[fix](csv_reader)Fixed bug when parsing multi-character delimiters.

[hubgeter]

Proposed changes

Fixed bug when parsing multi-character delimiters.

example:
column_separator : "xx"
data.csv : data1xxxxdata2

Parse incorrectly:
data1[xx]xxdata2
data1x[xx]xdata2
data1xx[xx]data2
The string "xxxx" is parsed into three "xx" delimiters.

Parse correctly:
data1[xx]xxdata2
data1xx[xx]data2

Further comments

If this is a relatively large or complex change, kick off the discussion at [email protected] by explaining why you chose the solution you did and what alternatives you considered, etc...

[hubgeter]

run buildall

[github-actions]

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

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 36.82% (7979/21669)
Line Coverage: 28.85% (64026/221934)
Region Coverage: 27.73% (33220/119783)
Branch Coverage: 24.36% (17031/69912)
Coverage Report: http://coverage.selectdb-in.cc/coverage/108bfb364d4b1798b8c9efdc9286c5feff563f12_108bfb364d4b1798b8c9efdc9286c5feff563f12/report/index.html

[doris-robot]

(From new machine)TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 51.17 seconds
stream load tsv: 600 seconds loaded 74807831229 Bytes, about 118 MB/s
stream load json: 21 seconds loaded 2358488459 Bytes, about 107 MB/s
stream load orc: 64 seconds loaded 1101869774 Bytes, about 16 MB/s
stream load parquet: 32 seconds loaded 861443392 Bytes, about 25 MB/s
insert into select: 29.1 seconds inserted 10000000 Rows, about 343K ops/s
storage size: 17162267551 Bytes

[hubgeter]

run buildall

[github-actions]

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

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 36.83% (7979/21667)
Line Coverage: 28.85% (64028/221937)
Region Coverage: 27.73% (33219/119781)
Branch Coverage: 24.36% (17029/69912)
Coverage Report: http://coverage.selectdb-in.cc/coverage/5e47b96e503514421952b08b218dd7bd19512f73_5e47b96e503514421952b08b218dd7bd19512f73/report/index.html

[doris-robot]

(From new machine)TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 47.52 seconds
stream load tsv: 596 seconds loaded 74807831229 Bytes, about 119 MB/s
stream load json: 21 seconds loaded 2358488459 Bytes, about 107 MB/s
stream load orc: 64 seconds loaded 1101869774 Bytes, about 16 MB/s
stream load parquet: 31 seconds loaded 861443392 Bytes, about 26 MB/s
insert into select: 29.1 seconds inserted 10000000 Rows, about 343K ops/s
storage size: 17162306529 Bytes

[TangSiyang2001]

LGTM

[github-actions]

PR approved by anyone and no changes requested.

[github-actions]

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

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 36.75% (7979/21713)
Line Coverage: 28.82% (64034/222200)
Region Coverage: 27.71% (33237/119933)
Branch Coverage: 24.35% (17039/69988)
Coverage Report: http://coverage.selectdb-in.cc/coverage/5e47b96e503514421952b08b218dd7bd19512f73_5e47b96e503514421952b08b218dd7bd19512f73/report/index.html

[morningman]

run buildall

[morningman]

LGTM

[github-actions]

PR approved by at least one committer and no changes requested.

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 36.76% (7981/21713)
Line Coverage: 28.83% (64058/222200)
Region Coverage: 27.72% (33251/119933)
Branch Coverage: 24.35% (17044/69988)
Coverage Report: http://coverage.selectdb-in.cc/coverage/adfae23a8df06fa7e67b0ccad308dd9382a2952f_adfae23a8df06fa7e67b0ccad308dd9382a2952f/report/index.html

[hubgeter]

run buildall

[github-actions]

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

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 36.69% (7981/21755)
Line Coverage: 28.74% (64052/222902)
Region Coverage: 27.64% (33249/120284)
Branch Coverage: 24.28% (17039/70168)
Coverage Report: http://coverage.selectdb-in.cc/coverage/942928cdb67ebded758d8e11a47a673cdc2538dd_942928cdb67ebded758d8e11a47a673cdc2538dd/report/index.html

[doris-robot]

(From new machine)TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 47.2 seconds
stream load tsv: 601 seconds loaded 74807831229 Bytes, about 118 MB/s
stream load json: 20 seconds loaded 2358488459 Bytes, about 112 MB/s
stream load orc: 64 seconds loaded 1101869774 Bytes, about 16 MB/s
stream load parquet: 32 seconds loaded 861443392 Bytes, about 25 MB/s
insert into select: 29.1 seconds inserted 10000000 Rows, about 343K ops/s
storage size: 17162463195 Bytes