use DeltaReader directly to implement Dictionnary::ord_to_term

[trinity-1686a]

fix #1852

[codecov-commenter]

Codecov Report

Merging #1928 (194683f) into main (a4f7ca8) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main    #1928      +/-   ##
==========================================
- Coverage   94.47%   94.46%   -0.01%     
==========================================
  Files         309      309              
  Lines       56512    56512              
==========================================
- Hits        53387    53386       -1     
- Misses       3125     3126       +1     

Impacted Files	Coverage Δ
sstable/src/dictionary.rs	87.74% <100.00%> (ø)
src/schema/schema.rs	98.92% <0.00%> (-0.14%)	⬇️

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