Markos Zaharioudakis has proposed merging lp:~zorba-coders/zorba/expr-matching 
into lp:zorba.

Commit message:
enhanced index key matching

Requested reviews:
  Markos Zaharioudakis (markos-za)

For more details, see:
https://code.launchpad.net/~zorba-coders/zorba/expr-matching/+merge/149949

enhanced index key matching
-- 
https://code.launchpad.net/~zorba-coders/zorba/expr-matching/+merge/149949
Your team Zorba Coders is subscribed to branch lp:zorba.
=== modified file 'src/compiler/rewriter/rules/index_matching_rule.cpp'
--- src/compiler/rewriter/rules/index_matching_rule.cpp	2013-02-21 06:30:02 +0000
+++ src/compiler/rewriter/rules/index_matching_rule.cpp	2013-02-21 22:39:36 +0000
@@ -967,6 +967,9 @@
     expr* vexpr,
     expr::substitution_t& subst)
 {
+  TypeManager* tm = qexpr->get_type_manager();
+  RootTypeManager& rtm = GENV_TYPESYSTEM;
+
   if (qexpr->get_expr_kind() == promote_expr_kind &&
       vexpr->get_expr_kind() == promote_expr_kind)
   {
@@ -975,9 +978,6 @@
     xqtref_t qtype = qe->get_return_type();
     xqtref_t vtype = ve->get_target_type();
 
-    TypeManager* tm = qe->get_type_manager();
-    RootTypeManager& rtm = GENV_TYPESYSTEM;
-
     if (TypeOps::is_subtype(tm, *vtype, *qtype) ||
         (TypeOps::is_subtype(tm, *qtype, *rtm.UNTYPED_ATOMIC_TYPE_STAR) &&
          TypeOps::is_subtype(tm, *vtype, *rtm.STRING_TYPE_STAR)))
@@ -994,9 +994,6 @@
     xqtref_t qtype = qexpr->get_return_type();
     xqtref_t vtype = ve->get_target_type();
 
-    TypeManager* tm = qexpr->get_type_manager();
-    RootTypeManager& rtm = GENV_TYPESYSTEM;
-
     if (TypeOps::is_subtype(tm, *qtype, *vtype) ||
         (TypeOps::is_subtype(tm, *qtype, *rtm.UNTYPED_ATOMIC_TYPE_STAR) &&
          TypeOps::is_subtype(tm, *vtype, *rtm.STRING_TYPE_STAR)))
@@ -1011,6 +1008,18 @@
   {
     treat_expr* ve = static_cast<treat_expr*>(vexpr);
 
+    if (qexpr->get_expr_kind() == promote_expr_kind)
+    {
+      promote_expr* qe = static_cast<promote_expr*>(qexpr);
+      xqtref_t qtype = qe->get_return_type();
+      xqtref_t vtype = ve->get_target_type();
+
+      if (TypeOps::is_subtype(tm, *vtype, *qtype))
+      {
+        return expr_tools::match_exact(qe->get_input(), ve->get_input(), subst);
+      }
+    }
+
     return expr_tools::match_exact(qexpr, ve->get_input(), subst);
   }
 

