fix bug in sample_random when probability_to_keep is 0 #989
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This PR makes the following changes:
sample_random
processor whenprobability_to_keep
is set to 0%. If the random number generator returns 0 then a record would be returned ( 0 <= 0 is true ). Setting therandom()
function's minimum value to 1 ensures that no records will ever be returned ( 1 <= 0 is false).probability_to_keep
set to 0%ref: #988