What is the usage difference between properties($^) and src(edge)?

[abby-cyber]

Environment: 3.3.0

I want to use the go statement starting from "2" over sell to find "1".

I used two functions properties($^) and src(edge), but the returned vids are different.

What is the difference in the usage of these two functions properties($^) and src(edge)?

[nevermore3]

src(edge) always represents the src in the edge, and $^ represents the vertex from which to expand

(root@nebula) [nba]> go from "Tim Duncan" over * reversely  yield $^ as src, $$ as dst, src(edge) as srcEdge, dst(edge) as dstEdge, edge as e
+-------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------+---------------------+--------------+---------------------------------------------------------------------------------+
| src                                                                                                         | dst                                                               | srcEdge             | dstEdge      | e                                                                               |
+-------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------+---------------------+--------------+---------------------------------------------------------------------------------+
| ("Tim Duncan" :bachelor{name: "Tim Duncan", speciality: "psychology"} :player{age: 42, name: "Tim Duncan"}) | ("Aron Baynes" :player{age: 32, name: "Aron Baynes"})             | "Aron Baynes"       | "Tim Duncan" | [:like "Aron Baynes"->"Tim Duncan" @0 {likeness: 80}]                           |
| ("Tim Duncan" :bachelor{name: "Tim Duncan", speciality: "psychology"} :player{age: 42, name: "Tim Duncan"}) | ("Boris Diaw" :player{age: 36, name: "Boris Diaw"})               | "Boris Diaw"        | "Tim Duncan" | [:like "Boris Diaw"->"Tim Duncan" @0 {likeness: 80}]                            |
| ("Tim Duncan" :bachelor{name: "Tim Duncan", speciality: "psychology"} :player{age: 42, name: "Tim Duncan"}) | ("Danny Green" :player{age: 31, name: "Danny Green"})             | "Danny Green"       | "Tim Duncan" | [:like "Danny Green"->"Tim Duncan" @0 {likeness: 70}]                           |
| ("Tim Duncan" :bachelor{name: "Tim Duncan", speciality: "psychology"} :player{age: 42, name: "Tim Duncan"}) | ("Dejounte Murray" :player{age: 29, name: "Dejounte Murray"})     | "Dejounte Murray"   | "Tim Duncan" | [:like "Dejounte Murray"->"Tim Duncan" @0 {likeness: 99}]                       |
| ("Tim Duncan" :bachelor{name: "Tim Duncan", speciality: "psychology"} :player{age: 42, name: "Tim Duncan"}) | ("LaMarcus Aldridge" :player{age: 33, name: "LaMarcus Aldridge"}) | "LaMarcus Aldridge" | "Tim Duncan" | [:like "LaMarcus Aldridge"->"Tim Duncan" @0 {likeness: 75}]                     |
| ("Tim Duncan" :bachelor{name: "Tim Duncan", speciality: "psychology"} :player{age: 42, name: "Tim Duncan"}) | ("Manu Ginobili" :player{age: 41, name: "Manu Ginobili"})         | "Manu Ginobili"     | "Tim Duncan" | [:like "Manu Ginobili"->"Tim Duncan" @0 {likeness: 90}]                         |
| ("Tim Duncan" :bachelor{name: "Tim Duncan", speciality: "psychology"} :player{age: 42, name: "Tim Duncan"}) | ("Marco Belinelli" :player{age: 32, name: "Marco Belinelli"})     | "Marco Belinelli"   | "Tim Duncan" | [:like "Marco Belinelli"->"Tim Duncan" @0 {likeness: 55}]                       |
| ("Tim Duncan" :bachelor{name: "Tim Duncan", speciality: "psychology"} :player{age: 42, name: "Tim Duncan"}) | ("Shaquille O'Neal" :player{age: 47, name: "Shaquille O'Neal"})   | "Shaquille O'Neal"  | "Tim Duncan" | [:like "Shaquille O'Neal"->"Tim Duncan" @0 {likeness: 80}]                      |
| ("Tim Duncan" :bachelor{name: "Tim Duncan", speciality: "psychology"} :player{age: 42, name: "Tim Duncan"}) | ("Tiago Splitter" :player{age: 34, name: "Tiago Splitter"})       | "Tiago Splitter"    | "Tim Duncan" | [:like "Tiago Splitter"->"Tim Duncan" @0 {likeness: 80}]                        |
| ("Tim Duncan" :bachelor{name: "Tim Duncan", speciality: "psychology"} :player{age: 42, name: "Tim Duncan"}) | ("Tony Parker" :player{age: 36, name: "Tony Parker"})             | "Tony Parker"       | "Tim Duncan" | [:like "Tony Parker"->"Tim Duncan" @0 {likeness: 95}]                           |
| ("Tim Duncan" :bachelor{name: "Tim Duncan", speciality: "psychology"} :player{age: 42, name: "Tim Duncan"}) | ("Manu Ginobili" :player{age: 41, name: "Manu Ginobili"})         | "Manu Ginobili"     | "Tim Duncan" | [:teammate "Manu Ginobili"->"Tim Duncan" @0 {end_year: 2016, start_year: 2002}] |
| ("Tim Duncan" :bachelor{name: "Tim Duncan", speciality: "psychology"} :player{age: 42, name: "Tim Duncan"}) | ("Tony Parker" :player{age: 36, name: "Tony Parker"})             | "Tony Parker"       | "Tim Duncan" | [:teammate "Tony Parker"->"Tim Duncan" @0 {end_year: 2016, start_year: 2001}]   |
+-------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------+---------------------+--------------+---------------------------------------------------------------------------------+