COMPUTE_STATS_MIN_SAMPLE_SIZE Query Option
COMPUTE_STATS_MIN_SAMPLE_SIZE query option specifies
the minimum number of bytes that will be scanned in
TABLESAMPLE, regardless of the user-supplied sampling percent.
This query option prevents sampling for very small tables where accurate
stats can be obtained cheaply without sampling because the minimum sample
size is required to get meaningful stats.
Added in: Impala 2.12