Details
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Bug
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Resolution: Fixed
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Major
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None
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Security Level: Public
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None
Description
Hi, trying to convert a query from N1QL to Swift-N1QL i received many errors and strange behavior when i start use constant values instead of field name.
N1QL query
SELECT
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key1 as key1,
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10 as key2,
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"" as key3,
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true as key4,
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'2020-02-12T15:18:24.573Z' as key5,
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["A","B"] as key6,
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1.1 as key7,
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{"A":"B"} as key8
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FROM `test-bucket`
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Query result
[
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{
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"key1": "value1",
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"key2": 10,
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"key3": "A",
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"key4": true,
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"key5": "2020-02-12T15:18:24.573Z",
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"key6": [
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"A",
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"B"
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],
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"key7": 1.1,
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"key8": {
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"A": "B"
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}
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}
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]
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So, if i try to do the same query from Couchbase Lite SDK (in this case Swift version), in the query result i missed the values of keys 3 and 5.
Query converted to Swift language
let query = QueryBuilder
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.select(
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SelectResult.expression(Expression.property("key1")),
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SelectResult.expression(Expression.value(10)).as("key2"),
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SelectResult.expression(Expression.value("A")).as("key3"),
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SelectResult.expression(Expression.value(true)).as("key4"),
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SelectResult.expression(Expression.value(Date())).as("key5"),
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SelectResult.expression(Expression.value(["A","B"])).as("key6"),
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SelectResult.expression(Expression.value(1.1)).as("key7"),
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SelectResult.expression(Expression.value(["A":"B"])).as("key8")
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)
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.from(DataSource.database(database))
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Result from CouchbaseLiteSwift
po array.first!.toDictionary()
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▿ 6 elements
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▿ 0 : 2 elements
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- key : "key1"
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- value : value1
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▿ 1 : 2 elements
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- key : "key2"
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- value : 10
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▿ 2 : 2 elements
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- key : "key4"
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- value : 1
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▿ 3 : 2 elements
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- key : "key6"
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▿ value : 2 elements
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- 0 : A
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- 1 : B
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▿ 4 : 2 elements
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- key : "key7"
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- value : 1.1
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▿ 5 : 2 elements
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- key : "key8"
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▿ value : 1 element
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▿ 0 : 2 elements
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- key : A
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- value : B
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As you can see the keys 3 and 5 is missing.
Trying to debug the problem i found that the expression SelectResult.expression(Expression.value("A")).as("key3") use the string "A" as a field path and not as a plain string.
In fact running query.explain() i get this result
SELECT fl_result(fl_value(_doc.body, 'key1')), fl_result(10) AS "key2", fl_result(fl_value(_doc.body, 'A')) AS "key3", fl_result(fl_bool(1)) AS "key4", fl_result(fl_value(_doc.body, '2020-02-12T16:38:45.738Z')) AS "key5", fl_result(array_of('A', 'B')) AS "key6", fl_result(1.1000000000000001) AS "key7", fl_result(dict_of('A', 'B')) AS "key8" FROM kv_default AS _doc WHERE (_doc.flags & 1 = 0)
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2|0|0| SCAN TABLE kv_default AS _doc
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{"WHAT":[[".key1"],["AS",10,"key2"],["AS","A","key3"],["AS",true,"key4"],["AS","2020-02-12T16:38:45.738Z","key5"],["AS",["[]","A","B"],"key6"],["AS",1.1000000000000001,"key7"],["AS",{"A":"B"},"key8"]]}
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Why key3 is evaluated in this way fl_result(fl_value(_doc.body, 'A')) AS "key3" and not in this way fl_result(fl_value('A')) AS "key3"?
Furthermore if i try to use an alias for database then i receive a fatal error
2020-02-12 18:13:29.386587+0100 CouchbaseQueryIssueTestCase[99001:1630323] CouchbaseLite Database WARNING: Invalid LiteCore query: property 'A.' does not begin with a declared 'AS' alias
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Error Domain=CouchbaseLite Code=23 "property 'A.' does not begin with a declared 'AS' alias" UserInfo={NSLocalizedDescription=property 'A.' does not begin with a declared 'AS' alias}
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Test case to reproduce the issue
let database: Database
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do {
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database = try Database(name: "testDB")
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} catch {
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fatalError("Error opening database")
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}
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let mutableDoc = MutableDocument()
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.setString("value1", forKey: "key1")
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do {
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try database.saveDocument(mutableDoc)
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} catch {
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fatalError("Error saving document")
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}
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let query = QueryBuilder
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.select(
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SelectResult.expression(Expression.property("key1")),
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SelectResult.expression(Expression.value(10)).as("key2"),
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SelectResult.expression(Expression.value("A")).as("key3"),
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SelectResult.expression(Expression.value(true)).as("key4"),
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SelectResult.expression(Expression.value(Date())).as("key5"),
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SelectResult.expression(Expression.value(["A","B"])).as("key6"),
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SelectResult.expression(Expression.value(1.1)).as("key7"),
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SelectResult.expression(Expression.value(["A":"B"])).as("key8")
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)
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.from(DataSource.database(database))
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do {
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print(try query.explain())
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let array = try query.execute().allResults()
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let keysCount = array.first!.keys.count
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let valuesCount = array.first!.toDictionary().map { (_,value) in value }.count
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assert(keysCount == valuesCount)
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} catch {
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print(error)
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}
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This issue can be reproduced also with Couchbase Lite Java CE & EE so i think the problem is in the core layer.