Dongyang Li comments

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                                            Dongyang Li

Remove expr nullable

# FE Regression Coverage Report Increment line coverage ` 87.50% (63/72)` :tada: [Increment coverage report](http://coverage.selectdb-in.cc/coverage/57862_a885fdc010a7ec12fb1ffdbf4de5ce6ea7dbf23c_merge_fe/increment_report/index.html) [Complete coverage report](http://coverage.selectdb-in.cc/coverage/57862_a885fdc010a7ec12fb1ffdbf4de5ce6ea7dbf23c_merge_fe/report/index.html)

fix get_json_string does not support array

Thank you for your contribution to Apache Doris. Don't know what should be done next? See [How to process your PR](https://cwiki.apache.org/confluence/display/DORIS/How+to+process+your+PR). Please clearly describe your PR: 1. What problem was...

fix get_json_string does not support array

# BE UT Coverage Report Increment line coverage `68.57% (24/35)` :tada: [Increment coverage report](http://coverage.selectdb-in.cc/coverage/172870eb8d9da67b79e1aeab16a26f431ad7ffec_172870eb8d9da67b79e1aeab16a26f431ad7ffec/increment_report/index.html) [Complete coverage report](http://coverage.selectdb-in.cc/coverage/172870eb8d9da67b79e1aeab16a26f431ad7ffec_172870eb8d9da67b79e1aeab16a26f431ad7ffec/report/index.html) | Category | Coverage | |-------------------|--------------------| | Function Coverage | 39.14% (10399/26568) |...

[chore](code)Remove the unused member variable _getting_const_col and get_const_col no longer constructs a block.

# BE UT Coverage Report Increment line coverage `26.32% (5/19)` :tada: [Increment coverage report](http://coverage.selectdb-in.cc/coverage/635534e3dca01d52d585a7ffdf28a0b2470e731d_635534e3dca01d52d585a7ffdf28a0b2470e731d/increment_report/index.html) [Complete coverage report](http://coverage.selectdb-in.cc/coverage/635534e3dca01d52d585a7ffdf28a0b2470e731d_635534e3dca01d52d585a7ffdf28a0b2470e731d/report/index.html) | Category | Coverage | |-------------------|--------------------| | Function Coverage | 53.36% (18709/35065) |...

[chore](code)Remove the unused member variable _getting_const_col and get_const_col no longer constructs a block.

# BE Regression && UT Coverage Report Increment line coverage `100.00% (19/19)` :tada: [Increment coverage report](http://coverage.selectdb-in.cc/coverage/58841_635534e3dca01d52d585a7ffdf28a0b2470e731d_merge/increment_report/index.html) [Complete coverage report](http://coverage.selectdb-in.cc/coverage/58841_635534e3dca01d52d585a7ffdf28a0b2470e731d_merge/report/index.html) | Category | Coverage | |-------------------|--------------------| | Function Coverage | 73.18%...

[chore](code)Remove the unused member variable _getting_const_col and get_const_col no longer constructs a block.

# BE Regression && UT Coverage Report Increment line coverage `94.44% (17/18)` :tada: [Increment coverage report](http://coverage.selectdb-in.cc/coverage/58841_635534e3dca01d52d585a7ffdf28a0b2470e731d_merge/increment_report/index.html) [Complete coverage report](http://coverage.selectdb-in.cc/coverage/58841_635534e3dca01d52d585a7ffdf28a0b2470e731d_merge/report/index.html) | Category | Coverage | |-------------------|--------------------| | Function Coverage | 72.78%...

[chore](code)Remove the unused member variable _getting_const_col and get_const_col no longer constructs a block.

# BE Regression && UT Coverage Report Increment line coverage `100.00% (18/18)` :tada: [Increment coverage report](http://coverage.selectdb-in.cc/coverage/58841_635534e3dca01d52d585a7ffdf28a0b2470e731d_merge/increment_report/index.html) [Complete coverage report](http://coverage.selectdb-in.cc/coverage/58841_635534e3dca01d52d585a7ffdf28a0b2470e731d_merge/report/index.html) | Category | Coverage | |-------------------|--------------------| | Function Coverage | 72.97%...