Remove warning on Linux

  modified:   storage/connect/filamzip.cpp

Avoid calling the wrong AddValue (Windows compiler error ???)
  modified:   storage/connect/json.h

Fix looping bug in JARRAY::AddValue for arrays having one value.
Fix potential crash in JVALUE::SetValue
  modified:   storage/connect/json.cpp

Many changes to fix bugs, enhance memory handling and modify Jpath.
In JSNX some functions have been re-written or added to handle new Jpath.
BMX was re-defined to avoid a different size between Windows an Linux.
Jbin memory was fixed to use the proper memory when adding values.
Default pretty value is now 0 instead of 2.
Filename is stored in BSON when IsJson == 2.
BSON size is added to memlen in CalcLen when applicable.
The order or parameter was switch in Json_Object_Grp.
File name argument must be a constant (temporary?)
Json_Set_Item now returns file name when applicable.
  modified:   storage/connect/jsonudf.cpp
  modified:   storage/connect/jsonudf.h

Include "mycat.h"
  modified:   storage/connect/mycat.cc

Udf_json test revisited and fixed for Linux
  modified:   storage/connect/mysql-test/connect/r/json_udf.result
  modified:   storage/connect/mysql-test/connect/t/json_udf.inc
  modified:   storage/connect/mysql-test/connect/t/json_udf.test
  modified:   storage/connect/mysql-test/connect/t/json_udf2.inc

storage/connect/filamzip.cpp

@@ -1404,8 +1404,13 @@ void ZLBFAM::Rewind(void)
   // We must be positioned after the header block
   if (CurBlk >= 0) {   // Nothing to do if no block read yet
     if (!Optimized) {  // If optimized, fseek will be done in ReadBuffer
+			size_t st;
+
       rewind(Stream);
-      (void) fread(Zlenp, sizeof(int), 1, Stream);
+
+			if (!(st = fread(Zlenp, sizeof(int), 1, Stream)) && trace)
+				htrc("fread error %d in Rewind", errno);
+
       fseek(Stream, *Zlenp + sizeof(int), SEEK_SET);
       OldBlk = -1;
       } // endif Optimized

storage/connect/json.cpp

@@ -1096,10 +1096,12 @@ PJVAL JARRAY::AddValue(PGLOBAL g, PJVAL jvp, int *x)
 			Last = jvp;
 
 	} else {
-		if (Last)
-			Last->Next = jvp;
-		else
+		if (!First)
 			First = jvp;
+		else if (Last == First)
+			First->Next = Last = jvp;
+		else
+			Last->Next = jvp;
 
 		Last = jvp;
 	} // endif x
@@ -1284,7 +1286,7 @@ PSZ JVALUE::GetText(PGLOBAL g, PSZ text)
 
 void JVALUE::SetValue(PJSON jsp)
 { 
-	if (jsp->GetType() == TYPE_JVAL) {
+	if (jsp && jsp->GetType() == TYPE_JVAL) {
 		Jsp = jsp->GetJsp();
 		Value = jsp->GetValue();
 	} else {

storage/connect/json.h

@@ -149,7 +149,7 @@ class JSON : public BLOCK {
   virtual JTYP   GetType(void) {return TYPE_JSON;}
   virtual JTYP   GetValType(void) {X return TYPE_JSON;}
   virtual void   InitArray(PGLOBAL g) {X}
-  virtual PJVAL  AddValue(PGLOBAL g, PJVAL jvp = NULL, int *x = NULL) {X return NULL;}
+//virtual PJVAL  AddValue(PGLOBAL g, PJVAL jvp = NULL, int *x = NULL) {X return NULL;}
   virtual PJPR   AddPair(PGLOBAL g, PSZ key) {X return NULL;}
 	virtual PJAR   GetKeyList(PGLOBAL g) {X return NULL;}
 	virtual PJVAL  GetValue(const char *key) {X return NULL;}
@@ -223,7 +223,7 @@ class JARRAY : public JSON {
   virtual void  Clear(void) {First = Last = NULL; Size = 0;}
   virtual JTYP  GetType(void) {return TYPE_JAR;}
   virtual PJAR  GetArray(void) {return this;}
-  virtual PJVAL AddValue(PGLOBAL g, PJVAL jvp = NULL, int *x = NULL);
+          PJVAL AddValue(PGLOBAL g, PJVAL jvp = NULL, int *x = NULL);
   virtual void  InitArray(PGLOBAL g);
   virtual PJVAL GetValue(int i);
 	virtual bool  Merge(PGLOBAL g, PJSON jsp);