- Try to fix a uninitialised valgrind warning

modified:
  storage/connect/ha_connect.cc
  storage/connect/ha_connect.h
  storage/connect/mycat.cc

- Fix a regression error on XML libdoc wrong Nlist freing

modified:
  storage/connect/domdoc.h
  storage/connect/libdoc.cpp
  storage/connect/libdoc.h
  storage/connect/plgxml.h
  storage/connect/tabxml.cpp

storage/connect/domdoc.h

@@ -35,6 +35,7 @@ class DOMDOC : public XMLDOCUMENT {
   // Properties
   virtual short  GetDocType(void) {return TYPE_FB_XML;}
   virtual void  *GetDocPtr(void) {return Docp;}
+  virtual void   SetNofree(bool b) {}   // Only libxml2
 
   // Methods
   virtual bool    Initialize(PGLOBAL g);

storage/connect/ha_connect.cc

@@ -851,7 +851,7 @@ PFOS ha_connect::GetFieldOptionStruct(Field *fdp)
 /****************************************************************************/
 /*  Returns the column description structure used to make the column.       */
 /****************************************************************************/
-void *ha_connect::GetColumnOption(void *field, PCOLINFO pcf)
+void *ha_connect::GetColumnOption(PGLOBAL g, void *field, PCOLINFO pcf)
 {
   const char *cp;
   ha_field_option_struct *fop;
@@ -983,9 +983,14 @@ void *ha_connect::GetColumnOption(void *field, PCOLINFO pcf)
 
   pcf->Key= 0;   // Not used when called from MySQL
 
-  // To make valgring happy
-  pcf->Remark= (fp->comment.str && fp->comment.length) ?
-                fp->comment.str : NULL;
+  // Get the comment if any
+  if (fp->comment.str && fp->comment.length) {
+    pcf->Remark= (char*)PlugSubAlloc(g, NULL, fp->comment.length + 1);
+    memcpy(pcf->Remark, fp->comment.str, fp->comment.length);
+    pcf->Remark[fp->comment.length] = 0;
+  } else
+    pcf->Remark= NULL;
+
   return fldp;
 } // end of GetColumnOption
 

storage/connect/ha_connect.h

@@ -154,7 +154,7 @@ class ha_connect: public handler
   int      GetIntegerOption(char *opname);
   bool     SetIntegerOption(char *opname, int n);
   PFOS     GetFieldOptionStruct(Field *fp);
-  void    *GetColumnOption(void *field, PCOLINFO pcf);
+  void    *GetColumnOption(PGLOBAL g, void *field, PCOLINFO pcf);
   PIXDEF   GetIndexInfo(void);
   const char *GetDBName(const char *name);
   const char *GetTableName(void);

storage/connect/libdoc.cpp

@@ -146,6 +146,8 @@ LIBXMLDOC::LIBXMLDOC(char *nsl, char *nsdf, char *enc, PFBLOCK fp)
   Nlist = NULL;
   Ctxp = NULL;
   Xop = NULL;
+  Buf = NULL;
+  Nofreelist = false;
   } // end of LIBXMLDOC constructor
 
 /******************************************************************/
@@ -347,6 +349,9 @@ void LIBXMLDOC::CloseDoc(PGLOBAL g, PFBLOCK xp)
     htrc("CloseDoc: xp=%p count=%d\n", xp, (xp) ? xp->Count : 0);
 
   if (xp && xp->Count == 1) {
+    if (Nlist)
+      xmlXPathFreeNodeSet(Nlist);
+
     if (Xop)
       xmlXPathFreeObject(Xop);
 
@@ -410,8 +415,13 @@ xmlNodeSetPtr LIBXMLDOC::GetNodeList(PGLOBAL g, xmlNodePtr np, char *xp)
     if (trace)
       htrc("Calling xmlXPathFreeNodeSetList Xop=%p\n", Xop);
 
-    xmlXPathFreeObject(Xop);
-//  xmlXPathFreeNodeSetList(Xop);         // Caused memory leak
+    if (Nofreelist) {
+      // Making Nlist that must not be freed yet
+      xmlXPathFreeNodeSetList(Xop);       // Caused memory leak
+      Nofreelist = false;
+    } else
+      xmlXPathFreeObject(Xop);            // Caused node not found
+
   } // endif Ctxp
 
   // Set the context to the calling node

storage/connect/libdoc.h

@@ -37,6 +37,7 @@ class LIBXMLDOC : public XMLDOCUMENT {
   // Properties
   virtual short  GetDocType(void) {return TYPE_FB_XML2;}
   virtual void  *GetDocPtr(void) {return Docp;}
+  virtual void   SetNofree(bool b) {Nofreelist = b;}
 
   // Methods
   virtual bool    Initialize(PGLOBAL g);
@@ -64,6 +65,7 @@ class LIBXMLDOC : public XMLDOCUMENT {
   xmlXPathContextPtr Ctxp;
   xmlXPathObjectPtr  Xop;
   char              *Buf;                  // Temporary
+  bool               Nofreelist;
 }; // end of class LIBXMLDOC
 
 /******************************************************************/

storage/connect/mycat.cc

@@ -470,7 +470,7 @@ int MYCAT::GetColCatInfo(PGLOBAL g, PTABDEF defp)
 			} // endswitch tc
 
 		do {
-			field= Hc->GetColumnOption(field, pcf);
+			field= Hc->GetColumnOption(g, field, pcf);
 			} while (field && (*pcf->Name =='*' /*|| pcf->Flags & U_VIRTUAL*/));
 
 		if (tc == TAB_DBF && pcf->Type == TYPE_DATE && !pcf->Datefmt) {

storage/connect/plgxml.h

@@ -69,6 +69,7 @@ class XMLDOCUMENT : public BLOCK {
   // Properties
   virtual short   GetDocType(void) = 0;
   virtual void   *GetDocPtr(void) = 0;
+  virtual void    SetNofree(bool b) = 0;
 
   // Methods
   virtual bool    Initialize(PGLOBAL) = 0;

storage/connect/tabxml.cpp

@@ -547,6 +547,7 @@ bool TDBXML::Initialize(PGLOBAL g)
     else
       Nlist = TabNode->GetChildElements(g);
 
+    Docp->SetNofree(true);       // For libxml2
 #if defined(WIN32)
   } catch(_com_error e) {
     // We come here if a DOM command threw an error