From: drh <>
Date: Mon, 2 Aug 2021 18:03:43 +0000 (+0000)
Subject: Refactor field names in the Column object, zCnName and zCnColl, to make them
X-Git-Tag: version-3.37.0~301
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=cf9d36d1b3a84fb68d2e13acb790c449bff51c15;p=thirdparty%2Fsqlite.git

Refactor field names in the Column object, zCnName and zCnColl, to make them
unique and thus easier to find amid all the other code.

FossilOrigin-Name: 8b781dcaf68e0cf12a844708c82eee00193e340195cbca915d077e4846983bf3
---

diff --git a/manifest b/manifest
index 1a7d194773..837fef528d 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Refactor\sthe\sTable\sobject\sto\sreduce\sits\smemory\sfootprint.
-D 2021-08-02T16:41:57.123
+C Refactor\sfield\snames\sin\sthe\sColumn\sobject,\szCnName\sand\szCnColl,\sto\smake\sthem\nunique\sand\sthus\seasier\sto\sfind\samid\sall\sthe\sother\scode.
+D 2021-08-02T18:03:43.555
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -478,17 +478,17 @@ F spec.template 86a4a43b99ebb3e75e6b9a735d5fd293a24e90ca
 F sqlite.pc.in 42b7bf0d02e08b9e77734a47798d1a55a9e0716b
 F sqlite3.1 fc7ad8990fc8409983309bb80de8c811a7506786
 F sqlite3.pc.in 48fed132e7cb71ab676105d2a4dc77127d8c1f3a
-F src/alter.c e73e2dad9338274b53c04ba5fdcb8653fef898e4709b65d7f6f3197573e4d992
-F src/analyze.c 01c6c6765cb4d40b473b71d85535093730770bb186f2f473abac25f07fcdee5c
+F src/alter.c 3ce23a6f06a789de05e0bfd581f9dd6367a50135def2688cfd0af78675cae676
+F src/analyze.c abbaaf7dca79d1c31c713500324fc0b55bf3eeac5b7b07001452a3d0f210de4f
 F src/attach.c a514e81758ba7b3a3a0501faf70af6cfc509de8810235db726cfc9f25165e929
-F src/auth.c 08954fdc4cc2da5264ba5b75cfd90b67a6fc7d1710a02ccf917c38eadec77853
+F src/auth.c f4fa91b6a90bbc8e0d0f738aa284551739c9543a367071f55574681e0f24f8cf
 F src/backup.c 3014889fa06e20e6adfa0d07b60097eec1f6e5b06671625f476a714d2356513d
 F src/bitvec.c 17ea48eff8ba979f1f5b04cc484c7bb2be632f33
 F src/btmutex.c 8acc2f464ee76324bf13310df5692a262b801808984c1b79defb2503bbafadb6
 F src/btree.c e204a9c8fb4fe5dbb910a863ba487f4af9b5c501254ec4ccbfcdd6b1f65b7fb4
 F src/btree.h 74d64b8f28cfa4a894d14d4ed64fa432cd697b98b61708d4351482ae15913e22
 F src/btreeInt.h 7bc15a24a02662409ebcd6aeaa1065522d14b7fda71573a2b0568b458f514ae0
-F src/build.c d13fc40575b08422ddb44286537b0d3d80b03f063e0c3b6577d4bf84258f1f5e
+F src/build.c 8b1f2a80155a1e140030848fdc951ceb31c055212768d992d62d3bca1c588942
 F src/callback.c d0b853dd413255d2e337b34545e54d888ea02f20da5ad0e63585b389624c4a6c
 F src/complete.c a3634ab1e687055cd002e11b8f43eb75c17da23e
 F src/ctime.c 8159d5f706551861c18ec6c8f6bdf105e15ea00367f05d9ab65d31a1077facc1
@@ -496,19 +496,19 @@ F src/date.c e0632f335952b32401482d099321bbf12716b29d6e72836b53ae49683ebae4bf
 F src/dbpage.c 8a01e865bf8bc6d7b1844b4314443a6436c07c3efe1d488ed89e81719047833a
 F src/dbstat.c 3aa79fc3aed7ce906e4ea6c10e85d657299e304f6049861fe300053ac57de36c
 F src/delete.c b43f0f4db586acf0b4078e3982485c26fbec984674df513d5ade48a08a323c5a
-F src/expr.c 4e2878324f6be88a766f4e83bc3132106a9913f2bd029a4b92447626501996ce
+F src/expr.c 0d541b9f9ecddf9d6d310f31922006f03509d7264ef53ac39c391b82a62383f9
 F src/fault.c 460f3e55994363812d9d60844b2a6de88826e007
-F src/fkey.c bcd5006ce061ef7b331154d176a0869440b1049c67c14c92f0233a14a701f2cc
+F src/fkey.c 7713a4e87755afbe85d1cb3e3e36b6a9989dc24a210a4e99bf2af9a9ae2851c2
 F src/func.c c224240cbc97fa5e9c4fe9acb128716cb835ca045532bca6951b7c45b020c56c
 F src/global.c 5eba017ebbd887e2365e6e6e815e1619e41406b8946d17594e94116174787df5
 F src/hash.c 8d7dda241d0ebdafb6ffdeda3149a412d7df75102cecfc1021c98d6219823b19
 F src/hash.h 9d56a9079d523b648774c1784b74b89bd93fac7b365210157482e4319a468f38
 F src/hwtime.h cb1d7e3e1ed94b7aa6fde95ae2c2daccc3df826be26fc9ed7fd90d1750ae6144
 F src/in-operator.md 10cd8f4bcd225a32518407c2fb2484089112fd71
-F src/insert.c 167b286e3e289dbd1dad8f5a90858e9a6221bd83902985adf110e9db9fc2db67
+F src/insert.c c6419bc4b447f3d4cdb7b1167690baaea3b796a80cea48e7cf26da65487d430d
 F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
 F src/loadext.c 0aa9e7f08e168e3874cb54984408e3976dafdf5616d511952c425b5ac088ea3e
-F src/main.c 6921ce667627d0d38e67f8508d5903e074134386427688e6b4588bfe57ce06a4
+F src/main.c 2c17a667133d2d1666319cfef975a48aa640a3de0c57d68b362372a12ad5557b
 F src/malloc.c cbc93cdd429c4594912017d92ab656e2579aca64dbd1c6888551275bed46f25b
 F src/mem0.c 6a55ebe57c46ca1a7d98da93aaa07f99f1059645
 F src/mem1.c c12a42539b1ba105e3707d0e628ad70e611040d8f5e38cf942cee30c867083de
@@ -537,19 +537,19 @@ F src/parse.y 0ba0baec5de6921ec8ba8bbcf1018969144ef29d26112e17539d8fbb1662e3eb
 F src/pcache.c 385ff064bca69789d199a98e2169445dc16e4291fa807babd61d4890c3b34177
 F src/pcache.h 4f87acd914cef5016fae3030343540d75f5b85a1877eed1a2a19b9f284248586
 F src/pcache1.c 388304fd2d91c39591080b5e0f3c62cfba87db20370e7e0554062bfb29740e9f
-F src/pragma.c 4a510b24e5b2321fd6bb509cd0dc8003514cb574b872dd535f49870b84ee54b1
+F src/pragma.c af0f43789545622fd5377d71f6d4c0e7c9b9295a3f5d5b1242e4032d38ca12b5
 F src/pragma.h a11b4798f9c49f156f130e1f7041a9fcc9d316a64f3501b6013acdd2e4c6f549
 F src/prepare.c 0d53d20532aada295c1690792a125adbd6435f5ce703ff0adf1b9b3605238b67
 F src/printf.c 78fabb49b9ac9a12dd1c89d744abdc9b67fd3205e62967e158f78b965a29ec4b
 F src/random.c 097dc8b31b8fba5a9aca1697aeb9fd82078ec91be734c16bffda620ced7ab83c
-F src/resolve.c 047a822844cea769f6fdd8418a335dd4bcd8b75ab5e264f2506a0804f869b562
+F src/resolve.c 42b94d37a54200707a95566eff4f7e8a380e32d080016b699f23bd79a73a5028
 F src/rowset.c ba9515a922af32abe1f7d39406b9d35730ed65efab9443dc5702693b60854c92
-F src/select.c 2b25a79706c8a71e40f5fbc8705073c54f6a3d25f556dac9d6d91676026a0413
