MDEV-17765 lock_discard_page() may fail to discard locks for SPATIAL INDEX

lock_discard_page(): Traverse and discard the B-tree record locks
only if they exist. Else, discard the R-tree (spatial) index locks.

storage/innobase/lock/lock0lock.cc

@@ -3424,17 +3424,12 @@ lock_update_discard(
 
 	lock_mutex_enter();
 
-	if (!lock_rec_get_first_on_page(lock_sys->rec_hash, block)
-	    && (!lock_rec_get_first_on_page(lock_sys->prdt_hash, block))) {
-		/* No locks exist on page, nothing to do */
-
-		lock_mutex_exit();
-
-		return;
-	}
-
-	/* Inherit all the locks on the page to the record and reset all
-	the locks on the page */
+	if (lock_rec_get_first_on_page(lock_sys->rec_hash, block)) {
+		ut_ad(!lock_rec_get_first_on_page(lock_sys->prdt_hash, block));
+		ut_ad(!lock_rec_get_first_on_page(lock_sys->prdt_page_hash,
+						  block));
+		/* Inherit all the locks on the page to the record and
+		reset all the locks on the page */
 
 		if (page_is_comp(page)) {
 			rec = page + PAGE_NEW_INFIMUM;
@@ -3445,7 +3440,8 @@ lock_update_discard(
 				lock_rec_inherit_to_gap(heir_block, block,
 							heir_heap_no, heap_no);
 
-			lock_rec_reset_and_release_wait(block, heap_no);
+				lock_rec_reset_and_release_wait(
+					block, heap_no);
 
 				rec = page + rec_get_next_offs(rec, TRUE);
 			} while (heap_no != PAGE_HEAP_NO_SUPREMUM);
@@ -3458,13 +3454,24 @@ lock_update_discard(
 				lock_rec_inherit_to_gap(heir_block, block,
 							heir_heap_no, heap_no);
 
-			lock_rec_reset_and_release_wait(block, heap_no);
+				lock_rec_reset_and_release_wait(
+					block, heap_no);
 
 				rec = page + rec_get_next_offs(rec, FALSE);
 			} while (heap_no != PAGE_HEAP_NO_SUPREMUM);
 		}
 
-	lock_rec_free_all_from_discard_page(block);
+		lock_rec_free_all_from_discard_page_low(
+			block->page.id.space(), block->page.id.page_no(),
+			lock_sys->rec_hash);
+	} else {
+		lock_rec_free_all_from_discard_page_low(
+			block->page.id.space(), block->page.id.page_no(),
+			lock_sys->prdt_hash);
+		lock_rec_free_all_from_discard_page_low(
+			block->page.id.space(), block->page.id.page_no(),
+			lock_sys->prdt_page_hash);
+	}
 
 	lock_mutex_exit();
 }