Relational expressions in lookup (#774)

* added relational expressions in lookup * update
vesoft-inc · Jul 27, 2021 · 0561277 · 0561277
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diff --git a/docs-2.0/3.ngql-guide/7.general-query-statements/5.lookup.md b/docs-2.0/3.ngql-guide/7.general-query-statements/5.lookup.md
@@ -70,13 +70,30 @@ nebula> LOOKUP ON player WHERE player.name == "Tony Parker";
 | 101      |
 ------------
 
-nebula> LOOKUP ON player WHERE player.name == "Tony Parker" \
+//正则表达式匹配
+nebula> LOOKUP ON player WHERE player.name =~ "^.{15,20}$" \
         YIELD player.name, player.age;
-=======================================
-| VertexID | player.name | player.age |
-=======================================
-| 101      | Tony Parker | 36         |
----------------------------------------
++-------------+----------------------+------------+
+| VertexID    | player.name          | player.age |
++-------------+----------------------+------------+
+| "player147" | "Amar'e Stoudemire"  | 36         |
++-------------+----------------------+------------+
+| "player144" | "Shaquille O'Neal"   | 47         |
++-------------+----------------------+------------+
+...
+
+nebula> LOOKUP ON player WHERE player.name CONTAINS toLower("L") \
+        YIELD player.name, player.age;
++-------------+---------------------+------------+
+| VertexID    | player.name         | player.age |
++-------------+---------------------+------------+
+| "player145" | "JaVale McGee"      | 31         |
++-------------+---------------------+------------+
+| "player144" | "Shaquille O'Neal"  | 47         |
++-------------+---------------------+------------+
+| "player102" | "LaMarcus Aldridge" | 33         |
++-------------+---------------------+------------+
+...
 
 nebula> LOOKUP ON player WHERE player.name == "Kobe Bryant" YIELD player.name AS name \
         | GO FROM $-.VertexID OVER serve \

diff --git a/docs-2.0/3.ngql-guide/8.clauses-and-options/where.md b/docs-2.0/3.ngql-guide/8.clauses-and-options/where.md
@@ -334,6 +334,21 @@ nebula> MATCH (v:player) \
 +-------------------------+-------+
 | "Joel Embiid"           | 25    |
 +-------------------------+-------+
+
+nebula> LOOKUP ON player WHERE player.age IN [25,28]  YIELD player.name, player.age;
++-------------+------------------+------------+
+| VertexID    | player.name      | player.age |
++-------------+------------------+------------+
+| "player135" | "Damian Lillard" | 28         |
++-------------+------------------+------------+
+| "player131" | "Paul George"    | 28         |
++-------------+------------------+------------+
+| "player130" | "Joel Embiid"    | 25         |
++-------------+------------------+------------+
+| "player123" | "Ricky Rubio"    | 28         |
++-------------+------------------+------------+
+| "player106" | "Kyle Anderson"  | 25         |
++-------------+------------------+------------+
 ```
 
 ### 结合NOT使用