+F src/select.c 52041124629704feb24b1bc7dabf8ec03a0857c69d23f2dd0c33c9ed3d074adb
 F src/shell.c.in 24b99dae8818d1a234732d73f4d5b49f12b510bc62735a41c04e314fafae09e3
 F src/sqlite.h.in 43fcf0fe2af04081f420a906fc020bde1243851ba44b0aa567a27f94bf8c3145
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h e97f4e9b509408fea4c4e9bef5a41608dfac343b4d3c7a990dedde1e19af9510
-F src/sqliteInt.h 8601c620280dcb514e6e9dfb1fa7ee005ccc56c244ac82cb48a1045ed2e7003c
+F src/sqliteInt.h 6f02ceb8d6b8784faf7218bd58b59580837c9e95e54a5b34d48ae93504ba67ce
 F src/sqliteLimit.h d7323ffea5208c6af2734574bae933ca8ed2ab728083caa117c9738581a31657
 F src/status.c 4b8bc2a6905163a38b739854a35b826c737333fab5b1f8e03fa7eb9a4799c4c1
 F src/table.c 0f141b58a16de7e2fbe81c308379e7279f4c6b50eb08efeec5892794a0ba30d1
@@ -610,18 +610,18 @@ F src/test_wsd.c 41cadfd9d97fe8e3e4e44f61a4a8ccd6f7ca8fe9
 F src/threads.c 4ae07fa022a3dc7c5beb373cf744a85d3c5c6c3c
 F src/tokenize.c bae853ad129d1129c063de8630a3e99e306283bc40146f359b1bb91be2c08f1e
 F src/treeview.c 43f88d0fd19976a60aee6867959213b438593276f1e8179048df85f416a1ab19
-F src/trigger.c 43d76cf913e65a5d06ed0768d8ded7259a5d6e284641a18acb355a302792cd05
-F src/update.c 985a8a45b4ff86a0231fedd584e2bd87fd6fac5168286935195ad006d032d555
-F src/upsert.c df8f1727d62b5987c4fd302cd4d7c0c84ae57cd65683c5a34a740dfe24039235
+F src/trigger.c 3f612ce5f0858b6c23460a3c799d01f408b49b0b29d931d8b8e6fc224a8667de
+F src/update.c 69c4c10bc6873a80c0a77cb578f9fc60ee90003d03f9530bc3370fa24615772d
+F src/upsert.c 8789047a8f0a601ea42fa0256d1ba3190c13746b6ba940fe2d25643a7e991937
 F src/utf.c ee39565f0843775cc2c81135751ddd93eceb91a673ea2c57f61c76f288b041a0
-F src/util.c 6ca9cf268dfaf2393866990788c0797240e20e7ba7e3a22cd076e6a3c7b1a132
+F src/util.c b18a971c8936e9299fecc00474269a11135989d6fe9bd91b1e52137d6f27bd8c
 F src/vacuum.c 454973a59fb20bb982efc2df568a098616db6328a0491b6e84e2e07f7333db45
 F src/vdbe.c b73a5ec9940185eb001ff8cff2cfd429bb438c7e89f2885e0bfdb56c3ff13386
 F src/vdbe.h 25dabb25c7e157b84e59260cfb5b466c3ac103ede9f36f4db371332c47601abe
 F src/vdbeInt.h 38206c8dd6b60ff03d9fd4f626b1b4fd0eef7cdc44f2fc2c1973b0f932a3f26b
 F src/vdbeapi.c aa5aaf2c37676b83af5724c6cd8207a3064ed46a217fd180957f75ac84f7a2a5
 F src/vdbeaux.c 202dbaf7d1570cd53678f6b0bcad7b0642e88bc5d77abc1d5b8b9a202a6a19fd
-F src/vdbeblob.c 2f3c2ada0429045c54e5ebd48f45281c52addf4648e0d234a2718dbdeab01c80
+F src/vdbeblob.c 60a7694760e35b2bba166cf49eb6a1eb0b31581102b49de78008ca3032406065
 F src/vdbemem.c 53881aa0a7845922a075b3f375695588618098871a7a4120af4c297b80fa3e64
 F src/vdbesort.c cd5130f683706c1a43e165a74187745fb3351cb56052cf9dc91de820634bbde2
 F src/vdbetrace.c 666c6fd9f1b62be6999e072a45b913e3c2c3518bc60dfd4d54fe304130acb724
@@ -631,9 +631,9 @@ F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
 F src/wal.c 2be08331d798237ad5d7ae0b252700ffb2b63189cb18d993496d009a93e2f81c
 F src/wal.h c3aa7825bfa2fe0d85bef2db94655f99870a285778baa36307c0a16da32b226a
 F src/walker.c 7342becedf3f8a26f9817f08436bdf8b56ad69af83705f6b9320a0ad3092c2ac
-F src/where.c 6e27c9f9438ddbb8aebbb83d24574a75398942b5e73b3f8cc572a39dc00f7482
+F src/where.c 99b6e13664a7bd9a553c554978d0e253066995dade621f44cffa8928c8b493b5
 F src/whereInt.h 9248161dd004f625ce5d3841ca9b99fed3fc8d61522cf76340fc5217dbe1375b
-F src/wherecode.c 9f1f65d11437b25cd0a1497a170514c785f19ce6ad9d3e6fc73719cb5a49012f
+F src/wherecode.c ef36790a797fa679f58dbd51930e3ee7ef7cb6c906ae412032e4d319a36a2eef
 F src/whereexpr.c 3a9144a9d52e110efdc012a73b1574e7b2b4df4bf98949387cb620295eba0975
 F src/window.c 420167512050a0dfc0f0115b9f0c7d299da9759c9bb2ae83a61fb8d730a5707f
 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
@@ -1920,7 +1920,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 8646547e54211d44c415663c33775c4268550f8332949c4731a4bb6ec9cc663a
-R 8143bc84e57e339634d6338dda56d190
+P bbb6759bcf6e01d36dfc787a82a610d359f50aaeac8104b73883a84906d54e1f
+R 7046be8b76bab8142bfe76e50eb88e2a
 U drh
-Z 0d31e4d81e774d8d4cc71b3c0a3d1311
+Z 5e85f685bd644cac3700fa74d443a453
diff --git a/manifest.uuid b/manifest.uuid
index aecc9c1e1c..2028f8b686 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-bbb6759bcf6e01d36dfc787a82a610d359f50aaeac8104b73883a84906d54e1f
\ No newline at end of file
+8b781dcaf68e0cf12a844708c82eee00193e340195cbca915d077e4846983bf3
\ No newline at end of file
diff --git a/src/alter.c b/src/alter.c
index 75220a1de3..0ca68c04f5 100644
--- a/src/alter.c
+++ b/src/alter.c
@@ -537,9 +537,9 @@ void sqlite3AlterBeginAddColumn(Parse *pParse, SrcList *pSrc){
   memcpy(pNew->aCol, pTab->aCol, sizeof(Column)*pNew->nCol);
   for(i=0; i<pNew->nCol; i++){
     Column *pCol = &pNew->aCol[i];
-    pCol->zName = sqlite3DbStrDup(db, pCol->zName);
-    pCol->hName = sqlite3StrIHash(pCol->zName);
-    pCol->zColl = 0;
+    pCol->zCnName = sqlite3DbStrDup(db, pCol->zCnName);
+    pCol->hName = sqlite3StrIHash(pCol->zCnName);
+    pCol->zCnColl = 0;
   }
   assert( !IsVirtual(pNew) );
   pNew->u.tab.pDfltList = sqlite3ExprListDup(db, pTab->u.tab.pDfltList, 0);
@@ -631,7 +631,7 @@ void sqlite3AlterRenameColumn(
   zOld = sqlite3NameFromToken(db, pOld);
   if( !zOld ) goto exit_rename_column;
   for(iCol=0; iCol<pTab->nCol; iCol++){
-    if( 0==sqlite3StrICmp(pTab->aCol[iCol].zName, zOld) ) break;
+    if( 0==sqlite3StrICmp(pTab->aCol[iCol].zCnName, zOld) ) break;
   }
   if( iCol==pTab->nCol ){
     sqlite3ErrorMsg(pParse, "no such column: \"%s\"", zOld);
@@ -1477,7 +1477,7 @@ static void renameColumnFunc(
     sqlite3BtreeLeaveAll(db);
     return;
   }
-  zOld = pTab->aCol[iCol].zName;
+  zOld = pTab->aCol[iCol].zCnName;
   memset(&sCtx, 0, sizeof(sCtx));
   sCtx.iCol = ((iCol==pTab->iPKey) ? -1 : iCol);
 
