Remove unused variables.
Remove unused variables.

zuowang/voltdb,migue/voltdb,ingted/voltdb,zuowang/voltdb,kumarrus/voltdb,creative-quant/voltdb,zuowang/voltdb,wolffcm/voltdb,flybird119/voltdb,kobronson/cs-voltdb,wolffcm/voltdb,migue/voltdb,ingted/voltdb,kobronson/cs-voltdb,VoltDB/voltdb,VoltDB/voltdb,kumarrus/voltdb,kumarrus/voltdb,kobronson/cs-voltdb,kobronson/cs-voltdb,flybird119/voltdb,kumarrus/voltdb,ingted/voltdb,kobronson/cs-voltdb,deerwalk/voltdb,flybird119/voltdb,simonzhangsm/voltdb,kobronson/cs-voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,migue/voltdb,VoltDB/voltdb,creative-quant/voltdb,creative-quant/voltdb,kobronson/cs-voltdb,kumarrus/voltdb,zuowang/voltdb,simonzhangsm/voltdb,kumarrus/voltdb,flybird119/voltdb,deerwalk/voltdb,deerwalk/voltdb,paulmartel/voltdb,creative-quant/voltdb,kumarrus/voltdb,paulmartel/voltdb,zuowang/voltdb,VoltDB/voltdb,simonzhangsm/voltdb,kumarrus/voltdb,migue/voltdb,wolffcm/voltdb,creative-quant/voltdb,ingted/voltdb,migue/voltdb,deerwalk/voltdb,kobronson/cs-voltdb,creative-quant/voltdb,wolffcm/voltdb,flybird119/voltdb,deerwalk/voltdb,flybird119/voltdb,ingted/voltdb,VoltDB/voltdb,wolffcm/voltdb,paulmartel/voltdb,ingted/voltdb,paulmartel/voltdb,migue/voltdb,wolffcm/voltdb,wolffcm/voltdb,simonzhangsm/voltdb,migue/voltdb,paulmartel/voltdb,zuowang/voltdb,VoltDB/voltdb,flybird119/voltdb,deerwalk/voltdb,deerwalk/voltdb,deerwalk/voltdb,ingted/voltdb,migue/voltdb,simonzhangsm/voltdb,paulmartel/voltdb,ingted/voltdb,flybird119/voltdb,simonzhangsm/voltdb,creative-quant/voltdb,wolffcm/voltdb,creative-quant/voltdb,paulmartel/voltdb,zuowang/voltdb,VoltDB/voltdb,paulmartel/voltdb,zuowang/voltdb