func (ctx *context) Canceled() bool                                                     { return false }
func (ctx *context) SetAnalyzer(_ string)                                               {}

func TestCombinedAnalyzer(t *testing.T) {
	g := NewWithT(t)

	col1 := newSchema("col1")
	col2 := newSchema("col2")
	col3 := newSchema("col3")
	col4 := newSchema("col4")