@@ -1514,7 +1514,7 @@ static void renameColumnFunc(
       if( bFKOnly==0 ){
         if( iCol<sParse.pNewTable->nCol ){
           renameTokenFind(
-              &sParse, &sCtx, (void*)sParse.pNewTable->aCol[iCol].zName
+              &sParse, &sCtx, (void*)sParse.pNewTable->aCol[iCol].zCnName
           );
         }
         if( sCtx.iCol<0 ){
@@ -2041,10 +2041,10 @@ static void dropColumnFunc(
     goto drop_column_done;
   }
 
-  pCol = renameTokenFind(&sParse, 0, (void*)pTab->aCol[iCol].zName);
+  pCol = renameTokenFind(&sParse, 0, (void*)pTab->aCol[iCol].zCnName);
   if( iCol<pTab->nCol-1 ){
     RenameToken *pEnd;
-    pEnd = renameTokenFind(&sParse, 0, (void*)pTab->aCol[iCol+1].zName);
+    pEnd = renameTokenFind(&sParse, 0, (void*)pTab->aCol[iCol+1].zCnName);
     zEnd = (const char*)pEnd->t.z;
   }else{
     assert( !IsVirtual(pTab) );
diff --git a/src/analyze.c b/src/analyze.c
index dc77220a53..41b993fb3f 100644
--- a/src/analyze.c
+++ b/src/analyze.c
@@ -968,7 +968,7 @@ static void analyzeVdbeCommentIndexWithColumnName(
   }else if( i==XN_EXPR ){
     VdbeComment((v,"%s.expr(%d)",pIdx->zName, k));
   }else{
-    VdbeComment((v,"%s.%s", pIdx->zName, pIdx->pTable->aCol[i].zName));
+    VdbeComment((v,"%s.%s", pIdx->zName, pIdx->pTable->aCol[i].zCnName));
   }
 }
 #else
diff --git a/src/auth.c b/src/auth.c
index 33420f5839..3a4f73a234 100644
--- a/src/auth.c
+++ b/src/auth.c
@@ -175,10 +175,10 @@ void sqlite3AuthRead(
 
   if( iCol>=0 ){
     assert( iCol<pTab->nCol );
-    zCol = pTab->aCol[iCol].zName;
+    zCol = pTab->aCol[iCol].zCnName;
   }else if( pTab->iPKey>=0 ){
     assert( pTab->iPKey<pTab->nCol );
-    zCol = pTab->aCol[pTab->iPKey].zName;
+    zCol = pTab->aCol[pTab->iPKey].zCnName;
   }else{
     zCol = "ROWID";
   }
diff --git a/src/build.c b/src/build.c
index 09222acf81..10a15189b0 100644
--- a/src/build.c
+++ b/src/build.c
@@ -716,9 +716,9 @@ void sqlite3DeleteColumnNames(sqlite3 *db, Table *pTable){
   assert( pTable!=0 );
   if( (pCol = pTable->aCol)!=0 ){
     for(i=0; i<pTable->nCol; i++, pCol++){
-      assert( pCol->zName==0 || pCol->hName==sqlite3StrIHash(pCol->zName) );
-      sqlite3DbFree(db, pCol->zName);
-      sqlite3DbFree(db, pCol->zColl);
+      assert( pCol->zCnName==0 || pCol->hName==sqlite3StrIHash(pCol->zCnName) );
+      sqlite3DbFree(db, pCol->zCnName);
+      sqlite3DbFree(db, pCol->zCnColl);
     }
     sqlite3DbFree(db, pTable->aCol);
     if( !IsVirtual(pTable) ){
@@ -1336,7 +1336,7 @@ begin_table_error:
 */
 #if SQLITE_ENABLE_HIDDEN_COLUMNS
 void sqlite3ColumnPropertiesFromName(Table *pTab, Column *pCol){
-  if( sqlite3_strnicmp(pCol->zName, "__hidden__", 10)==0 ){
+  if( sqlite3_strnicmp(pCol->zCnName, "__hidden__", 10)==0 ){
     pCol->colFlags |= COLFLAG_HIDDEN;
     if( pTab ) pTab->tabFlags |= TF_HasHidden;
   }else if( pTab && pCol!=pTab->aCol && (pCol[-1].colFlags & COLFLAG_HIDDEN) ){
@@ -1490,7 +1490,7 @@ void sqlite3AddColumn(Parse *pParse, Token sName, Token sType){
   sqlite3Dequote(z);
   hName = sqlite3StrIHash(z);
   for(i=0; i<p->nCol; i++){
-    if( p->aCol[i].hName==hName && sqlite3StrICmp(z, p->aCol[i].zName)==0 ){
+    if( p->aCol[i].hName==hName && sqlite3StrICmp(z, p->aCol[i].zCnName)==0 ){
       sqlite3ErrorMsg(pParse, "duplicate column name: %s", z);
       sqlite3DbFree(db, z);
       return;
@@ -1504,7 +1504,7 @@ void sqlite3AddColumn(Parse *pParse, Token sName, Token sType){
   p->aCol = aNew;
   pCol = &p->aCol[p->nCol];
   memset(pCol, 0, sizeof(p->aCol[0]));
-  pCol->zName = z;
+  pCol->zCnName = z;
   pCol->hName = hName;
   sqlite3ColumnPropertiesFromName(p, pCol);
  
