basic support for EXPLAIN and EVAL

src/go/mongolib/explain/explain_test.go

@@ -84,6 +84,8 @@ func TestExplain(t *testing.T) {
 		"insert":           "Cannot explain cmd: insert",
 		"mapreduce":        "Cannot explain cmd: mapReduce",
 		"update":           "<nil>",
+		"explain":          "Cannot explain cmd: explain",
+		"eval":             "Cannot explain cmd: eval",
 	}
 
 	expectError := map[string]string{}

src/go/mongolib/fingerprinter/fingerprinter.go

@@ -81,20 +81,31 @@ func (f *Fingerprint) Fingerprint(doc proto.SystemProfile) (string, error) {
 	switch doc.Op {
 	case "remove", "update":
 		op = doc.Op
-		ns := strings.Split(doc.Ns, ".")
+		ns := strings.SplitN(doc.Ns, ".", 2)
 		if len(ns) == 2 {
 			collection = ns[1]
 		}
 	case "insert":
 		op = doc.Op
-		ns := strings.Split(doc.Ns, ".")
+		ns := strings.SplitN(doc.Ns, ".", 2)
 		if len(ns) == 2 {
 			collection = ns[1]
 		}
 		retKeys = []string{}
 	case "query":
+		// EXPLAIN MongoDB 2.6:
+		// "query" : {
+		//   "query" : {
+		//
+		//   },
+		//	 "$explain" : true
+		// },
+		if _, ok := doc.Query.Map()["$explain"]; ok {
+			op = "explain"
+			break
+		}
 		op = "find"
-		ns := strings.Split(doc.Ns, ".")
+		ns := strings.SplitN(doc.Ns, ".", 2)
 		if len(ns) == 2 {
 			collection = ns[1]
 		}
@@ -140,6 +151,12 @@ func (f *Fingerprint) Fingerprint(doc proto.SystemProfile) (string, error) {
 			}
 		case "geoNear":
 			retKeys = []string{}
+		case "explain":
+			retKeys = []string{}
+		case "$eval":
+			op = "eval"
+			collection = ""
+			retKeys = []string{}
 		}
 	}
 

src/go/mongolib/fingerprinter/fingerprinter_test.go

@@ -113,6 +113,16 @@ func TestFingerprints(t *testing.T) {
 		"distinct_3.2.16":         "DISTINCT coll a,b",
 		"distinct_3.4.7":          "DISTINCT coll a,b",
 		"distinct_3.5.11":         "DISTINCT coll a,b",
+		"explain_2.6.12":          "EXPLAIN",
+		"explain_3.0.15":          "EXPLAIN",
+		"explain_3.2.16":          "EXPLAIN",
+		"explain_3.4.7":           "EXPLAIN",
+		"explain_3.5.11":          "EXPLAIN",
+		"eval_2.6.12":             "EVAL",
+		"eval_3.0.15":             "EVAL",
+		"eval_3.2.16":             "EVAL",
+		"eval_3.4.7":              "EVAL",
+		"eval_3.5.11":             "EVAL",
 		"find_empty_2.6.12":       "FIND coll",
 		"find_empty_3.0.15":       "FIND coll",
 		"find_empty_3.2.16":       "FIND coll",

src/go/mongolib/proto/system.profile.go

@@ -120,6 +120,22 @@ func (self ExampleQuery) ExplainCmd() bson.D {
 		if cmd.Len() == 0 {
 			cmd = self.Query
 		}
+
+		// MongoDB 2.6:
+		//
+		// "query" : {
+		//   "query" : {
+		//
+		//   },
+		//	 "$explain" : true
+		// },
+		if _, ok := cmd.Map()["$explain"]; ok {
+			cmd = BsonD{
+				{"explain", ""},
+			}
+			break
+		}
+
 		if cmd.Len() == 0 || cmd[0].Name != "find" {
 			var filter interface{}
 			if cmd.Len() > 0 && cmd[0].Name == "query" {

src/go/tests/doc/script/profile/eval.js

@@ -0,0 +1 @@
+db.eval("db")

src/go/tests/doc/script/profile/explain.js

@@ -0,0 +1,3 @@
+var coll = db.coll
+
+coll.find().explain()