Can anyone tell why its showing only 101 item even though the ids passed are 1000
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If "batchNumber" is being used for the "batchSize" paging value in a query, and the (filtered) query returns only 101 items, then the results would only be 101 items regardless of whether the batchSize is larger. Since we can't see the code you're using to query, or the data size, or the filters you're applying, it's hard to guess what might really be happening or why, as Stefan already mentioned.
from the query 1000 ids are generated ,I tested them , in PM also from variable tab 1000 ids are being shown but in the history tab its showing 101 items