@@ -1679,7 +1679,7 @@ void sqlite3AddDefaultValue(
     pCol = &(p->aCol[p->nCol-1]);
     if( !sqlite3ExprIsConstantOrFunction(pExpr, isInit) ){
       sqlite3ErrorMsg(pParse, "default value of column [%s] is not constant",
-          pCol->zName);
+          pCol->zCnName);
 #ifndef SQLITE_OMIT_GENERATED_COLUMNS
     }else if( pCol->colFlags & COLFLAG_GENERATED ){
       testcase( pCol->colFlags & COLFLAG_VIRTUAL );
@@ -1796,7 +1796,7 @@ void sqlite3AddPrimaryKey(
       if( pCExpr->op==TK_ID ){
         const char *zCName = pCExpr->u.zToken;
         for(iCol=0; iCol<pTab->nCol; iCol++){
-          if( sqlite3StrICmp(zCName, pTab->aCol[iCol].zName)==0 ){
+          if( sqlite3StrICmp(zCName, pTab->aCol[iCol].zCnName)==0 ){
             pCol = &pTab->aCol[iCol];
             makeColumnPartOfPrimaryKey(pParse, pCol);
             break;
@@ -1887,8 +1887,8 @@ void sqlite3AddCollateType(Parse *pParse, Token *pToken){
 
   if( sqlite3LocateCollSeq(pParse, zColl) ){
     Index *pIdx;
-    sqlite3DbFree(db, p->aCol[i].zColl);
-    p->aCol[i].zColl = zColl;
+    sqlite3DbFree(db, p->aCol[i].zCnColl);
+    p->aCol[i].zCnColl = zColl;
   
     /* If the column is declared as "<name> PRIMARY KEY COLLATE <type>",
     ** then an index may have been created on this column before the
@@ -1897,7 +1897,7 @@ void sqlite3AddCollateType(Parse *pParse, Token *pToken){
     for(pIdx=p->pIndex; pIdx; pIdx=pIdx->pNext){
       assert( pIdx->nKeyCol==1 );
       if( pIdx->aiColumn[0]==i ){
-        pIdx->azColl[0] = p->aCol[i].zColl;
+        pIdx->azColl[0] = p->aCol[i].zCnColl;
       }
     }
   }else{
@@ -1946,7 +1946,7 @@ void sqlite3AddGenerated(Parse *pParse, Expr *pExpr, Token *pType){
 
 generated_error:
   sqlite3ErrorMsg(pParse, "error in generated column \"%s\"",
-                  pCol->zName);
+                  pCol->zCnName);
 generated_done:
   sqlite3ExprDelete(pParse->db, pExpr);
 #else
@@ -2048,7 +2048,7 @@ static char *createTableStmt(sqlite3 *db, Table *p){
   Column *pCol;
   n = 0;
   for(pCol = p->aCol, i=0; i<p->nCol; i++, pCol++){
-    n += identLength(pCol->zName) + 5;
+    n += identLength(pCol->zCnName) + 5;
   }
   n += identLength(p->zName);
   if( n<50 ){ 
@@ -2084,7 +2084,7 @@ static char *createTableStmt(sqlite3 *db, Table *p){
     sqlite3_snprintf(n-k, &zStmt[k], zSep);
     k += sqlite3Strlen30(&zStmt[k]);
     zSep = zSep2;
-    identPut(zStmt, &k, pCol->zName);
+    identPut(zStmt, &k, pCol->zCnName);
     assert( pCol->affinity-SQLITE_AFF_BLOB >= 0 );
     assert( pCol->affinity-SQLITE_AFF_BLOB < ArraySize(azType) );
     testcase( pCol->affinity==SQLITE_AFF_BLOB );
@@ -2303,7 +2303,7 @@ static void convertToWithoutRowidTable(Parse *pParse, Table *pTab){
   if( pTab->iPKey>=0 ){
     ExprList *pList;
     Token ipkToken;
-    sqlite3TokenInit(&ipkToken, pTab->aCol[pTab->iPKey].zName);
+    sqlite3TokenInit(&ipkToken, pTab->aCol[pTab->iPKey].zCnName);
     pList = sqlite3ExprListAppend(pParse, 0, 
                   sqlite3ExprAlloc(db, TK_ID, &ipkToken, 0));
     if( pList==0 ){
@@ -3446,7 +3446,7 @@ void sqlite3CreateForeignKey(
     if( pToCol && pToCol->nExpr!=1 ){
       sqlite3ErrorMsg(pParse, "foreign key on %s"
          " should reference only one column of table %T",
-         p->aCol[iCol].zName, pTo);
+         p->aCol[iCol].zCnName, pTo);
       goto fk_end;
     }
     nCol = 1;
@@ -3486,7 +3486,7 @@ void sqlite3CreateForeignKey(
     for(i=0; i<nCol; i++){
       int j;
       for(j=0; j<p->nCol; j++){
-        if( sqlite3StrICmp(p->aCol[j].zName, pFromCol->a[i].zEName)==0 ){
+        if( sqlite3StrICmp(p->aCol[j].zCnName, pFromCol->a[i].zEName)==0 ){
           pFKey->aCol[i].iFrom = j;
           break;
         }
@@ -3941,7 +3941,7 @@ void sqlite3CreateIndex(
     Token prevCol;
     Column *pCol = &pTab->aCol[pTab->nCol-1];
     pCol->colFlags |= COLFLAG_UNIQUE;
-    sqlite3TokenInit(&prevCol, pCol->zName);
+    sqlite3TokenInit(&prevCol, pCol->zCnName);
     pList = sqlite3ExprListAppend(pParse, 0,
               sqlite3ExprAlloc(db, TK_ID, &prevCol, 0));
     if( pList==0 ) goto exit_create_index;
@@ -4062,7 +4062,7 @@ void sqlite3CreateIndex(
       zExtra += nColl;
       nExtra -= nColl;
     }else if( j>=0 ){
-      zColl = pTab->aCol[j].zColl;
+      zColl = pTab->aCol[j].zCnColl;
     }
     if( !zColl ) zColl = sqlite3StrBINARY;
     if( !db->init.busy && !sqlite3LocateCollSeq(pParse, zColl) ){
@@ -5154,7 +5154,7 @@ void sqlite3UniqueConstraint(
     for(j=0; j<pIdx->nKeyCol; j++){
       char *zCol;
       assert( pIdx->aiColumn[j]>=0 );
-      zCol = pTab->aCol[pIdx->aiColumn[j]].zName;
+      zCol = pTab->aCol[pIdx->aiColumn[j]].zCnName;
       if( j ) sqlite3_str_append(&errMsg, ", ", 2);
       sqlite3_str_appendall(&errMsg, pTab->zName);
       sqlite3_str_append(&errMsg, ".", 1);
@@ -5181,7 +5181,7 @@ void sqlite3RowidConstraint(
   int rc;
   if( pTab->iPKey>=0 ){
     zMsg = sqlite3MPrintf(pParse->db, "%s.%s", pTab->zName,
-                          pTab->aCol[pTab->iPKey].zName);
+                          pTab->aCol[pTab->iPKey].zCnName);
     rc = SQLITE_CONSTRAINT_PRIMARYKEY;
   }else{
     zMsg = sqlite3MPrintf(pParse->db, "%s.rowid", pTab->zName);
diff --git a/src/expr.c b/src/expr.c
index ca0c00a14d..0f900c0c6c 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -173,7 +173,7 @@ CollSeq *sqlite3ExprCollSeq(Parse *pParse, const Expr *pExpr){
       ** a TK_COLUMN but was previously evaluated and cached in a register */
       int j = p->iColumn;
       if( j>=0 ){
-        const char *zColl = p->y.pTab->aCol[j].zColl;
+        const char *zColl = p->y.pTab->aCol[j].zCnColl;
         pColl = sqlite3FindCollSeq(db, ENC(db), zColl, 0);
       }
       break;
@@ -3693,7 +3693,8 @@ void sqlite3ExprCodeGetColumnOfTable(
     }else if( (pCol = &pTab->aCol[iCol])->colFlags & COLFLAG_VIRTUAL ){
       Parse *pParse = sqlite3VdbeParser(v);
       if( pCol->colFlags & COLFLAG_BUSY ){
-        sqlite3ErrorMsg(pParse, "generated column loop on \"%s\"", pCol->zName);
+        sqlite3ErrorMsg(pParse, "generated column loop on \"%s\"",
+                        pCol->zCnName);
       }else{
         int savedSelfTab = pParse->iSelfTab;
         pCol->colFlags |= COLFLAG_BUSY;
@@ -3966,7 +3967,8 @@ expr_code_doover:
         if( pCol->iColumn<0 ){
           VdbeComment((v,"%s.rowid",pTab->zName));
         }else{
-          VdbeComment((v,"%s.%s",pTab->zName,pTab->aCol[pCol->iColumn].zName));
+          VdbeComment((v,"%s.%s", 
+              pTab->zName, pTab->aCol[pCol->iColumn].zCnName));
           if( pTab->aCol[pCol->iColumn].affinity==SQLITE_AFF_REAL ){
             sqlite3VdbeAddOp1(v, OP_RealAffinity, target);
           }
@@ -4027,7 +4029,7 @@ expr_code_doover:
           if( pCol->colFlags & COLFLAG_GENERATED ){
             if( pCol->colFlags & COLFLAG_BUSY ){
               sqlite3ErrorMsg(pParse, "generated column loop on \"%s\"",
-                              pCol->zName);
+                              pCol->zCnName);
               return 0;
             }
             pCol->colFlags |= COLFLAG_BUSY;
@@ -4510,7 +4512,7 @@ expr_code_doover:
       sqlite3VdbeAddOp2(v, OP_Param, p1, target);
       VdbeComment((v, "r[%d]=%s.%s", target,
         (pExpr->iTable ? "new" : "old"),
-        (pExpr->iColumn<0 ? "rowid" : pExpr->y.pTab->aCol[iCol].zName)
+        (pExpr->iColumn<0 ? "rowid" : pExpr->y.pTab->aCol[iCol].zCnName)
       ));
 
