The original test case was lost when
merging WL#4571.
Added the testcase.
mysql-test/include/check_key_reads.inc:
Bug#49369: No testcase for key caches on partitions
New include file for testing key caches on partitions
WL#4571
mysql-test/include/check_key_req.inc:
Bug#49369: No testcase for key caches on partitions
New include file for testing key caches on partitions
WL#4571
mysql-test/r/partition_key_cache.result:
Bug#49369: No testcase for key caches on partitions
New test case for testing key caches on partitions
WL#4571
mysql-test/t/partition_key_cache.test:
Bug#49369: No testcase for key caches on partitions
New test case for testing key caches on partitions
WL#4571
