- Add routine to test index equality

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

storage/connect/ha_connect.cc

@@ -2988,6 +2988,30 @@ bool ha_connect::check_privileges(THD *thd, PTOS options)
     return true;
 }
 
+// Check that two indexes are equivalent 
+bool ha_connect::IsSameIndex(PIXDEF xp1, PIXDEF xp2)
+{
+  bool   b= true;
+  PKPDEF kp1, kp2;
+
+  if (stricmp(xp1->Name, xp2->Name))
+    b= false;
+  else if (xp1->Nparts  != xp2->Nparts  ||
+           xp1->MaxSame != xp2->MaxSame ||
+           xp1->Unique  != xp2->Unique)
+    b= false;
+  else for (kp1= xp1->ToKeyParts, kp2= xp2->ToKeyParts;
+            b && (kp1 || kp2);
+            kp1= kp1->Next, kp2= kp2->Next)
+    if (!kp1 || !kp2)
+      b= false;
+    else if (stricmp(kp1->Name, kp2->Name))
+      b= false;
+    else if (kp1->Klen != kp2->Klen)
+      b= false;
+
+  return b;
+} // end of IsSameIndex
 
 /**
   @brief
@@ -3074,7 +3098,7 @@ int ha_connect::external_lock(THD *thd, int lock_type)
       
           for (xp2= oldpix; xp2; xp2= xp) {
             for (xp1= newpix; xp1; xp1= xp1->Next)
-              if (!stricmp(xp1->Name, xp2->Name))
+              if (IsSameIndex(xp1, xp2))
                 break;        // Index not to drop
       
             xp= xp2->GetNext();
@@ -3107,7 +3131,7 @@ int ha_connect::external_lock(THD *thd, int lock_type)
 
         for (xp1= newpix; xp1; xp1= xp) {
           for (xp2= oldpix; xp2; xp2= xp2->Next)
-            if (!stricmp(xp1->Name, xp2->Name))
+            if (IsSameIndex(xp1, xp2))
               break;        // Index already made
 
           xp= xp1->Next;

storage/connect/ha_connect.h

@@ -108,7 +108,8 @@ class ha_connect: public handler
   int      GetColNameLen(Field *fp);
   char    *GetColName(Field *fp);
   void     AddColName(char *cp, Field *fp);
-  TABLE    *GetTable(void) {return table;}
+  TABLE   *GetTable(void) {return table;}
+  bool     IsSameIndex(PIXDEF xp1, PIXDEF xp2);
 
   PCONNECT GetUser(THD *thd);
   PGLOBAL  GetPlug(THD *thd);

storage/connect/xindex.h

@@ -147,6 +147,7 @@ class DllExport KPARTDEF : public BLOCK { /* Index Key Part desc block */
   friend class XINDEX;
   friend class PLUGCAT;
   friend class DOSDEF;
+  friend class ha_connect;
   friend int PlgMakeIndex(PGLOBAL g, PSZ name, PIXDEF pxdf, bool add);
  public:
   KPARTDEF(PSZ name, int n);       // Constructor