MDEV-15384 buf_flush_LRU_list_batch() always reports n->flushed=0, n->evicted=0

- Work around for MDEV-13942: Drop spatial index to avoid possible hang

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

@@ -99,7 +99,7 @@ l LINESTRING NOT NULL DEFAULT ST_linefromtext('linestring(448 -689,
   9716 9648,9720 9650,9721 9648,9723 9648,9726 4648,12726 4653,12731 4655,
   12734 4660,12730 4661,12733 4664,12733 4665,12735 4670,12737 4674,12741 4674,
   12738 4675,12740 4675,12737 4675,12742 4678,12743 4681,12746 4677)'),
-INDEX(b,c), SPATIAL INDEX(l)
+INDEX(b,c), SPATIAL INDEX `sidx`(l)
 ) ENGINE=InnoDB ROW_FORMAT=REDUNDANT;
 INSERT INTO t1 () VALUES (),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),();
 SELECT LENGTH(l) FROM t1;
@@ -123,10 +123,6 @@ LENGTH(l)
 11197
 INSERT INTO t1 (a) SELECT NULL FROM t1;
 INSERT INTO t1 (a) SELECT NULL FROM t1;
-INSERT INTO t1 (a) SELECT NULL FROM t1;
-INSERT INTO t1 (a) SELECT NULL FROM t1;
-INSERT INTO t1 (a) SELECT NULL FROM t1;
-INSERT INTO t1 (a) SELECT NULL FROM t1;
 CHECK TABLE t1;
 Table	Op	Msg_type	Msg_text
 test.t1	check	status	OK
@@ -143,6 +139,14 @@ SELECT OTHER_INDEX_SIZE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESTATS
 WHERE NAME='test/t1';
 OTHER_INDEX_SIZE
 1
+ALTER TABLE t1 DROP INDEX `sidx`;
+INSERT INTO t1 () VALUES (),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),();
+INSERT INTO t1 (a) SELECT NULL FROM t1;
+INSERT INTO t1 (a) SELECT NULL FROM t1;
+INSERT INTO t1 (a) SELECT NULL FROM t1;
+INSERT INTO t1 (a) SELECT NULL FROM t1;
+INSERT INTO t1 (a) SELECT NULL FROM t1;
+INSERT INTO t1 (a) SELECT NULL FROM t1;
 SELECT NAME, SUBSYSTEM FROM INFORMATION_SCHEMA.INNODB_METRICS
 WHERE NAME="buffer_LRU_batch_evict_total_pages" AND COUNT > 0;
 NAME	SUBSYSTEM

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

@@ -103,16 +103,12 @@ CREATE TABLE t1 (
   9716 9648,9720 9650,9721 9648,9723 9648,9726 4648,12726 4653,12731 4655,
   12734 4660,12730 4661,12733 4664,12733 4665,12735 4670,12737 4674,12741 4674,
   12738 4675,12740 4675,12737 4675,12742 4678,12743 4681,12746 4677)'),
-  INDEX(b,c), SPATIAL INDEX(l)
+  INDEX(b,c), SPATIAL INDEX `sidx`(l)
 ) ENGINE=InnoDB ROW_FORMAT=REDUNDANT;
 INSERT INTO t1 () VALUES (),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),();
 SELECT LENGTH(l) FROM t1;
 INSERT INTO t1 (a) SELECT NULL FROM t1;
 INSERT INTO t1 (a) SELECT NULL FROM t1;
-INSERT INTO t1 (a) SELECT NULL FROM t1;
-INSERT INTO t1 (a) SELECT NULL FROM t1;
-INSERT INTO t1 (a) SELECT NULL FROM t1;
-INSERT INTO t1 (a) SELECT NULL FROM t1;
 CHECK TABLE t1;
 UPDATE t1 SET c=true, l=ST_linefromtext('linestring(0 0,1 1,2 2)');
 DELETE FROM t1;
@@ -124,6 +120,17 @@ ANALYZE TABLE t1;
 SELECT OTHER_INDEX_SIZE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESTATS
 WHERE NAME='test/t1';
 
+# Work around MDEV-13942, Dropping the spatial index to avoid the possible hang
+ALTER TABLE t1 DROP INDEX `sidx`;
+
+INSERT INTO t1 () VALUES (),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),();
+INSERT INTO t1 (a) SELECT NULL FROM t1;
+INSERT INTO t1 (a) SELECT NULL FROM t1;
+INSERT INTO t1 (a) SELECT NULL FROM t1;
+INSERT INTO t1 (a) SELECT NULL FROM t1;
+INSERT INTO t1 (a) SELECT NULL FROM t1;
+INSERT INTO t1 (a) SELECT NULL FROM t1;
+
 SELECT NAME, SUBSYSTEM FROM INFORMATION_SCHEMA.INNODB_METRICS
 WHERE NAME="buffer_LRU_batch_evict_total_pages" AND COUNT > 0;