From: drh <drh@noemail.net>
Date: Wed, 5 Dec 2018 17:48:57 +0000 (+0000)
Subject: Simplifications to the sqlite3_normalized_sql() implementation.
X-Git-Tag: version-3.27.0~330
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=19efd0db4133f2d0f9985856ae9b4b5572abf733;p=thirdparty%2Fsqlite.git

Simplifications to the sqlite3_normalized_sql() implementation.

FossilOrigin-Name: 94ea6379178e3ff6a0d1d5819ca4ac558bdadb1ca8a3637c797079db7dc0cd61
---

diff --git a/manifest b/manifest
index fabc9f14b7..06972a00ce 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Ensure\sthat\sALTER\sTABLE\smodifies\stable\sand\scolumn\snames\sembedded\sin\sWITH\nclauses\sthat\sare\spart\sof\sviews\sand\striggers.
-D 2018-12-05T13:49:04.148
+C Simplifications\sto\sthe\ssqlite3_normalized_sql()\simplementation.
+D 2018-12-05T17:48:57.422
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F Makefile.in 68d0ba0f0b533d5bc84c78c13a6ce84ee81183a67014caa47a969e67f028fa1c
@@ -452,7 +452,7 @@ F src/btree.c ba7c7eef4461790f37c309936bfc5d0d6ba9b194b02d3c8ff1fd53b420ea6d3b
 F src/btree.h febb2e817be499570b7a2e32a9bbb4b607a9234f6b84bb9ae84916d4806e96f2
 F src/btreeInt.h 620ab4c7235f43572cf3ac2ac8723cbdf68073be4d29da24897c7b77dda5fd96
 F src/build.c fce47a9789704e65c63299b01be8153745faee7919f5137d3f29b7c3c0b549bd
-F src/callback.c 789bd33d188146f66c0dd8306472a72d1c05f71924b24a91caf6bd45cf9aba73
+F src/callback.c 25dda5e1c2334a367b94a64077b1d06b2553369f616261ca6783c48bcb6bda73
 F src/complete.c a3634ab1e687055cd002e11b8f43eb75c17da23e
 F src/ctime.c 109e58d00f62e8e71ee1eb5944ac18b90171c928ab2e082e058056e1137cc20b
 F src/date.c ebe1dc7c8a347117bb02570f1a931c62dd78f4a2b1b516f4837d45b7d6426957
@@ -464,8 +464,8 @@ F src/fault.c 460f3e55994363812d9d60844b2a6de88826e007
 F src/fkey.c 972a4ba14296bef2303a0abbad1e3d82bc3c61f9e6ce4e8e9528bdee68748812
 F src/func.c 7c288b4ce309b5a8b8473514b88e1f8e69a80134509a8c0db8e39c858e367e7f
 F src/global.c 8291eee0782b83124de14ec0389ec9fd6ae1873358a6b0d9469fe17a46ad803b
-F src/hash.c 6d2f67276469384fb8784fb8e962deeaae6832955626468325d705a01b999594
-F src/hash.h eebf2250e56b5d5353b873406557e373d2888cf51f111e28917666456d479e85
+F src/hash.c a12580e143f10301ed5166ea4964ae2853d3905a511d4e0c44497245c7ce1f7a
+F src/hash.h ab34c5c54a9e9de2e790b24349ba5aab3dbb4fd4
 F src/hwtime.h 747c1bbe9df21a92e9c50f3bbec1de841dc5e5da
 F src/in-operator.md 10cd8f4bcd225a32518407c2fb2484089112fd71
 F src/insert.c f12f27eb606d601825be9a229a7390a8d64d40226697883f96de8e088d620055
@@ -502,7 +502,7 @@ F src/pcache.h 4f87acd914cef5016fae3030343540d75f5b85a1877eed1a2a19b9f284248586
 F src/pcache1.c ad0ffc5b35b0280d045ac569d34d4b842e3e6a4a118f6396b320987a0957afcc
 F src/pragma.c 4e056f042683b99c4ea0db395f68d051b1a95833ab40951c40d3ef7e1fee1354
