rule: fix tests

Signed-off-by: Miguel Molina <[email protected]>

Author: erizocosmico

internal/rule/squashjoins_test.go

@@ -41,6 +41,9 @@ func TestAnalyzeSquashJoinsExchange(t *testing.T) {
 	project, ok := exchange.Child.(*plan.Project)
 	require.True(ok)
 
+	project, ok = project.Child.(*plan.Project)
+	require.True(ok)
+
 	rt, ok := project.Child.(*plan.ResolvedTable)
 	require.True(ok)
 
@@ -78,6 +81,9 @@ func TestAnalyzeSquashNaturalJoins(t *testing.T) {
 	project, ok := exchange.Child.(*plan.Project)
 	require.True(ok)
 
+	project, ok = project.Child.(*plan.Project)
+	require.True(ok)
+
 	filter, ok := project.Child.(*plan.Filter)
 	require.True(ok)