[Refactor] (inverted index) Refactor Inverted index file writer (#41625) #43528
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…he#41625) ## Proposed changes 1. After the normal segment is flushed, the `close_inverted_index` is directly called to write the final composite file. 2. During compaction, in the first step, the `segment writer `writes the `bkd index` while writing normal data. In the second step, the` index compaction` writes the `string index`. In the third step, `close_inverted_index` is uniformly called for all indexes to write the final files. 3. The rowset writer uses `InvertedIndexFileCollection` to store all inverted index file writers, ensuring their lifecycle exists throughout the entire writing or compaction process. 4. When the rowset writer generates the final rowset through `build(rowset)`, it can retrieve the index file sizes from the `InvertedIndexFileCollection` and record them in the rowset meta.
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be/test/olap/rowset/segment_v2/inverted_index/compaction/index_compaction_test.cpp
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pick from mater #41625