Extract from PDO LOBs

[thomascorthals]

Closes #1066.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (43a3451) 97.49% compared to head (bc1a2c4) 97.49%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1083   +/-   ##
=======================================
  Coverage   97.49%   97.49%           
=======================================
  Files         389      389           
  Lines       10140    10142    +2     
=======================================
+ Hits         9886     9888    +2     
  Misses        254      254           

Flag	Coverage Δ
unittests	97.49% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
src/Core/Client/Adapter/AdapterHelper.php	100.00% <100.00%> (ø)
src/Core/Client/Request.php	100.00% <100.00%> (ø)
src/QueryType/Extract/RequestBuilder.php	100.00% <100.00%> (ø)

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