The configuration community:
myisam_stats_method
Information
How the server treats NULL values when collecting statistics about the distribution of index values for MyISAM tables. This variable has two possible values nulls_equal and nulls_unequal. For nulls_equal all NULL index values are considered equal and form a single value group that has a size equal to the number of NULL values. For nulls_unequal NULL values are considered unequal and each NULL forms a distinct value group of size 1.
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