Review: Needs Fixing

1. The following query constructs the wrong dataguide (and returns the wrong 
result):

jsoniq version "1.0";

declare variable $doc1 :=
"
  {
    \"foo\" :  { \"name\" : \"moto\", \"price\" : 100 },
    \"boo\" :  { \"name\" : \"car\",  \"price\" : 1000 }
  }
";


let $v := exactly-one(jn:parse-json($doc1))
return
  if ($v.foo.name eq "moto")
  then
   $v
  else
   ()

2. The following query does not construct any dataguide at all, although it 
should:

jsoniq version "1.0";

import module namespace ddl = 
"http://www.zorba-xquery.com/modules/store/dynamic/collections/ddl";;
import module namespace dml = 
"http://www.zorba-xquery.com/modules/store/dynamic/collections/dml";;

declare variable $test external := 1;

ddl:create(xs:QName("sales"));
dml:insert-last(xs:QName("sales"),
  ( { "product" :  { "name" : "broiler",
                     "price" : 100 
                   },
      "category1" : { "category3" :
                       { "category4" : "value4" }
                   } 
    }
  )
);


(
exactly-one
(
if ($test)
then
 dml:collection(xs:QName("sales"))[1]
else
 dml:collection(xs:QName("sales"))[2]
)
).category1


3. Window variables are not taken into account in getClauseVar

4. The implementation of the JsonDataguide rule does too much copying and 
allocations of dataguides. I have the feeling that this is not necessary. For 
example, what about the following approach? 
- There is only one dataguide_cb allocated per JsonDataguide application. It 
contains one entry for each json "source" encountered during the application of 
the rule.
- There is also a single map from expr* to std::vector<expr*>. The map contains 
one entry for each expr that may receive return json items coming from a json 
"source". The value of the entry is the set of "sources" for the key expr.
I may be missing something, but if this works, it will eliminate all 
allocations and copies.


-- 
https://code.launchpad.net/~zorba-coders/zorba/use-dataguide/+merge/176385
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