 #ifndef SQLITE_OMIT_FLOATING_POINT
diff --git a/src/fkey.c b/src/fkey.c
index ffb3a732eb..ee5aa5d98f 100644
--- a/src/fkey.c
+++ b/src/fkey.c
@@ -215,7 +215,9 @@ int sqlite3FkLocateIndex(
     */
     if( pParent->iPKey>=0 ){
       if( !zKey ) return 0;
-      if( !sqlite3StrICmp(pParent->aCol[pParent->iPKey].zName, zKey) ) return 0;
+      if( !sqlite3StrICmp(pParent->aCol[pParent->iPKey].zCnName, zKey) ){
+        return 0;
+      }
     }
   }else if( paiCol ){
     assert( nCol>1 );
@@ -257,11 +259,11 @@ int sqlite3FkLocateIndex(
           /* If the index uses a collation sequence that is different from
           ** the default collation sequence for the column, this index is
           ** unusable. Bail out early in this case.  */
-          zDfltColl = pParent->aCol[iCol].zColl;
+          zDfltColl = pParent->aCol[iCol].zCnColl;
           if( !zDfltColl ) zDfltColl = sqlite3StrBINARY;
           if( sqlite3StrICmp(pIdx->azColl[i], zDfltColl) ) break;
 
-          zIdxCol = pParent->aCol[iCol].zName;
+          zIdxCol = pParent->aCol[iCol].zCnName;
           for(j=0; j<nCol; j++){
             if( sqlite3StrICmp(pFKey->aCol[j].zCol, zIdxCol)==0 ){
               if( aiCol ) aiCol[i] = pFKey->aCol[j].iFrom;
@@ -485,7 +487,7 @@ static Expr *exprTableRegister(
       pCol = &pTab->aCol[iCol];
       pExpr->iTable = regBase + sqlite3TableColumnToStorage(pTab,iCol) + 1;
       pExpr->affExpr = pCol->affinity;
-      zColl = pCol->zColl;
+      zColl = pCol->zCnColl;
       if( zColl==0 ) zColl = db->pDfltColl->zName;
       pExpr = sqlite3ExprAddCollateString(pParse, pExpr, zColl);
     }else{
@@ -594,7 +596,7 @@ static void fkScanChildren(
     pLeft = exprTableRegister(pParse, pTab, regData, iCol);
     iCol = aiCol ? aiCol[i] : pFKey->aCol[0].iFrom;
     assert( iCol>=0 );
-    zCol = pFKey->pFrom->aCol[iCol].zName;
+    zCol = pFKey->pFrom->aCol[iCol].zCnName;
     pRight = sqlite3Expr(db, TK_ID, zCol);
     pEq = sqlite3PExpr(pParse, TK_EQ, pLeft, pRight);
     pWhere = sqlite3ExprAnd(pParse, pWhere, pEq);
@@ -629,7 +631,7 @@ static void fkScanChildren(
         i16 iCol = pIdx->aiColumn[i];
         assert( iCol>=0 );
         pLeft = exprTableRegister(pParse, pTab, regData, iCol);
-        pRight = sqlite3Expr(db, TK_ID, pTab->aCol[iCol].zName);
+        pRight = sqlite3Expr(db, TK_ID, pTab->aCol[iCol].zCnName);
         pEq = sqlite3PExpr(pParse, TK_IS, pLeft, pRight);
         pAll = sqlite3ExprAnd(pParse, pAll, pEq);
       }
@@ -821,7 +823,7 @@ static int fkParentIsModified(
       if( aChange[iKey]>=0 || (iKey==pTab->iPKey && bChngRowid) ){
         Column *pCol = &pTab->aCol[iKey];
         if( zKey ){
-          if( 0==sqlite3StrICmp(pCol->zName, zKey) ) return 1;
+          if( 0==sqlite3StrICmp(pCol->zCnName, zKey) ) return 1;
         }else if( pCol->colFlags & COLFLAG_PRIMKEY ){
           return 1;
         }
@@ -962,7 +964,7 @@ void sqlite3FkCheck(
       ** values read from the parent table are NULL. */
       if( db->xAuth ){
         int rcauth;
-        char *zCol = pTo->aCol[pIdx ? pIdx->aiColumn[i] : pTo->iPKey].zName;
+        char *zCol = pTo->aCol[pIdx ? pIdx->aiColumn[i] : pTo->iPKey].zCnName;
         rcauth = sqlite3AuthReadCol(pParse, pTo->zName, zCol, iDb);
         bIgnore = (rcauth==SQLITE_IGNORE);
       }
@@ -1236,8 +1238,8 @@ static Trigger *fkActionTrigger(
       assert( pIdx!=0 || (pTab->iPKey>=0 && pTab->iPKey<pTab->nCol) );
       assert( pIdx==0 || pIdx->aiColumn[i]>=0 );
       sqlite3TokenInit(&tToCol,
-                   pTab->aCol[pIdx ? pIdx->aiColumn[i] : pTab->iPKey].zName);
-      sqlite3TokenInit(&tFromCol, pFKey->pFrom->aCol[iFromCol].zName);
+                   pTab->aCol[pIdx ? pIdx->aiColumn[i] : pTab->iPKey].zCnName);
+      sqlite3TokenInit(&tFromCol, pFKey->pFrom->aCol[iFromCol].zCnName);
 
