Fix error in sql_coverage stats.
Fix error in sql_coverage stats.

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