change-returned-UnknownProp-to-NULL (#1884)

vesoft-inc · Jan 17, 2023 · a2f22a4 · a2f22a4
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diff --git a/docs-2.0/2.quick-start/6.cheatsheet-for-ngql.md b/docs-2.0/2.quick-start/6.cheatsheet-for-ngql.md
@@ -252,7 +252,7 @@
   | `GO FROM "player102" OVER serve YIELD dst(edge)`                             | Returns the teams that player 102 serves.                                 |
   | `GO 2 STEPS FROM "player102" OVER follow YIELD dst(edge)`                    | Returns the friends of player 102 with 2 hops.                           |
   | `GO FROM "player100", "player102" OVER serve WHERE properties(edge).start_year > 1995 YIELD DISTINCT properties($$).name AS team_name, properties(edge).start_year AS start_year, properties($^).name AS player_name` | Adds a filter for the traversal.                                          |
-  | `GO FROM "player100" OVER follow, serve YIELD properties(edge).degree, properties(edge).start_year` | The following example traverses along with multiple edge types. If there is no value for a property, the output is `UNKNOWN_PROP`. |
+  | `GO FROM "player100" OVER follow, serve YIELD properties(edge).degree, properties(edge).start_year` | The following example traverses along with multiple edge types. If there is no value for a property, the output is `NULL`. |
   | `GO FROM "player100" OVER follow REVERSELY YIELD src(edge) AS destination` | The following example returns the neighbor vertices in the incoming direction of player 100.                           |
   | `GO FROM "player100" OVER follow REVERSELY YIELD src(edge) AS id | GO FROM $-.id OVER serve WHERE properties($^).age > 20 YIELD properties($^).name AS FriendOf, properties($$).name AS Team` | The following example retrieves the friends of player 100 and the teams that they serve.                     |
   | `GO FROM "player102" OVER follow YIELD dst(edge) AS both`    | The following example returns all the neighbor vertices of player 102.                               |

diff --git a/docs-2.0/3.ngql-guide/7.general-query-statements/3.go.md b/docs-2.0/3.ngql-guide/7.general-query-statements/3.go.md
@@ -109,15 +109,15 @@ nebula> GO FROM "player100", "player102" OVER serve \
 ```
 
 ```ngql
-# The following example traverses along with multiple edge types. If there is no value for a property, the output is UNKNOWN_PROP.
+# The following example traverses along with multiple edge types. If there is no value for a property, the output is `NULL`.
 nebula> GO FROM "player100" OVER follow, serve \
         YIELD properties(edge).degree, properties(edge).start_year;
 +-------------------------+-----------------------------+
 | properties(EDGE).degree | properties(EDGE).start_year |
 +-------------------------+-----------------------------+
-| 95                      | UNKNOWN_PROP                |
-| 95                      | UNKNOWN_PROP                |
-| UNKNOWN_PROP            | 1997                        |
+| 95                      | __NULL__                    |
+| 95                      | __NULL__                    |
+| __NULL__                | 1997                        |
 +-------------------------+-----------------------------+
 ```
 

diff --git a/docs-2.0/3.ngql-guide/8.clauses-and-options/limit.md b/docs-2.0/3.ngql-guide/8.clauses-and-options/limit.md
@@ -81,13 +81,13 @@ nebula> GO 3 STEPS FROM "player100" \
         OVER * \
         YIELD properties($$).name AS NAME, properties($$).age AS Age \
         LIMIT [3,3,3];
-+-----------------+--------------+
-| NAME            | Age          |
-+-----------------+--------------+
-| "Spurs"         | UNKNOWN_PROP |
-| "Tony Parker"   | 36           |
-| "Manu Ginobili" | 41           |
-+-----------------+--------------+
++-----------------+----------+
+| NAME            | Age      |
++-----------------+----------+
+| "Tony Parker"   | 36       |
+| "Manu Ginobili" | 41       |
+| "Spurs"         | __NULL__ |
++-----------------+----------+
 
 nebula> GO 3 STEPS FROM "player102" OVER * BIDIRECT\
         YIELD dst(edge) \

diff --git a/docs-2.0/3.ngql-guide/8.clauses-and-options/sample.md b/docs-2.0/3.ngql-guide/8.clauses-and-options/sample.md
@@ -23,26 +23,26 @@ nebula> GO 3 STEPS FROM "player100" \
         OVER * \
         YIELD properties($$).name AS NAME, properties($$).age AS Age \
         SAMPLE [1,2,3];
-+-----------------+--------------+
-| NAME            | Age          |
-+-----------------+--------------+
-| "Spurs"         | UNKNOWN_PROP |
-| "Tony Parker"   | 36           |
-| "Manu Ginobili" | 41           |
-+-----------------+--------------+
++-----------------+----------+
+| NAME            | Age      |
++-----------------+----------+
+| "Tony Parker"   | 36       |
+| "Manu Ginobili" | 41       |
+| "Spurs"         | __NULL__ |
++-----------------+----------+
 
 nebula> GO 1 TO 3 STEPS FROM "player100" \
         OVER * \
         YIELD properties($$).name AS NAME, properties($$).age AS Age \
         SAMPLE [2,2,2];
-+---------------------+-----+
-| NAME                | Age |
-+---------------------+-----+
-| "Manu Ginobili"     | 41  |
-| "Tony Parker"       | 36  |
-| "Tim Duncan"        | 42  |
-| "LaMarcus Aldridge" | 33  |
-| "Tony Parker"       | 36  |
-| "Tim Duncan"        | 42  |
-+---------------------+-----+
++-----------------+----------+
+| NAME            | Age      |
++-----------------+----------+
+| "Manu Ginobili" | 41       |
+| "Spurs"         | __NULL__ |
+| "Tim Duncan"    | 42       |
+| "Spurs"         | __NULL__ |
+| "Manu Ginobili" | 41       |
+| "Spurs"         | __NULL__ |
++-----------------+----------+
 ```