       /* Create the expression "OLD.zToCol = zFromCol". It is important
       ** that the "OLD.zToCol" term is on the LHS of the = operator, so
diff --git a/src/insert.c b/src/insert.c
index bff75a0a69..06952586b0 100644
--- a/src/insert.c
+++ b/src/insert.c
@@ -308,7 +308,7 @@ void sqlite3ComputeGeneratedColumns(
     }
   }while( pRedo && eProgress );
   if( pRedo ){
-    sqlite3ErrorMsg(pParse, "generated column loop on \"%s\"", pRedo->zName);
+    sqlite3ErrorMsg(pParse, "generated column loop on \"%s\"", pRedo->zCnName);
   }
   pParse->iSelfTab = 0;
 }
@@ -794,7 +794,7 @@ void sqlite3Insert(
     }
     for(i=0; i<pColumn->nId; i++){
       for(j=0; j<pTab->nCol; j++){
-        if( sqlite3StrICmp(pColumn->a[i].zName, pTab->aCol[j].zName)==0 ){
+        if( sqlite3StrICmp(pColumn->a[i].zName, pTab->aCol[j].zCnName)==0 ){
           pColumn->a[i].idx = j;
           if( i!=j ) bIdListInOrder = 0;
           if( j==pTab->iPKey ){
@@ -804,7 +804,7 @@ void sqlite3Insert(
           if( pTab->aCol[j].colFlags & (COLFLAG_STORED|COLFLAG_VIRTUAL) ){
             sqlite3ErrorMsg(pParse, 
                "cannot INSERT into generated column \"%s\"",
-               pTab->aCol[j].zName);
+               pTab->aCol[j].zCnName);
             goto insert_cleanup;
           }
 #endif
@@ -1708,7 +1708,7 @@ void sqlite3GenerateConstraintChecks(
           case OE_Rollback:
           case OE_Fail: {
             char *zMsg = sqlite3MPrintf(db, "%s.%s", pTab->zName,
-                                        pCol->zName);
+                                        pCol->zCnName);
             sqlite3VdbeAddOp3(v, OP_HaltIfNull, SQLITE_CONSTRAINT_NOTNULL,
                               onError, iReg);
             sqlite3VdbeAppendP4(v, zMsg, P4_DYNAMIC);
@@ -2126,7 +2126,7 @@ void sqlite3GenerateConstraintChecks(
         testcase( sqlite3TableColumnToStorage(pTab, iField)!=iField );
         x = sqlite3TableColumnToStorage(pTab, iField) + regNewData + 1;
         sqlite3VdbeAddOp2(v, OP_SCopy, x, regIdx+i);
-        VdbeComment((v, "%s", pTab->aCol[iField].zName));
+        VdbeComment((v, "%s", pTab->aCol[iField].zCnName));
       }
     }
     sqlite3VdbeAddOp3(v, OP_MakeRecord, regIdx, pIdx->nColumn, aRegIdx[ix]);
@@ -2220,7 +2220,7 @@ void sqlite3GenerateConstraintChecks(
             x = sqlite3TableColumnToIndex(pIdx, pPk->aiColumn[i]);
             sqlite3VdbeAddOp3(v, OP_Column, iThisCur, x, regR+i);
             VdbeComment((v, "%s.%s", pTab->zName,
-                         pTab->aCol[pPk->aiColumn[i]].zName));
+                         pTab->aCol[pPk->aiColumn[i]].zCnName));
           }
         }
         if( isUpdate ){
@@ -2843,7 +2843,7 @@ static int xferOptimization(
     if( pDestCol->affinity!=pSrcCol->affinity ){
       return 0;    /* Affinity must be the same on all columns */
     }
-    if( sqlite3_stricmp(pDestCol->zColl, pSrcCol->zColl)!=0 ){
+    if( sqlite3_stricmp(pDestCol->zCnColl, pSrcCol->zCnColl)!=0 ){
       return 0;    /* Collating sequence must be the same on all columns */
     }
     if( pDestCol->notNull && !pSrcCol->notNull ){
diff --git a/src/main.c b/src/main.c
index 2dc29593dc..3c1191c368 100644
--- a/src/main.c
+++ b/src/main.c
@@ -3742,7 +3742,7 @@ int sqlite3_table_column_metadata(
   }else{
     for(iCol=0; iCol<pTab->nCol; iCol++){
       pCol = &pTab->aCol[iCol];
-      if( 0==sqlite3StrICmp(pCol->zName, zColumnName) ){
+      if( 0==sqlite3StrICmp(pCol->zCnName, zColumnName) ){
         break;
       }
     }
@@ -3769,7 +3769,7 @@ int sqlite3_table_column_metadata(
   */ 
   if( pCol ){
     zDataType = sqlite3ColumnType(pCol,0);
-    zCollSeq = pCol->zColl;
+    zCollSeq = pCol->zCnColl;
     notnull = pCol->notNull!=0;
     primarykey  = (pCol->colFlags & COLFLAG_PRIMKEY)!=0;
     autoinc = pTab->iPKey==iCol && (pTab->tabFlags & TF_Autoincrement)!=0;
diff --git a/src/pragma.c b/src/pragma.c
index 2606e85506..c931dd2acb 100644
--- a/src/pragma.c
+++ b/src/pragma.c
@@ -1182,7 +1182,7 @@ void sqlite3Pragma(
              || isHidden>=2 );
         sqlite3VdbeMultiLoad(v, 1, pPragma->iArg ? "issisii" : "issisi",
                i-nHidden,
-               pCol->zName,
+               pCol->zCnName,
                sqlite3ColumnType(pCol,""),
                pCol->notNull ? 1 : 0,
                isHidden>=2 || sqlite3ColumnExpr(pTab,pCol)==0 ? 0 :
@@ -1253,7 +1253,7 @@ void sqlite3Pragma(
       for(i=0; i<mx; i++){
         i16 cnum = pIdx->aiColumn[i];
         sqlite3VdbeMultiLoad(v, 1, "iisX", i, cnum,
-                             cnum<0 ? 0 : pTab->aCol[cnum].zName);
+                             cnum<0 ? 0 : pTab->aCol[cnum].zCnName);
         if( pPragma->iArg ){
           sqlite3VdbeMultiLoad(v, 4, "isiX",
             pIdx->aSortOrder[i],
@@ -1374,7 +1374,7 @@ void sqlite3Pragma(
                    i,
                    j,
                    pFK->zTo,
-                   pTab->aCol[pFK->aCol[j].iFrom].zName,
+                   pTab->aCol[pFK->aCol[j].iFrom].zCnName,
                    pFK->aCol[j].zCol,
                    actionName(pFK->aAction[1]),  /* ON UPDATE */
                    actionName(pFK->aAction[0]),  /* ON DELETE */
@@ -1687,7 +1687,7 @@ void sqlite3Pragma(
           }
           jmp2 = sqlite3VdbeAddOp1(v, OP_NotNull, 3); VdbeCoverage(v);
           zErr = sqlite3MPrintf(db, "NULL value in %s.%s", pTab->zName,
-                              pTab->aCol[j].zName);
+                              pTab->aCol[j].zCnName);
           sqlite3VdbeAddOp4(v, OP_String8, 0, 3, 0, zErr, P4_DYNAMIC);
           integrityCheckResultRow(v);
           sqlite3VdbeJumpHere(v, jmp2);
diff --git a/src/resolve.c b/src/resolve.c
index d509de7953..3c1311417b 100644
--- a/src/resolve.c
+++ b/src/resolve.c
@@ -333,7 +333,9 @@ static int lookupName(
         }
         hCol = sqlite3StrIHash(zCol);
         for(j=0, pCol=pTab->aCol; j<pTab->nCol; j++, pCol++){
-          if( pCol->hName==hCol && sqlite3StrICmp(pCol->zName, zCol)==0 ){
+          if( pCol->hName==hCol
+           && sqlite3StrICmp(pCol->zCnName, zCol)==0
+          ){
             /* If there has been exactly one prior match and this match
             ** is for the right-hand table of a NATURAL JOIN or is in a 
             ** USING clause, then skip this match.
@@ -410,7 +412,9 @@ static int lookupName(
         pSchema = pTab->pSchema;
         cntTab++;
         for(iCol=0, pCol=pTab->aCol; iCol<pTab->nCol; iCol++, pCol++){
-          if( pCol->hName==hCol && sqlite3StrICmp(pCol->zName, zCol)==0 ){
+          if( pCol->hName==hCol
+           && sqlite3StrICmp(pCol->zCnName, zCol)==0
+          ){
             if( iCol==pTab->iPKey ){
               iCol = -1;
             }
diff --git a/src/select.c b/src/select.c
index d6708c231f..064ea758d8 100644
--- a/src/select.c
+++ b/src/select.c
@@ -271,7 +271,7 @@ int sqlite3ColumnIndex(Table *pTab, const char *zCol){
   u8 h = sqlite3StrIHash(zCol);
   Column *pCol;
   for(pCol=pTab->aCol, i=0; i<pTab->nCol; pCol++, i++){
-    if( pCol->hName==h && sqlite3StrICmp(pCol->zName, zCol)==0 ) return i;
+    if( pCol->hName==h && sqlite3StrICmp(pCol->zCnName, zCol)==0 ) return i;
   }
   return -1;
 }
@@ -470,7 +470,7 @@ static int sqliteProcessJoin(Parse *pParse, Select *p){
         int iLeftCol;  /* Matching column in the left table */
 