=== added file 'test/rbkt/ExpCompilerResults/IterPlan/zorba/index/match_veq_09.iter'
--- test/rbkt/ExpCompilerResults/IterPlan/zorba/index/match_veq_09.iter	1970-01-01 00:00:00 +0000
+++ test/rbkt/ExpCompilerResults/IterPlan/zorba/index/match_veq_09.iter	2013-02-21 22:39:36 +0000
@@ -0,0 +1,113 @@
+Iterator tree for index:
+<flwor::FLWORIterator>
+  <ForVariable name="$$context-item">
+    <ZorbaCollectionIterator>
+      <SingletonIterator value="xs:QName(http://28.io/collections,db28,faqs)"/>
+    </ZorbaCollectionIterator>
+  </ForVariable>
+  <ReturnClause>
+    <ValueIndexEntryBuilderIterator>
+      <ForVarIterator varname="$$context-item"/>
+      <TreatIterator type="xs:integer" quant="">
+        <FnDataIterator>
+          <JSONObjectValueIterator>
+            <ForVarIterator varname="$$context-item"/>
+            <SingletonIterator value="xs:string(question_id)"/>
+          </JSONObjectValueIterator>
+        </FnDataIterator>
+      </TreatIterator>
+    </ValueIndexEntryBuilderIterator>
+  </ReturnClause>
+</flwor::FLWORIterator>
+
+Iterator tree for const-folded expr:
+<OrIterator>
+  <SingletonIterator value="xs:boolean(false)"/>
+  <SingletonIterator value="xs:boolean(false)"/>
+  <SingletonIterator value="xs:boolean(false)"/>
+</OrIterator>
+
+Iterator tree for main query:
+<SequentialIterator>
+  <ApplyIterator>
+    <ZorbaCreateCollectionIterator>
+      <SingletonIterator value="xs:QName(http://28.io/collections,db28,faqs)"/>
+    </ZorbaCreateCollectionIterator>
+  </ApplyIterator>
+  <ApplyIterator>
+    <ZorbaCreateCollectionIterator>
+      <SingletonIterator value="xs:QName(http://28.io/collections,db28,answers)"/>
+    </ZorbaCreateCollectionIterator>
+  </ApplyIterator>
+  <ApplyIterator>
+    <CreateIndexIterator>
+      <SingletonIterator value="xs:QName(http://28.io/collections,db28,question-id-idx)"/>
+    </CreateIndexIterator>
+  </ApplyIterator>
+  <flwor::TupleStreamIterator>
+    <flwor::OrderByIterator>
+      <OrderByForVariable inputVar="id : "/>
+      <OrderByForVariable inputVar="count : "/>
+      <OrderBySpec>
+        <ForVarIterator varname="count"/>
+      </OrderBySpec>
+      <flwor::ForIterator>
+        <ForVariable name="count"/>
+        <flwor::GroupByIterator>
+          <flwor::ForIterator>
+            <ForVariable name="answers"/>
+            <flwor::TupleSourceIterator/>
+            <ZorbaCollectionIterator>
+              <SingletonIterator value="xs:QName(http://28.io/collections,db28,answers)"/>
+            </ZorbaCollectionIterator>
+          </flwor::ForIterator>
+          <Spec>
+            <TreatIterator quant="?">
+              <FnDataIterator>
+                <JSONObjectValueIterator>
+                  <ForVarIterator varname="answers"/>
+                  <SingletonIterator value="xs:string(question_id)"/>
+                </JSONObjectValueIterator>
+              </FnDataIterator>
+            </TreatIterator>
+            <GroupVariable/>
+          </Spec>
+          <Spec>
+            <ForVarIterator varname="answers"/>
+            <NonGroupVariable/>
+          </Spec>
+        </flwor::GroupByIterator>
+        <FnCountIterator>
+          <LetVarIterator varname="answers"/>
+        </FnCountIterator>
+      </flwor::ForIterator>
+    </flwor::OrderByIterator>
+    <JSONDirectObjectIterator>
+      <SingletonIterator value="xs:string(title)"/>
+      <SingletonIterator value="xs:string(answer_count)"/>
+      <JSONBoxIterator>
+        <flwor::FLWORIterator>
+          <ForVariable name="$$context-item">
+            <ProbeIndexRangeValueIterator>
+              <SingletonIterator value="xs:QName(http://28.io/collections,db28,question-id-idx)"/>
+              <ForVarIterator varname="id"/>
+              <ForVarIterator varname="id"/>
+              <SingletonIterator value="xs:boolean(true)"/>
+              <SingletonIterator value="xs:boolean(true)"/>
+              <SingletonIterator value="xs:boolean(true)"/>
+              <SingletonIterator value="xs:boolean(true)"/>
+            </ProbeIndexRangeValueIterator>
+          </ForVariable>
+          <ReturnClause>
+            <JSONObjectValueIterator>
+              <ForVarIterator varname="$$context-item"/>
+              <SingletonIterator value="xs:string(title)"/>
+            </JSONObjectValueIterator>
+          </ReturnClause>
+        </flwor::FLWORIterator>
+      </JSONBoxIterator>
+      <ForVarIterator varname="count"/>
+    </JSONDirectObjectIterator>
+  </flwor::TupleStreamIterator>
+</SequentialIterator>
+

=== added file 'test/rbkt/ExpQueryResults/zorba/index/match_veq_09.xml.res'
=== added file 'test/rbkt/Queries/zorba/index/match_veq_09.xq'
--- test/rbkt/Queries/zorba/index/match_veq_09.xq	1970-01-01 00:00:00 +0000
+++ test/rbkt/Queries/zorba/index/match_veq_09.xq	2013-02-21 22:39:36 +0000
@@ -0,0 +1,31 @@
+
+
+import module namespace db28 = 
+"http://28.io/collections"; at "match_veq_09.xqlib";
+
+import module namespace dml = 
+"http://www.zorba-xquery.com/modules/store/static/collections/dml";;
+
+import module namespace ddl = 
+"http://www.zorba-xquery.com/modules/store/static/collections/ddl";;
+
+import module namespace iddl = 
+"http://www.zorba-xquery.com/modules/store/static/indexes/ddl";;
+
+
+ddl:create(xs:QName("db28:faqs"));
+
+ddl:create(xs:QName("db28:answers"));
+
+iddl:create(xs:QName("db28:question-id-idx"));
+
+
+for $answers in dml:collection(xs:QName("db28:answers"))
+let $id := $answers("question_id")
+group by $id
+let $count := count($answers)
+order by $count descending
+return {
+ "title": dml:collection(xs:QName("db28:faqs"))[$id eq .("question_id")]("title"),
+ "answer_count": $count
+}

=== added file 'test/rbkt/Queries/zorba/index/match_veq_09.xqlib'
--- test/rbkt/Queries/zorba/index/match_veq_09.xqlib	1970-01-01 00:00:00 +0000
+++ test/rbkt/Queries/zorba/index/match_veq_09.xqlib	2013-02-21 22:39:36 +0000
@@ -0,0 +1,15 @@
+
+module namespace db28 = "http://28.io/collections";;
+
+import module namespace db = "http://www.zorba-xquery.com/modules/store/static/collections/dml";;
+
+declare namespace an = "http://www.zorba-xquery.com/annotations";;
+
+declare collection db28:answers as object()*;
+
+declare collection db28:faqs as object()*;
+
+declare %an:value-range index db28:question-id-idx
+on nodes db:collection(xs:QName("db28:faqs"))
+by .("question_id") as xs:integer;
+

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