Simple Query Data Feed

def qapi = api.queryApi()
def exprs = qapi.exprs()

def t1 = qapi.tables().dataFeed("Gapminder")


return qapi.source(t1, [t1.attribute1.as("Country"), t1.attribute5.as("Fertility"), t1.attribute7.as("Population"), t1.attribute3.as("Year")],
        exprs.and(
                t1.attribute3.equal("1950")
        )
)

        .stream { it.collect { it } }