[opt](invert index) Empty strings are not written to the index in the…

[zzzxl1993]

… case of TOKENIZED (#28822)

Proposed changes

#28822

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[zzzxl1993]

run buildall

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[zzzxl1993]

run buildall

[zzzxl1993]

run buildall

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 37.75% (7993/21175)
Line Coverage: 29.45% (64939/220524)
Region Coverage: 28.91% (33406/115532)
Branch Coverage: 24.78% (17137/69150)
Coverage Report: http://coverage.selectdb-in.cc/coverage/89cbe2a4cfed35e343666c58c7d699b15aec9c71_89cbe2a4cfed35e343666c58c7d699b15aec9c71/report/index.html

[doris-robot]

(From new machine)TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 49.32 seconds
stream load tsv: 564 seconds loaded 74807831229 Bytes, about 126 MB/s
stream load json: 20 seconds loaded 2358488459 Bytes, about 112 MB/s
stream load orc: 66 seconds loaded 1101869774 Bytes, about 15 MB/s
stream load parquet: 32 seconds loaded 861443392 Bytes, about 25 MB/s
insert into select: 29.8 seconds inserted 10000000 Rows, about 335K ops/s
storage size: 17162867615 Bytes