Made union executors stateless - no need for reset
Made union executors stateless - no need for reset

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