scaffold for volume server query feature

weed/query/json/query_json.go

@@ -0,0 +1,5 @@
+package json
+
+func QueryJson(jsonLine string, query string) (jsonOutput string) {
+	return jsonLine
+}

weed/query/json/query_json_test.go

@@ -0,0 +1,73 @@
+package json
+
+import (
+	"testing"
+
+	"github.com/tidwall/gjson"
+)
+
+func TestGjson(t *testing.T) {
+	data := `
+	{
+		"quiz": {
+			"sport": {
+				"q1": {
+					"question": "Which one is correct team name in NBA?",
+					"options": [
+						"New York Bulls",
+						"Los Angeles Kings",
+						"Golden State Warriros",
+						"Huston Rocket"
+					],
+					"answer": "Huston Rocket"
+				}
+			},
+			"maths": {
+				"q1": {
+					"question": "5 + 7 = ?",
+					"options": [
+						"10",
+						"11",
+						"12",
+						"13"
+					],
+					"answer": "12"
+				},
+				"q2": {
+					"question": "12 - 8 = ?",
+					"options": [
+						"1",
+						"2",
+						"3",
+						"4"
+					],
+					"answer": "4"
+				}
+			}
+		}
+	}
+
+	{
+		"fruit": "Apple",
+		"size": "Large",
+		"quiz": "Red"
+	}
+
+`
+
+	projections := []string{"quiz","fruit"}
+
+	gjson.ForEachLine(data, func(line gjson.Result) bool{
+		println(line.String())
+		println("+++++++++++")
+		results := gjson.GetMany(line.Raw, projections...)
+		for _, result := range results {
+			println(result.Index, result.Type, result.String())
+		}
+		println("-----------")
+		return true
+	})
+
+
+
+}