABLE t1(id INT PRIMARY key, val VARCHAR(16000))
+ENGINE=InnoDB STATS_PERSISTENT=0;
 INSERT INTO t1 (id,val) SELECT 2*seq,'x' FROM seq_0_to_1023;
 connect con1,localhost,root,,;
 InnoDB		0 transactions not purged
 START TRANSACTION WITH CONSISTENT SNAPSHOT;
 connection default;
 DELETE FROM t1 WHERE id=1788;
+SET @saved_dbug = @@GLOBAL.debug_dbug;
+SET @@GLOBAL.debug_dbug="d,enable_row_purge_del_mark_exit_sync_point";
 BEGIN;
 SELECT * FROM t1 WHERE id=1788 FOR UPDATE;
 id	val
 connection con1;
 COMMIT;
-InnoDB		0 transactions not purged
+SET DEBUG_SYNC = 'now WAIT_FOR row_purge_del_mark_finished';
+SET @@GLOBAL.debug_dbug = @saved_dbug;
 connection default;
 INSERT INTO t1 (id,val) VALUES (1787, REPEAT('x',2000));
 connection con1;

mysql-test/suite/innodb/t/gap_lock_split.test

 --source include/have_innodb.inc
 --source include/have_sequence.inc
 --source include/have_debug.inc
+--source include/have_debug_sync.inc
 
 SET @save_frequency=@@GLOBAL.innodb_purge_rseg_truncate_frequency;
 SET GLOBAL innodb_purge_rseg_truncate_frequency=1;
 
-CREATE TABLE t1(id INT PRIMARY key, val VARCHAR(16000)) ENGINE=InnoDB;
+CREATE TABLE t1(id INT PRIMARY key, val VARCHAR(16000))
+  ENGINE=InnoDB STATS_PERSISTENT=0;
 INSERT INTO t1 (id,val) SELECT 2*seq,'x' FROM seq_0_to_1023;
 
 connect(con1,localhost,root,,);
@@ -16,13 +18,18 @@ connection default;
 
 DELETE FROM t1 WHERE id=1788;
 
+SET @saved_dbug = @@GLOBAL.debug_dbug;
+SET @@GLOBAL.debug_dbug="d,enable_row_purge_del_mark_exit_sync_point";
+
 BEGIN;
 # This will return no result, but should acquire a gap lock.
 SELECT * FROM t1 WHERE id=1788 FOR UPDATE;
 
 connection con1;
 COMMIT;
-source include/wait_all_purged.inc;
+SET DEBUG_SYNC = 'now WAIT_FOR row_purge_del_mark_finished';
+SET @@GLOBAL.debug_dbug = @saved_dbug;
+
 connection default;
 
 INSERT INTO t1 (id,val) VALUES (1787, REPEAT('x',2000));

storage/innobase/btr/btr0cur.cc

@@ -4991,8 +4991,6 @@ class btr_est_cur_t
   page_id_t m_page_id;
   /** Current block */
   buf_block_t *m_block;
-  /** mtr savepoint of the current block */
-  ulint m_savepoint;
   /** Page search mode, can differ from m_mode for non-leaf pages, see c-tor
   comments for details */
   page_cur_mode_t m_page_mode;
@@ -5051,7 +5049,6 @@ class btr_est_cur_t
   bool fetch_child(ulint level, mtr_t &mtr, const buf_block_t *right_parent)
   {
     buf_block_t *parent_block= m_block;
-    ulint parent_savepoint= m_savepoint;
 
     m_block= btr_block_get(*index(), m_page_id.page_no(), RW_S_LATCH, !level,
                            &mtr, nullptr);
@@ -5059,9 +5056,10 @@ class btr_est_cur_t
       return false;
 
     if (parent_block && parent_block != right_parent)
-      mtr.rollback_to_savepoint(parent_savepoint, parent_savepoint + 1);
-
-    m_savepoint= mtr.get_savepoint() - 1;
+    {
+      ut_ad(mtr.get_savepoint() >= 2);
+      mtr.rollback_to_savepoint(1, 2);
+    }
 
     return level == ULINT_UNDEFINED ||
       btr_page_get_level(m_block->page.frame) == level;
@@ -5123,10 +5121,10 @@ class btr_est_cur_t
     return true;
   }
 
