feat(query): enable min/max pushdown (#20994)

* feat(query): enable min/max pushdown

* fix(query): fix the group last pushdown to use descending cursors

* test(storage): add read group test with no agg

Co-authored-by: Jonathan A. Sternberg <jonathan@influxdata.com>

query/stdlib/influxdata/influxdb/min_max_influxdb_test.flux

@@ -0,0 +1,61 @@
+package influxdb_test
+
+import "testing/expect"
+
+option now = () => (2030-01-01T00:00:00Z)
+
+testcase push_down_min_bare extends "flux/planner/group_min_test" {
+    expect.planner(rules: [
+        "PushDownGroupAggregateRule": 1,
+    ])
+    group_min_test.group_min_bare()
+}
+
+testcase push_down_min_bare_host extends "flux/planner/group_min_test" {
+    expect.planner(rules: [
+        "PushDownGroupAggregateRule": 1,
+    ])
+    group_min_test.group_min_bare_host()
+}
+
+testcase push_down_min_bare_field extends "flux/planner/group_min_test" {
+    expect.planner(rules: [
+        "PushDownGroupAggregateRule": 1,
+    ])
+    group_min_test.group_min_bare_field()
+}
+
+testcase push_down_max_bare extends "flux/planner/group_max_test" {
+    expect.planner(rules: [
+        "PushDownGroupAggregateRule": 1,
+    ])
+    group_max_test.group_max_bare()
+}
+
+testcase push_down_max_bare_host extends "flux/planner/group_max_test" {
+    expect.planner(rules: [
+        "PushDownGroupAggregateRule": 1,
+    ])
+    group_max_test.group_max_bare_host()
+}
+
+testcase push_down_max_bare_field extends "flux/planner/group_max_test" {
+    expect.planner(rules: [
+        "PushDownGroupAggregateRule": 1,
+    ])
+    group_max_test.group_max_bare_field()
+}
+
+testcase push_down_table_test_min extends "flux/planner/group_min_max_table_test" {
+    expect.planner(rules: [
+        "PushDownGroupAggregateRule": 1,
+    ])
+    group_min_max_table_test.group_min_table()
+}
+
+testcase push_down_table_test_max extends "flux/planner/group_min_max_table_test" {
+    expect.planner(rules: [
+        "PushDownGroupAggregateRule": 1,
+    ])
+    group_min_max_table_test.group_max_table()
+}

query/stdlib/influxdata/influxdb/rules.go

@@ -30,7 +30,7 @@ func init() {
 		PushDownWindowAggregateByTimeRule{},
 		PushDownBareAggregateRule{},
 		GroupWindowAggregateTransposeRule{},
-		// PushDownGroupAggregateRule{},
+		PushDownGroupAggregateRule{},
 	)
 	plan.RegisterLogicalRules(
 		MergeFiltersRule{},