fix: dont merge missed series if there is no overlap or has more points #5809
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Fixes #5808
dont merge missed series if there is no overlap or has more points
Cases
what happened previously
timerange :- t1 - t5
time :- t1 - t2 - t3 - t4 - t5
t1 - t2 = cache miss = actual query
t4 - t5 = cache miss = actual query
t2 - t4
cachedSeries = t1, t2, t4, t5
cache_start = t2
cache_end = t4
here data for t3 is empty.