allow indexing a subset of columns
allow indexing a subset of columns

bgruening/gemini,bw2/gemini,heuermh/gemini,xuzetan/gemini,udp3f/gemini,heuermh/gemini,xuzetan/gemini,brentp/gemini,heuermh/gemini,udp3f/gemini,bpow/gemini,heuermh/gemini,brentp/gemini,bgruening/gemini,xuzetan/gemini,bpow/gemini,udp3f/gemini,bpow/gemini,bw2/gemini,arq5x/gemini,bw2/gemini,brentp/gemini,xuzetan/gemini,bgruening/gemini,udp3f/gemini,bw2/gemini,arq5x/gemini,arq5x/gemini,bpow/gemini,brentp/gemini,bgruening/gemini,arq5x/gemini