Fixed bug where CHECK TABLE for a MYISAM table before 5.5.38 wrongly gave warning:
"Table upgrade required..." The row format is only different for the case where we have a very old MyISAM table with varchar fields, null fields and created with CHECKSUM=1 The table is usable, except that CHECKSUM TABLE will give a wrong result and CHECK TABLE will warn about this. I added a test for this to warn when a table needs to be upgraded, but forgot to add a test that this was only relevant for tables with CHECKSUM=1 This is now fixed. storage/myisam/ha_myisam.cc: Fixed wrong test.
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