         if( IsHiddenColumn(&pRightTab->aCol[j]) ) continue;
-        zName = pRightTab->aCol[j].zName;
+        zName = pRightTab->aCol[j].zCnName;
         if( tableAndColumnIndex(pSrc, i+1, zName, &iLeft, &iLeftCol, 1) ){
           addWhereTerm(pParse, pSrc, iLeft, iLeftCol, i+1, j,
                 isOuter, &p->pWhere);
@@ -1837,7 +1837,7 @@ static const char *columnTypeImpl(
           zType = "INTEGER";
           zOrigCol = "rowid";
         }else{
-          zOrigCol = pTab->aCol[iCol].zName;
+          zOrigCol = pTab->aCol[iCol].zCnName;
           zType = sqlite3ColumnType(&pTab->aCol[iCol],0);
         }
         zOrigTab = pTab->zName;
@@ -2009,7 +2009,7 @@ void sqlite3GenerateColumnNames(
       if( iCol<0 ){
         zCol = "rowid";
       }else{
-        zCol = pTab->aCol[iCol].zName;
+        zCol = pTab->aCol[iCol].zCnName;
       }
       if( fullName ){
         char *zName = 0;
@@ -2094,7 +2094,7 @@ int sqlite3ColumnsFromExprList(
         /* For columns use the column name name */
         int iCol = pColExpr->iColumn;
         if( iCol<0 ) iCol = pTab->iPKey;
-        zName = iCol>=0 ? pTab->aCol[iCol].zName : "rowid";
+        zName = iCol>=0 ? pTab->aCol[iCol].zCnName : "rowid";
       }else if( pColExpr->op==TK_ID ){
         assert( !ExprHasProperty(pColExpr, EP_IntValue) );
         zName = pColExpr->u.zToken;
@@ -2122,7 +2122,7 @@ int sqlite3ColumnsFromExprList(
       zName = sqlite3MPrintf(db, "%.*z:%u", nName, zName, ++cnt);
       if( cnt>3 ) sqlite3_randomness(sizeof(cnt), &cnt);
     }
-    pCol->zName = zName;
+    pCol->zCnName = zName;
     pCol->hName = sqlite3StrIHash(zName);
     sqlite3ColumnPropertiesFromName(0, pCol);
     if( zName && sqlite3HashInsert(&ht, zName, pCol)==pCol ){
@@ -2132,7 +2132,7 @@ int sqlite3ColumnsFromExprList(
   sqlite3HashClear(&ht);
   if( db->mallocFailed ){
     for(j=0; j<i; j++){
-      sqlite3DbFree(db, aCol[j].zName);
+      sqlite3DbFree(db, aCol[j].zCnName);
     }
     sqlite3DbFree(db, aCol);
     *paCol = 0;
@@ -2184,17 +2184,17 @@ void sqlite3SelectAddColumnTypeAndCollation(
     pCol->affinity = sqlite3ExprAffinity(p);
     if( zType ){
       m = sqlite3Strlen30(zType);
-      n = sqlite3Strlen30(pCol->zName);
-      pCol->zName = sqlite3DbReallocOrFree(db, pCol->zName, n+m+2);
-      if( pCol->zName ){
-        memcpy(&pCol->zName[n+1], zType, m+1);
+      n = sqlite3Strlen30(pCol->zCnName);
+      pCol->zCnName = sqlite3DbReallocOrFree(db, pCol->zCnName, n+m+2);
+      if( pCol->zCnName ){
+        memcpy(&pCol->zCnName[n+1], zType, m+1);
         pCol->colFlags |= COLFLAG_HASTYPE;
       }
     }
     if( pCol->affinity<=SQLITE_AFF_NONE ) pCol->affinity = aff;
     pColl = sqlite3ExprCollSeq(pParse, p);
-    if( pColl && pCol->zColl==0 ){
-      pCol->zColl = sqlite3DbStrDup(db, pColl->zName);
+    if( pColl && pCol->zCnColl==0 ){
+      pCol->zCnColl = sqlite3DbStrDup(db, pColl->zName);
     }
   }
   pTab->szTabRow = 1; /* Any non-zero value works */
@@ -5602,7 +5602,7 @@ static int selectExpander(Walker *pWalker, Select *p){
             zSchemaName = iDb>=0 ? db->aDb[iDb].zDbSName : "*";
           }
           for(j=0; j<pTab->nCol; j++){
-            char *zName = pTab->aCol[j].zName;
+            char *zName = pTab->aCol[j].zCnName;
             char *zColname;  /* The computed column name */
             char *zToFree;   /* Malloced string that needs to be freed */
             Token sColname;  /* Computed column name as a token */
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 9a2c49e526..083ba5a335 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -2030,8 +2030,8 @@ struct Module {
 **                            columns to the left.
 */
 struct Column {
-  char *zName;     /* Name of this column, \000, then the type */
-  char *zColl;     /* Collating sequence.  If NULL, use the default */
+  char *zCnName;   /* Name of this column */
+  char *zCnColl;   /* Collating sequence.  If NULL, use the default */
   u8 notNull : 4;  /* An OE_ code for handling a NOT NULL constraint */
   u8 eType : 4;    /* One of the standard types */
   char affinity;   /* One of the SQLITE_AFF_... values */
diff --git a/src/trigger.c b/src/trigger.c
index 4db697c655..d7a4507e80 100644
--- a/src/trigger.c
+++ b/src/trigger.c
@@ -877,11 +877,11 @@ static ExprList *sqlite3ExpandReturning(
       for(jj=0; jj<pTab->nCol; jj++){
         Expr *pNewExpr;
         if( IsHiddenColumn(pTab->aCol+jj) ) continue;
-        pNewExpr = sqlite3Expr(db, TK_ID, pTab->aCol[jj].zName);
+        pNewExpr = sqlite3Expr(db, TK_ID, pTab->aCol[jj].zCnName);
         pNew = sqlite3ExprListAppend(pParse, pNew, pNewExpr);
         if( !db->mallocFailed ){
           struct ExprList_item *pItem = &pNew->a[pNew->nExpr-1];
-          pItem->zEName = sqlite3DbStrDup(db, pTab->aCol[jj].zName);
+          pItem->zEName = sqlite3DbStrDup(db, pTab->aCol[jj].zCnName);
           pItem->eEName = ENAME_NAME;
         }
       }
diff --git a/src/update.c b/src/update.c
index 6f503c32f8..484bee47cd 100644
--- a/src/update.c
+++ b/src/update.c
@@ -64,7 +64,7 @@ void sqlite3ColumnDefault(Vdbe *v, Table *pTab, int i, int iReg){
     sqlite3_value *pValue = 0;
     u8 enc = ENC(sqlite3VdbeDb(v));
     Column *pCol = &pTab->aCol[i];
-    VdbeComment((v, "%s.%s", pTab->zName, pCol->zName));
+    VdbeComment((v, "%s.%s", pTab->zName, pCol->zCnName));
     assert( i<pTab->nCol );
     sqlite3ValueFromExpr(sqlite3VdbeDb(v), 
                          sqlite3ColumnExpr(pTab,pCol), enc, 
@@ -451,13 +451,16 @@ void sqlite3Update(
   */
   chngRowid = chngPk = 0;
   for(i=0; i<pChanges->nExpr; i++){
+    u8 hCol = sqlite3StrIHash(pChanges->a[i].zEName);
     /* If this is an UPDATE with a FROM clause, do not resolve expressions
     ** here. The call to sqlite3Select() below will do that. */
     if( nChangeFrom==0 && sqlite3ResolveExprNames(&sNC, pChanges->a[i].pExpr) ){
       goto update_cleanup;
     }
     for(j=0; j<pTab->nCol; j++){
-      if( sqlite3StrICmp(pTab->aCol[j].zName, pChanges->a[i].zEName)==0 ){
+      if( pTab->aCol[j].hName==hCol
+       && sqlite3StrICmp(pTab->aCol[j].zCnName, pChanges->a[i].zEName)==0
+      ){
         if( j==pTab->iPKey ){
           chngRowid = 1;
           pRowidExpr = pChanges->a[i].pExpr;
@@ -471,7 +474,7 @@ void sqlite3Update(
           testcase( pTab->aCol[j].colFlags & COLFLAG_STORED );
           sqlite3ErrorMsg(pParse, 
              "cannot UPDATE generated column \"%s\"",
-             pTab->aCol[j].zName);
+             pTab->aCol[j].zCnName);
           goto update_cleanup;
         }
 #endif
@@ -495,7 +498,7 @@ void sqlite3Update(
     {
       int rc;
       rc = sqlite3AuthCheck(pParse, SQLITE_UPDATE, pTab->zName,
-                            j<0 ? "ROWID" : pTab->aCol[j].zName,
+                            j<0 ? "ROWID" : pTab->aCol[j].zCnName,
                             db->aDb[iDb].zDbSName);
       if( rc==SQLITE_DENY ){
         goto update_cleanup;
diff --git a/src/upsert.c b/src/upsert.c
index 982dc7dbc1..fb6c7c0c07 100644
--- a/src/upsert.c
+++ b/src/upsert.c
@@ -287,7 +287,7 @@ void sqlite3UpsertDoUpdate(
         k = sqlite3TableColumnToIndex(pIdx, pPk->aiColumn[i]);
         sqlite3VdbeAddOp3(v, OP_Column, iCur, k, iPk+i);
         VdbeComment((v, "%s.%s", pIdx->zName,
-                    pTab->aCol[pPk->aiColumn[i]].zName));
+                    pTab->aCol[pPk->aiColumn[i]].zCnName));
       }
       sqlite3VdbeVerifyAbortable(v, OE_Abort);
       i = sqlite3VdbeAddOp4Int(v, OP_Found, iDataCur, 0, iPk, nPk);
diff --git a/src/util.c b/src/util.c
index d513d8f79b..08c2949b17 100644
--- a/src/util.c
+++ b/src/util.c
@@ -90,7 +90,7 @@ int sqlite3Strlen30(const char *z){
 */
 char *sqlite3ColumnType(Column *pCol, char *zDflt){
   if( pCol->colFlags & COLFLAG_HASTYPE ){
-    return pCol->zName + strlen(pCol->zName) + 1;
+    return pCol->zCnName + strlen(pCol->zCnName) + 1;
   }else if( pCol->eType ){
     assert( pCol->eType<=SQLITE_N_STDTYPE );
     return (char*)sqlite3StdType[pCol->eType-1];
diff --git a/src/vdbeblob.c b/src/vdbeblob.c
index 34cf880eca..cc427b9c34 100644
--- a/src/vdbeblob.c
+++ b/src/vdbeblob.c
@@ -187,7 +187,7 @@ int sqlite3_blob_open(
 
