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awk 'NR==FNR{
# Read file2 first and then
# create hash using column1 ($1) as index and column2 ($2) as element
# if index $1 is already exists then append current line $2 to existing...

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awk 'NR==FNR{
h[$1] =( $1 in h ) ? h[$1] OFS $2 : $2
next
}
{
if(split(h[$1],part,OFS)>1)
{
for(i in part)
{
print $0 OFS part[i]
}...