zsh : kex bash command promote not valid in this context

[beastpu]

zsh version 5.0.2
kex klog func not working

local command in zsh not identify string include space
for example: local val=$(echo "hello world"|awk '{print $1, $2}')
val equal to hello not hello world
i resolve it by double quote like this: "$(echo "hello world"|awk '{print $1, $2}') "