Bug#36764973 MTR TEST innodb.parallel_read_kill FAILING IN MYSQL 8.0.37

Description
-----------
The test has been failing 8.0.37 onwards.

Background
-----------
Test creates a table with a secondary index and inserts 150K un-commited
records in it. Earlier Innodb was ignoring the optimizer hints but using
the clustered index to count the records in the table. This behavior was
reverted through Bug#35952353 [SELECT COUNT(*) degraded performance on
8.0 compared to 5.7] in 8.0.37. Now the query execution is quicker than
before since it is using secondary index to count the records. Test
doesn't have any dependency on the secondary index, therefore, removing
the secondary index key from the table would restore the intent of the
test.

Fix
----
* Removed the secondary index key from the table.

* Prepare the table of 150K records through 8 user connections, each
  of them inserts 18750 records. This reduces test execution duration
  to qualify it as a regular test than big test.

Change-Id: I14bd90cf765ea3ad200e2d83c962f648f8366111

Author: RahulSisondia

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

@@ -12,12 +12,9 @@ END|
 CREATE TABLE t1(
 f1 INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
 f2 INT NOT NULL,
-f3 INT NOT NULL,
-KEY(f2, f3))
+f3 INT NOT NULL)
 ENGINE=INNODB;
-BEGIN;
-# Create uncommitted rows
-CALL populate_t1(1, 150000);
+# Create 150000 uncommitted rows
 SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
 SET SESSION innodb_parallel_read_threads=2;
 # Count committed rows
@@ -35,7 +32,6 @@ COUNT(*)
 Warnings:
 Warning	1287	'INFORMATION_SCHEMA.PROCESSLIST' is deprecated and will be removed in a future release. Please use performance_schema.processlist instead
 ERROR 70100: Query execution was interrupted
-COMMIT;
 # Cleanup
 SET DEBUG_SYNC="RESET";
 DROP PROCEDURE populate_t1;

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

@@ -1,5 +1,6 @@
 --source include/have_debug.inc
---source include/big_test.inc
+# Save the initial number of concurrent sessions
+--source include/count_sessions.inc
 
 --echo #
 --echo # Bug#31016076 SELECT COUNT(*) ON LARGE TABLE HANG FOREVER EVEN AFTER CTRL+C
@@ -19,13 +20,38 @@ DELIMITER ;|
 CREATE TABLE t1(
     f1 INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
     f2 INT NOT NULL,
-    f3 INT NOT NULL,
-		KEY(f2, f3))
+    f3 INT NOT NULL)
 ENGINE=INNODB;
 
-BEGIN;
---echo # Create uncommitted rows
-CALL populate_t1(1, 150000);
+let $counter = 1;
+let $max_counter=9;
+while($counter < $max_counter){
+  connect (c$counter, localhost, root,,);
+  inc $counter;
+}
+
+--disable_query_log
+--echo # Create 150000 uncommitted rows
+let $counter = 1;
+let $base=1;
+# Each of 8 connections creates 18750 records
+let $size = 18750;
+while($counter < $max_counter) {
+  connection c$counter;
+	BEGIN;
+  send_eval CALL populate_t1($base, $size);
+	connection default;
+	let $base = `SELECT $base + $size`;
+  inc $counter;
+}
+
+let $counter = 1;
+while($counter < $max_counter) {
+  connection c$counter;
+  reap;
+  inc $counter;
+}
+--enable_query_log
 
 connect (con1,localhost,root,,);
 connection con1;
@@ -59,11 +85,23 @@ connection con1;
 --error ER_QUERY_INTERRUPTED
 --reap
 
-connection default;
-COMMIT;
+
+--disable_query_log
+let $counter = 1;
+while($counter < $max_counter){
+	connection c$counter;
+	COMMIT;
+  disconnect c$counter;
+  inc $counter;
+}
+--enable_query_log
 
 --echo # Cleanup
+connection default;
 SET DEBUG_SYNC="RESET";
 DROP PROCEDURE populate_t1;
 DROP TABLE t1;
 disconnect con1;
+
+# Wait till all disconnects are completed
+--source include/wait_until_count_sessions.inc