 F src/pragma.h fdd03d78a7497f74a3f652909f945328480089189526841ae829ce7313d98d13
-F src/prepare.c 277c8af17124bd4f67ae6e1a8e795a91f12bf7ce3a4b344c7eac46d360250c20
+F src/prepare.c f77ebf812f46a174e805d939cec0017771904e79049d04edf66dbbb3ec25ad3e
 F src/printf.c 0f1177cf1dd4d7827bf64d840768514ec76409abecaca9e8b577dbd065150381
 F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
 F src/resolve.c 976e7879286a1eecdc71ceff64f6d1b3f58c8f8096537ba668b3dc0887f410c1
@@ -512,7 +512,7 @@ F src/shell.c.in 1f0819e69fb1ebd2eb44695530dc43936608bf9b752981a0ffd4e2e4a9e3883
 F src/sqlite.h.in cce9feede1c1c03923c091b4bbbd081dd77aaf92024cc2cdbf65f712c2f668c3
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h 960f1b86c3610fa23cb6a267572a97dcf286e77aa0dd3b9b23292ffaa1ea8683
-F src/sqliteInt.h 128f2ef4cd6037300cb5510dd3c882417b225d6f4ed6210bddfd920104c7341f
+F src/sqliteInt.h e96520f27310016d0dabb496e13346244bbea83a6adc3134810e026f1d4a02b6
 F src/sqliteLimit.h 1513bfb7b20378aa0041e7022d04acb73525de35b80b252f1b83fedb4de6a76b
 F src/status.c 46e7aec11f79dad50965a5ca5fa9de009f7d6bde08be2156f1538a0a296d4d0e
 F src/table.c b46ad567748f24a326d9de40e5b9659f96ffff34
@@ -1782,7 +1782,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 7da617e97eb905cb009c47403786682b911e32a630f266e1c53ea72836fc88b5
-R 5be4b63edcb6a436be7d6ac2ccab0473
-U dan
-Z 758395cc3e6658700c83b35c2e31d2cc
+P f44bc7a8b3fac82aa5598e9bdaf65ea4dd3c331cf90c1d5ba26ff1698e92c230
+R 14f7302635d9f1332de56d5fb4d8f1a4
+U drh
+Z b51bb6387d49f37b8a1232489a1c6ba3
diff --git a/manifest.uuid b/manifest.uuid
index 7bb95e4443..6334ab25e4 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-f44bc7a8b3fac82aa5598e9bdaf65ea4dd3c331cf90c1d5ba26ff1698e92c230
\ No newline at end of file
+94ea6379178e3ff6a0d1d5819ca4ac558bdadb1ca8a3637c797079db7dc0cd61
\ No newline at end of file
diff --git a/src/callback.c b/src/callback.c
index faf6d520c4..ad53bd4d3c 100644
--- a/src/callback.c
+++ b/src/callback.c
@@ -283,7 +283,7 @@ static int matchQuality(
 ** Search a FuncDefHash for a function with the given name.  Return
 ** a pointer to the matching FuncDef if found, or 0 if there is no match.
 */
-static FuncDef *functionSearch(
+FuncDef *sqlite3FunctionSearch(
   int h,               /* Hash of the name */
   const char *zFunc    /* Name of function */
 ){
@@ -295,21 +295,6 @@ static FuncDef *functionSearch(
   }
   return 0;
 }
-#ifdef SQLITE_ENABLE_NORMALIZE
-FuncDef *sqlite3FunctionSearchN(
-  int h,               /* Hash of the name */
-  const char *zFunc,   /* Name of function */
-  int nFunc            /* Length of the name */
-){
-  FuncDef *p;
-  for(p=sqlite3BuiltinFunctions.a[h]; p; p=p->u.pHash){
-    if( sqlite3StrNICmp(p->zName, zFunc, nFunc)==0 ){
-      return p;
-    }
-  }
-  return 0;
-}
-#endif /* SQLITE_ENABLE_NORMALIZE */
 
