diff --git a/ast/compile.go b/ast/compile.go
index 098f30f674..811838054f 100644
--- a/ast/compile.go
+++ b/ast/compile.go
@@ -1794,7 +1794,7 @@ func getComprehensionIndex(dbg debug.Debug, arity func(Ref) int, candidates VarS
 	unsafe := body.Vars(SafetyCheckVisitorParams).Diff(outputs).Diff(ReservedVars)
 
 	if len(unsafe) > 0 {
-		dbg.Printf("%s: unsafe vars: %v", expr.Location, unsafe)
+		dbg.Printf("%s: comprehension index: unsafe vars: %v", expr.Location, unsafe)
 		return nil
 	}
 
@@ -1804,7 +1804,7 @@ func getComprehensionIndex(dbg debug.Debug, arity func(Ref) int, candidates VarS
 	regressionVis := newComprehensionIndexRegressionCheckVisitor(candidates)
 	regressionVis.Walk(body)
 	if regressionVis.worse {
-		dbg.Printf("%s: output vars intersect candidates", expr.Location)
+		dbg.Printf("%s: comprehension index: output vars intersect candidates", expr.Location)
 		return nil
 	}
 
@@ -1814,7 +1814,7 @@ func getComprehensionIndex(dbg debug.Debug, arity func(Ref) int, candidates VarS
 	nestedVis := newComprehensionIndexNestedCandidateVisitor(candidates)
 	nestedVis.Walk(body)
 	if nestedVis.found {
-		dbg.Printf("%s: nested comprehensions close over candidates", expr.Location)
+		dbg.Printf("%s: comprehension index: nested comprehensions close over candidates", expr.Location)
 		return nil
 	}
 
@@ -1824,7 +1824,7 @@ func getComprehensionIndex(dbg debug.Debug, arity func(Ref) int, candidates VarS
 	// empty, there is no indexing to do.
 	indexVars := candidates.Intersect(outputs)
 	if len(indexVars) == 0 {
-		dbg.Printf("%s: no index vars", expr.Location)
+		dbg.Printf("%s: comprehension index: no index vars", expr.Location)
 		return nil
 	}
 
@@ -1846,7 +1846,7 @@ func getComprehensionIndex(dbg debug.Debug, arity func(Ref) int, candidates VarS
 			debugRes[i] = r
 		}
 	}
-	dbg.Printf("%s: comprehension index built with keys: %v", expr.Location, debugRes)
+	dbg.Printf("%s: comprehension index: built with keys: %v", expr.Location, debugRes)
 	return &ComprehensionIndex{Term: term, Keys: result}
 }
 
diff --git a/compile/compile.go b/compile/compile.go
index 5dfc71269f..5797125c99 100644
--- a/compile/compile.go
+++ b/compile/compile.go
@@ -629,10 +629,12 @@ func (o *optimizer) Do(ctx context.Context) error {
 			unknowns = o.findUnknowns()
 		}
 
+		required := o.findRequiredDocuments(e)
+
 		r := rego.New(
 			rego.ParsedQuery(ast.NewBody(ast.Equality.Expr(resultsym, e))),
 			rego.PartialNamespace(o.nsprefix),
-			rego.DisableInlining(o.findRequiredDocuments(e)),
+			rego.DisableInlining(required),
 			rego.ShallowInlining(o.shallow),
 			rego.SkipPartialNamespace(true),
 			rego.ParsedUnknowns(unknowns),
@@ -640,6 +642,15 @@ func (o *optimizer) Do(ctx context.Context) error {
 			rego.Store(store),
 		)
 
+		o.debug.Printf("optimizer: entrypoint: %v", e)
+		o.debug.Printf("  partial-namespace: %v", o.nsprefix)
+		o.debug.Printf("  disable-inlining: %v", required)
+		o.debug.Printf("  shallow-inlining: %v", o.shallow)
+
+		for i := range unknowns {
+			o.debug.Printf("  unknown: %v", unknowns[i])
+		}
+
 		pq, err := r.Partial(ctx)
 		if err != nil {
 			return err
@@ -738,7 +749,6 @@ func (o *optimizer) findUnknowns() []*ast.Term {
 				return true
 			}
 			if !refs.ContainsPrefix(prefix) {
-				o.debug.Printf("%s: marking %v as unknown", x[0].Location, prefix)
 				unknowns.AddPrefix(prefix)
 			}
 			return false