     /* Now search pTab for the exact column. */
     for(iCol=0; iCol<pTab->nCol; iCol++) {
-      if( sqlite3StrICmp(pTab->aCol[iCol].zName, zColumn)==0 ){
+      if( sqlite3StrICmp(pTab->aCol[iCol].zCnName, zColumn)==0 ){
         break;
       }
     }
diff --git a/src/where.c b/src/where.c
index d7ef319b57..5073b6c82c 100644
--- a/src/where.c
+++ b/src/where.c
@@ -805,7 +805,7 @@ static void constructAutomaticIndex(
       if( !sentWarning ){
         sqlite3_log(SQLITE_WARNING_AUTOINDEX,
             "automatic index on %s(%s)", pTable->zName,
-            pTable->aCol[iCol].zName);
+            pTable->aCol[iCol].zCnName);
         sentWarning = 1;
       }
       if( (idxCols & cMask)==0 ){
diff --git a/src/wherecode.c b/src/wherecode.c
index 84fa1a1410..f3589bb0ac 100644
--- a/src/wherecode.c
+++ b/src/wherecode.c
@@ -29,7 +29,7 @@ static const char *explainIndexColumnName(Index *pIdx, int i){
   i = pIdx->aiColumn[i];
   if( i==XN_EXPR ) return "<expr>";
   if( i==XN_ROWID ) return "rowid";
-  return pIdx->pTable->aCol[i].zName;
+  return pIdx->pTable->aCol[i].zCnName;
 }
 
 /*
@@ -1241,8 +1241,8 @@ static void whereIndexExprTrans(
 #ifndef SQLITE_OMIT_GENERATED_COLUMNS
     }else if( iRef>=0
        && (pTab->aCol[iRef].colFlags & COLFLAG_VIRTUAL)!=0
-       && (pTab->aCol[iRef].zColl==0
-           || sqlite3StrICmp(pTab->aCol[iRef].zColl, sqlite3StrBINARY)==0)
+       && (pTab->aCol[iRef].zCnColl==0
+           || sqlite3StrICmp(pTab->aCol[iRef].zCnColl, sqlite3StrBINARY)==0)
     ){
       /* Check to see if there are direct references to generated columns
       ** that are contained in the index.  Pulling the generated column