-  /** Gets page id of the current record child.
+  /** Read page id of the current record child.
   @param offsets offsets array.
   @param heap heap for offsets array */
-  void get_child(rec_offs **offsets, mem_heap_t **heap)
+  void read_child_page_id(rec_offs **offsets, mem_heap_t **heap)
   {
     const rec_t *node_ptr= page_cur_get_rec(&m_page_cur);
 
@@ -5196,11 +5194,7 @@ class btr_est_cur_t
   /** Copies block pointer and savepoint from another btr_est_cur_t in the case
   if both left and right border cursors point to the same block.
   @param o reference to the other btr_est_cur_t object. */
-  void set_block(const btr_est_cur_t &o)
-  {
-    m_block= o.m_block;
-    m_savepoint= o.m_savepoint;
-  }
+  void set_block(const btr_est_cur_t &o) { m_block= o.m_block; }
 
   /** @return current record number. */
   ulint nth_rec() const { return m_nth_rec; }
@@ -5239,7 +5233,6 @@ static ha_rows btr_estimate_n_rows_in_range_on_level(
   pages before reaching right_page_no, then we estimate the average from the
   pages scanned so far. */
   static constexpr uint n_pages_read_limit= 9;
-  ulint savepoint= 0;
   buf_block_t *block= nullptr;
   const dict_index_t *index= left_cur.index();
 
@@ -5269,9 +5262,6 @@ static ha_rows btr_estimate_n_rows_in_range_on_level(
   {
     page_t *page;
     buf_block_t *prev_block= block;
-    ulint prev_savepoint= savepoint;
-
-    savepoint= mtr.get_savepoint();
 
     /* Fetch the page. */
     block= btr_block_get(*index, page_id.page_no(), RW_S_LATCH, !level, &mtr,
@@ -5279,9 +5269,11 @@ static ha_rows btr_estimate_n_rows_in_range_on_level(
 
     if (prev_block)
     {
-      mtr.rollback_to_savepoint(prev_savepoint, prev_savepoint + 1);
-      if (block)
-        savepoint--;
+      ulint savepoint = mtr.get_savepoint();
+      /* Index s-lock, p1, p2 latches, can also be p1 and p2 parent latch if
+      they are not diverged */
+      ut_ad(savepoint >= 3);
+      mtr.rollback_to_savepoint(savepoint - 2, savepoint - 1);
     }
 
     if (!block || btr_page_get_level(buf_block_get_frame(block)) != level)
@@ -5312,8 +5304,8 @@ static ha_rows btr_estimate_n_rows_in_range_on_level(
 
   if (block)
   {
-    ut_ad(block == mtr.at_savepoint(savepoint));
-    mtr.rollback_to_savepoint(savepoint, savepoint + 1);
+    ut_ad(block == mtr.at_savepoint(mtr.get_savepoint() - 1));
+    mtr.rollback_to_savepoint(mtr.get_savepoint() - 1);
   }
 
   return (n_rows);
@@ -5322,8 +5314,8 @@ static ha_rows btr_estimate_n_rows_in_range_on_level(
 
   if (block)
   {
-    ut_ad(block == mtr.at_savepoint(savepoint));
-    mtr.rollback_to_savepoint(savepoint, savepoint + 1);
+    ut_ad(block == mtr.at_savepoint(mtr.get_savepoint() - 1));
+    mtr.rollback_to_savepoint(mtr.get_savepoint() - 1);
   }
 
   is_n_rows_exact= false;
@@ -5517,8 +5509,12 @@ ha_rows btr_estimate_n_rows_in_range(dict_index_t *index,
   {
     ut_ad(height > 0);
     height--;
-    p1.get_child(&offsets, &heap);
-    p2.get_child(&offsets, &heap);
+    ut_ad(mtr.memo_contains(p1.index()->lock, MTR_MEMO_S_LOCK));
+    ut_ad(mtr.memo_contains_flagged(p1.block(), MTR_MEMO_PAGE_S_FIX));
+    p1.read_child_page_id(&offsets, &heap);
+    ut_ad(mtr.memo_contains(p2.index()->lock, MTR_MEMO_S_LOCK));
+    ut_ad(mtr.memo_contains_flagged(p2.block(), MTR_MEMO_PAGE_S_FIX));
+    p2.read_child_page_id(&offsets, &heap);
     goto search_loop;
   }