Taking a slice of a queryset with extras specified alters the query

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If you do a qs as the following:

foo = MyObjects.objects.all().extra(select={'relevance': match_expr},

where=[match_expr],
params=[query])

print foo

bar = MyObjects.objects.all().extra(select={'relevance': match_expr},

where=[match_expr],
params=[query])

print bar[:10]

The first 10 elements of foo may not match bar, bar will simply be the first 10 objects and it discards the extra where clause.