8000 AQL insert query fails to concatenate string an counter value · Issue #3849 · arangodb/arangodb · GitHub
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Simran-B opened this issue Nov 30, 2017 · 3 comments
Closed
5 tasks done

AQL insert query fails to concatenate string an counter value #3849

Simran-B opened this issue Nov 30, 2017 · 3 comments
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@jsteemann
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1 Question 2 Solved Resolution 3 AQL Query language related

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@Simran-B
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Simran-B commented Nov 30, 2017 •
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my environment running ArangoDB

I'm using the latest ArangoDB of the respective release series:

  • 3.2.8

Mode:

  • Single-Server

Storage-Engine:

  • mmfiles

On this operating system:

  • Windows, version: 10

this is an AQL-related issue:

I'm issuing AQL via:

  • web interface with this browser: Chrome 62.0.3202.94 running on this OS: Windows 10

I've run db._explain("<my aql query>") and it didn't shed more light on this.
The AQL query in question is:

FOR i IN 1..3
INSERT {title: CONCAT("Foo" + i), _key: TO_STRING(i)} INTO test RETURN NEW

The issue can be reproduced using this dataset:
A blank collection "test"

These are the steps to reproduce:

  1. open the browser on http://127.0.0.1:8529
  2. log in as root
  3. use database [x] _system
  4. paste query and run

The following problem occurs:
It does not concatenate the title string like "Foo" + number, but instead, it becomes "number" only.

[
  {
    "_key": "1",
    "_id": "test/1",
    "_rev": "_W-yM97m---",
    "title": "1"
  },
  {
    "_key": "2",
    "_id": "test/2",
    "_rev": "_W-yM97m--_",
    "title": "2"
  },
  {
    "_key": "3",
    "_id": "test/3",
    "_rev": "_W-yM97m--A",
    "title": "3"
  }
]

The execution plan looks fine however:

Execution plan:
 Id   NodeType            Est.   Comment
  1   SingletonNode          1   * ROOT
  2   CalculationNode        1     - LET #2 = 1 .. 3   /* range */   /* simple expression */
  3   EnumerateListNode      3     - FOR i IN #2   /* list iteration */
  4   CalculationNode        3       - LET #4 = { "title" : CONCAT(("Foo" + i)), "_key" : TO_STRING(i) }   /* simple expression */
  5   InsertNode             3       - INSERT #4 IN test
  6   ReturnNode             3       - RETURN $NEW

Indexes used:
 none

Optimization rules applied:
 Id   RuleName
  1   remove-data-modification-out-variables

Write query options:
 Option                   Value
 ignoreErrors             false
 waitForSync              false
 nullMeansRemove          false
 mergeObjects             true
 ignoreDocumentNotFound   false
 readCompleteInput        false
 useIsRestore             false
 consultAqlWriteFilter    false
@Simran-B Simran-B added 1 Bug 3 AQL Query language related labels Nov 30, 2017
@jsteemann
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Shouldn't it be CONCAT("Foo", i) instead of CONCAT("Foo" + i)?

@jsteemann
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Then it will work just fine. The "+" operator will not concatenate strings in AQL. It is an arithmetic operator.

@Simran-B
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Yeah, sorry for that stupid mistake.

@Simran-B Simran-B added 1 Question 2 Solved Resolution and removed 1 Bug labels Nov 30, 2017
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