pmdaoracle: use direct splice over indirect array copy/remap
pmdaoracle: use direct splice over indirect array copy/remap

Reduces the memory footprint and simplifies the code.

wuliming/pcp,wuliming/pcp,wuliming/pcp,adfernandes/pcp,adfernandes/pcp,wuliming/pcp,wuliming/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,wuliming/pcp,wuliming/pcp,wuliming/pcp,adfernandes/pcp