Make scan limit error more friendly.

src/graph/executor/query/ScanEdgesExecutor.cpp

@@ -26,7 +26,9 @@ folly::Future<Status> ScanEdgesExecutor::scanEdges() {
   StorageClient *client = qctx()->getStorageClient();
   auto *se = asNode<ScanEdges>(node());
   if (se->limit() < 0) {
-    return Status::Error("Scan edges must specify limit number.");
+    return Status::Error(
+        "Scan vertices or edges need to specify a limit number, "
+        "or limit number can not push down.");
   }
 
   time::Duration scanEdgesTime;

src/graph/executor/query/ScanVerticesExecutor.cpp

@@ -25,7 +25,9 @@ folly::Future<Status> ScanVerticesExecutor::scanVertices() {
 
   auto *sv = asNode<ScanVertices>(node());
   if (sv->limit() < 0) {
-    return Status::Error("Scan vertices must specify limit number.");
+    return Status::Error(
+        "Scan vertices or edges need to specify a limit number,"
+        " or limit number can not push down.");
   }
   StorageClient *storageClient = qctx()->getStorageClient();
 

tests/tck/features/match/Base.IntVid.feature

@@ -487,36 +487,36 @@ Feature: Basic match
       """
       MATCH (v) return v
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v{name: "Tim Duncan"}) return v
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v:player:bachelor) RETURN v
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v:player{age:23}:bachelor) RETURN v
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH () -[]-> (v) return *
       """
-    Then a ExecutionError should be raised at runtime: Scan edges must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH () --> (v) --> () return *
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     # The 0 step means node scan in fact, but p and t has no label or properties for index seek
     # So it's not workable now
     When executing query:
       """
       MATCH (p)-[:serve*0..3]->(t) RETURN p
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.

tests/tck/features/match/Base.feature

@@ -596,36 +596,36 @@ Feature: Basic match
       """
       MATCH (v) return v
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v{name: "Tim Duncan"}) return v
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v:player:bachelor) RETURN v
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v:player{age:23}:bachelor) RETURN v
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH () -[]-> (v) return *
       """
-    Then a ExecutionError should be raised at runtime: Scan edges must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH () --> (v) --> () return *
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     # The 0 step means node scan in fact, but p and t has no label or properties for index seek
     # So it's not workable now
     When executing query:
       """
       MATCH (p)-[:serve*0..3]->(t) RETURN p
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.

tests/tck/features/match/Scan.feature

@@ -84,14 +84,14 @@ Feature: Match seek by scan
       MATCH (v)
       RETURN v.name AS Name
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v{name: "Mary"})
       RETURN v.name AS Name
       LIMIT 3
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
 
   Scenario: query edge by scan
     When executing query:
@@ -147,25 +147,25 @@ Feature: Match seek by scan
       MATCH ()-[e]->()
       RETURN type(e) AS Type
       """
-    Then a ExecutionError should be raised at runtime: Scan edges must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v)-[e]->()
       RETURN v.name, type(e) AS Type
       LIMIT 3
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH ()-[e:is_teacher]-()
       RETURN type(e) AS Type, e.start_year AS StartYear, e.end_year AS EndYear
       LIMIT 3
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH ()-[e]-()
       RETURN type(e) AS Type, e.start_year AS StartYear, e.end_year AS EndYear
       LIMIT 3
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.

tests/tck/features/match/SeekByEdge.feature

@@ -1469,7 +1469,7 @@ Feature: Match seek by edge
       MATCH (p1)-[:teammate]->(p2)
       RETURN p1.name, id(p2)
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
 
   Scenario Outline: seek by edge in a single edge type space
     Given an empty graph
@@ -1490,16 +1490,16 @@ Feature: Match seek by edge
       MATCH (p1)-[]->(p2)
       RETURN p1.name, id(p2)
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (p1)-[b]->(p2)
       RETURN p1.name, id(p2)
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (p1)-[:edge_1]->(p2)
       RETURN p1.name, id(p2)
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.

tests/tck/features/match/SeekById.feature

@@ -222,30 +222,30 @@ Feature: Match seek by id
       WHERE NOT id(v) == 'Paul Gasol'
       RETURN v.name AS Name, v.age AS Age
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v)
       WHERE NOT id(v) IN ['James Harden', 'Jonathon Simmons', 'Klay Thompson', 'Dejounte Murray']
       RETURN v.name AS Name
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v)
       WHERE id(v) IN ['James Harden', 'Jonathon Simmons', 'Klay Thompson', 'Dejounte Murray']
       OR v.age == 23
       RETURN v.name AS Name
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v)
       WHERE id(v) == 'James Harden'
       OR v.age == 23
       RETURN v.name AS Name
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v)
@@ -266,7 +266,7 @@ Feature: Match seek by id
       WHERE id(v) IN ['James Harden', v.name]
       RETURN v.name AS Name
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
 
   Scenario: Start from end
     When executing query:

tests/tck/features/match/SeekById.intVid.feature

@@ -222,30 +222,30 @@ Feature: Match seek by id
       WHERE NOT id(v) == hash('Paul Gasol')
       RETURN v.name AS Name, v.age AS Age
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v)
       WHERE NOT id(v) IN [hash('James Harden'), hash('Jonathon Simmons'), hash('Klay Thompson'), hash('Dejounte Murray')]
       RETURN v.name AS Name
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v)
       WHERE id(v) IN [hash('James Harden'), hash('Jonathon Simmons'), hash('Klay Thompson'), hash('Dejounte Murray')]
       OR v.age == 23
       RETURN v.name AS Name
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v)
       WHERE id(v) == hash('James Harden')
       OR v.age == 23
       RETURN v.name AS Name
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
     When executing query:
       """
       MATCH (v)
@@ -259,7 +259,7 @@ Feature: Match seek by id
       WHERE id(v) IN [hash('James Harden'), v.name]
       RETURN v.name AS Name
       """
-    Then a ExecutionError should be raised at runtime: Scan vertices must specify limit number.
+    Then a ExecutionError should be raised at runtime: Scan vertices or edges need to specify a limit number, or limit number can not push down.
 
   Scenario: with arithmetic
     When executing query: