Do not allow ALTER TABLE RENAME COLUMN on a virtual table.

FossilOrigin-Name: f6d6b472713c21deace3fd52c0b0b6901d758af043c238f004fabe52b01f730c

manifest

@@ -1,5 +1,5 @@
-C Improved\serror\smessages\swhen\san\sALTER\sTABLE\sRENAME\sCOLUMN\sfails\sdue\sto\sa\nduplicate\scolumn\sname.
-D 2018-08-14T19:27:51.931
+C Do\snot\sallow\sALTER\sTABLE\sRENAME\sCOLUMN\son\sa\svirtual\stable.
+D 2018-08-14T20:38:18.441
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
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@@ -432,7 +432,7 @@ F spec.template 86a4a43b99ebb3e75e6b9a735d5fd293a24e90ca
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 F sqlite3.pc.in 48fed132e7cb71ab676105d2a4dc77127d8c1f3a
-F src/alter.c ec59506ca095be71dbb7f1ad3566a41b38cf6d567c68deb107d8797a940466e9
+F src/alter.c b3f6b775437e34bec4d420fdcccf5ca0452d289ae73fd0d20008eac26032d66a
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@@ -1756,7 +1756,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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manifest.uuid

@@ -1 +1 @@
-37d11b8e8224a8b241ff57b9c4b9499db39dde4ddcb56ff8b03a3d08091a4c11
+f6d6b472713c21deace3fd52c0b0b6901d758af043c238f004fabe52b01f730c

src/alter.c

@@ -817,6 +817,13 @@ void sqlite3AlterRenameColumn(
   /* Cannot alter a system table */
   if( SQLITE_OK!=isSystemTable(pParse, pTab->zName) ) goto exit_rename_column;
 
+  /* Cannot rename columns of a virtual table */
+  if( IsVirtual(pTab) ){
+    sqlite3ErrorMsg(pParse, "cannot rename columns in a virtual table (%s)",
+                    pTab->zName);
+    goto exit_rename_column;
+  }
+
   /* Which schema holds the table to be altered */  
   iSchema = sqlite3SchemaToIndex(db, pTab->pSchema);
   assert( iSchema>=0 );