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sheet/index: Fix building the index with a filter
Previously the indexer was using the file offsets from the original file when the filter was active. Instead it should use offsets in the temporary filtered file. The writer library doesn't record or expose the total number of bytes written and flushing to the stream and retrieving the offset would be expensive and invasive. So this splits filtering and indexing into two operations.
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,5 @@ | ||
Row # Country City AccentCity Region Population Latitude Longitude | ||
493034 gb ruthven Ruthven V3 57.066667 -4.033333 | ||
493035 gb rutlandshire Rutlandshire L4 52.666667 -.666667 | ||
493036 gb rutupiae Rutupiæ G5 51.283333 1.333333 | ||
(493039 filtered rows) 493035 |