perf: pre-alloc buffer for raw block from views

[zitsen]

No description provided.

[codecov-commenter]

Codecov Report

Merging #223 (7830693) into main (f49a0e5) will increase coverage by 0.13%.
Report is 8 commits behind head on main.
The diff coverage is 98.14%.

@@            Coverage Diff             @@
##             main     #223      +/-   ##
==========================================
+ Coverage   61.54%   61.67%   +0.13%     
==========================================
  Files         101      101              
  Lines       23152    23194      +42     
==========================================
+ Hits        14248    14306      +58     
+ Misses       8904     8888      -16     

Files Changed	Coverage Δ
taos-query/src/common/raw/views/mod.rs	28.28% <96.00%> (+2.39%)	⬆️
taos-query/src/common/raw/mod.rs	78.39% <100.00%> (+0.04%)	⬆️
taos-query/src/common/raw/views/json_view.rs	72.83% <100.00%> (+1.31%)	⬆️
taos-query/src/common/raw/views/n_char_view.rs	75.31% <100.00%> (+0.53%)	⬆️
taos-query/src/common/raw/views/nulls.rs	90.98% <100.00%> (ø)
taos-query/src/common/raw/views/var_char_view.rs	65.28% <100.00%> (+1.50%)	⬆️

... and 3 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more