Matthias Brantner has proposed merging 
lp:~zorba-coders/zorba/feature-no-mat-setVariable into lp:zorba.

Commit message:
non-materializing query chaining using DynamicContext::setVariable

Requested reviews:
  Matthias Brantner (matthias-brantner)

For more details, see:
https://code.launchpad.net/~zorba-coders/zorba/feature-no-mat-setVariable/+merge/179831

non-materializing query chaining using DynamicContext::setVariable
-- 
https://code.launchpad.net/~zorba-coders/zorba/feature-no-mat-setVariable/+merge/179831
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=== modified file 'include/zorba/dynamic_context.h'
--- include/zorba/dynamic_context.h	2013-08-01 07:58:48 +0000
+++ include/zorba/dynamic_context.h	2013-08-13 00:13:40 +0000
@@ -102,13 +102,16 @@
    * @param aQName the QName that identifies the external variable.
    * @param aIterator the Iterator producing the sequence that is assigned
    *        to the variable.
+   * @param aMaterialize determines whether the result of the iterator should
+   *        be materialized before binding it to the variable.
    * @return true if the variable has been set successfully, false otherwise.
    * @throw ZorbaException if an error occured (e.g. the given Iterator is not valid).
    */
   virtual bool
   setVariable( 
       const String& aQName,
-      const Iterator_t& aIterator) = 0;
+      const Iterator_t& aIterator,
+      bool aMaterialize = true) = 0;
 
   /** 
    * \brief Defines the external variable identified by an expanded QName and
@@ -121,6 +124,8 @@
    * @param aLocalname the local name of the variable's expanded QName
    * @param aIterator the Iterator producing the sequence that is assigned
    *        to the variable.
+   * @param aMaterialize determines whether the result of the iterator should
+   *        be materialized before binding it to the variable.
    * @return true if the variable has been set successfully, false otherwise.
    * @throw ZorbaException if an error occured (e.g. the given Iterator is not valid).
    */
@@ -128,7 +133,8 @@
   setVariable( 
       const String& aNamespace,
       const String& aLocalname,
-      const Iterator_t& aIterator) = 0;
+      const Iterator_t& aIterator,
+      bool aMaterialize = true) = 0;
 
   /** \brief Returns the current value of an external
    * variable. Exactly one of the two return values (aItem or

=== modified file 'src/api/dynamiccontextimpl.cpp'
--- src/api/dynamiccontextimpl.cpp	2013-08-01 17:23:58 +0000
+++ src/api/dynamiccontextimpl.cpp	2013-08-13 00:13:40 +0000
@@ -232,7 +232,8 @@
 ********************************************************************************/
 bool DynamicContextImpl::setVariable(
     const String& inVarName,
-    const Iterator_t& inValue)
+    const Iterator_t& inValue,
+    bool aMaterialize)
 {
   ZORBA_DCTX_TRY
   {
@@ -267,7 +268,7 @@
 
     ulong varId = var->getId();
 
-    theCtx->add_variable(varId, value);
+    theCtx->add_variable(varId, value, aMaterialize);
 
     return true;
   }
@@ -282,7 +283,8 @@
 bool DynamicContextImpl::setVariable(
     const String& inNamespace,
     const String& inLocalname,
-    const Iterator_t& inValue)
+    const Iterator_t& inValue,
+    bool aMaterialize)
 {
   ZORBA_DCTX_TRY
   {
@@ -319,7 +321,7 @@
 
     ulong varId = var->getId();
 
-    theCtx->add_variable(varId, value);
+    theCtx->add_variable(varId, value, aMaterialize);
 
     return true;
   }

=== modified file 'src/api/dynamiccontextimpl.h'
--- src/api/dynamiccontextimpl.h	2013-08-01 07:57:57 +0000
+++ src/api/dynamiccontextimpl.h	2013-08-13 00:13:40 +0000
@@ -107,13 +107,15 @@
   virtual bool
   setVariable(
       const String& inVarName,
-      const Iterator_t& inValue);
+      const Iterator_t& inValue,
+      bool aMaterialize = true);
 
   virtual bool
   setVariable(
       const String& inNamespace,
       const String& inLocalname,
-      const Iterator_t& inValue);
+      const Iterator_t& inValue,
+      bool aMaterialize = true);
 
   virtual bool
   setContextItem(const Item& inValue);

=== modified file 'src/context/dynamic_context.cpp'
--- src/context/dynamic_context.cpp	2013-08-02 18:36:02 +0000
+++ src/context/dynamic_context.cpp	2013-08-13 00:13:40 +0000
@@ -405,10 +405,13 @@
 /*******************************************************************************
 
 ********************************************************************************/
-void dynamic_context::add_variable(ulong varid, store::Iterator_t& value)
+void dynamic_context::add_variable(
+    ulong varid,
+    store::Iterator_t& value,
+    bool materialize)
 {
   declare_variable(varid, false);
-  set_variable(varid, NULL, QueryLoc::null, value);
+  set_variable(varid, NULL, QueryLoc::null, value, materialize);
 }
 
 
@@ -446,7 +449,8 @@
     ulong varid,
     const store::Item_t& varname,
     const QueryLoc& loc,
-    store::Iterator_t& valueIter)
+    store::Iterator_t& valueIter,
+    bool materialize)
 {
   if (varid >= theVarValues.size() ||
       theVarValues[varid].theState == VarValue::undeclared)
@@ -461,7 +465,7 @@
   // the variable itself, and the current value of the variable is overwriten
   // here by this temp sequence. TODO: use lazy eval if we know the the
   // assignment expression does not reference the variable itself.
-  store::TempSeq_t seq = GENV_STORE.createTempSeq(valueIter, false); // no lazy eval
+  store::TempSeq_t seq = GENV_STORE.createTempSeq(valueIter, !materialize); // no lazy eval
 
   valueIter->close();
 

=== modified file 'src/context/dynamic_context.h'
--- src/context/dynamic_context.h	2013-06-11 23:38:49 +0000
+++ src/context/dynamic_context.h	2013-08-13 00:13:40 +0000
@@ -204,7 +204,7 @@
 
   void add_variable(ulong varid, store::Item_t& value);
 
-  void add_variable(ulong varid, store::Iterator_t& value);
+  void add_variable(ulong varid, store::Iterator_t& value, bool materialize = true);
 
   void declare_variable(ulong varid, bool external);
 
@@ -218,7 +218,8 @@
       ulong varid,
       const store::Item_t& varname,
       const QueryLoc& loc,
-      store::Iterator_t& value);
+      store::Iterator_t& value,
+      bool materialize = true);
 
   void unset_variable(
       ulong varid,

=== modified file 'test/unit/CMakeLists.txt'
--- test/unit/CMakeLists.txt	2013-05-31 23:44:41 +0000
+++ test/unit/CMakeLists.txt	2013-08-13 00:13:40 +0000
@@ -97,6 +97,7 @@
   xmldatamanager.cpp
   staticcollectionmanager.cpp
   test_static_context.cpp
+  dynamic_context.cpp
 )
 
 # multithread_simple.cpp

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