topdown: fix wall clock time init for PartialRun()

Fixes #7490.

Signed-off-by: Stephan Renatus <[email protected]>

Author: srenatus

Diff for: v1/topdown/query.go

@@ -344,7 +344,7 @@ func (q *Query) PartialRun(ctx context.Context) (partials []ast.Body, support []
 	if q.seed == nil {
 		q.seed = rand.Reader
 	}
-	if !q.time.IsZero() {
+	if q.time.IsZero() {
 		q.time = time.Now()
 	}
 	if q.metrics == nil {

Diff for: v1/topdown/topdown_partial_test.go

@@ -4059,6 +4059,15 @@ func TestTopDownPartialEval(t *testing.T) {
 			},
 			wantQueries: []string{`"x" = input.x`},
 		},
+		{
+			note:                     "nondeterministic builtin time.now_ns() properly initiated",
+			query:                    "data.test.p",
+			nondeterministicBuiltins: true,
+			modules: []string{`package test
+			p if time.now_ns() > 0`,
+			},
+			wantQueries: []string{""}, // unconditional true
+		},
 	}
 
 	ctx := context.Background()