 /*
 ** Insert a new FuncDef into a FuncDefHash hash table.
@@ -325,7 +310,7 @@ void sqlite3InsertBuiltinFuncs(
     int nName = sqlite3Strlen30(zName);
     int h = SQLITE_FUNC_HASH(zName[0], nName);
     assert( zName[0]>='a' && zName[0]<='z' );
-    pOther = functionSearch(h, zName);
+    pOther = sqlite3FunctionSearch(h, zName);
     if( pOther ){
       assert( pOther!=&aDef[i] && pOther->pNext!=&aDef[i] );
       aDef[i].pNext = pOther->pNext;
@@ -403,7 +388,7 @@ FuncDef *sqlite3FindFunction(
   if( !createFlag && (pBest==0 || (db->mDbFlags & DBFLAG_PreferBuiltin)!=0) ){
     bestScore = 0;
     h = SQLITE_FUNC_HASH(sqlite3UpperToLower[(u8)zName[0]], nName);
-    p = functionSearch(h, zName);
+    p = sqlite3FunctionSearch(h, zName);
     while( p ){
       int score = matchQuality(p, nArg, enc);
       if( score>bestScore ){
diff --git a/src/hash.c b/src/hash.c
index e725f2aa5e..79bb85ac01 100644
--- a/src/hash.c
+++ b/src/hash.c
@@ -64,20 +64,6 @@ static unsigned int strHash(const char *z){
   }
   return h;
 }
-#ifdef SQLITE_ENABLE_NORMALIZE
-static unsigned int strHashN(const char *z, int n){
-  unsigned int h = 0;
-  int i;
-  for(i=0; i<n; i++){
-    /* Knuth multiplicative hashing.  (Sorting & Searching, p. 510).
-    ** 0x9e3779b1 is 2654435761 which is the closest prime number to
-    ** (2**32)*golden_ratio, where golden_ratio = (sqrt(5) - 1)/2. */
-    h += sqlite3UpperToLower[(unsigned char)z[i]];
-    h *= 0x9e3779b1;
-  }
-  return h;
-}
-#endif /* SQLITE_ENABLE_NORMALIZE */
 
 
 /* Link pNew element into the hash table pH.  If pEntry!=0 then also
@@ -189,40 +175,6 @@ static HashElem *findElementWithHash(
   }
   return &nullElement;
 }
-#ifdef SQLITE_ENABLE_NORMALIZE
-static HashElem *findElementWithHashN(
-  const Hash *pH,     /* The pH to be searched */
-  const char *pKey,   /* The key we are searching for */
-  int nKey,           /* Number of key bytes to use */
-  unsigned int *pHash /* Write the hash value here */
-){
-  HashElem *elem;                /* Used to loop thru the element list */
-  int count;                     /* Number of elements left to test */
-  unsigned int h;                /* The computed hash */
-  static HashElem nullElement = { 0, 0, 0, 0 };
-
-  if( pH->ht ){   /*OPTIMIZATION-IF-TRUE*/
-    struct _ht *pEntry;
-    h = strHashN(pKey, nKey) % pH->htsize;
-    pEntry = &pH->ht[h];
-    elem = pEntry->chain;
-    count = pEntry->count;
-  }else{
-    h = 0;
-    elem = pH->first;
-    count = pH->count;
-  }
-  if( pHash ) *pHash = h;
-  while( count-- ){
-    assert( elem!=0 );
-    if( sqlite3StrNICmp(elem->pKey,pKey,nKey)==0 ){ 
-      return elem;
-    }
-    elem = elem->next;
-  }
-  return &nullElement;
-}
-#endif /* SQLITE_ENABLE_NORMALIZE */
 
 /* Remove a single entry from the hash table given a pointer to that
 ** element and a hash on the element's key.
@@ -267,14 +219,6 @@ void *sqlite3HashFind(const Hash *pH, const char *pKey){
   assert( pKey!=0 );
   return findElementWithHash(pH, pKey, 0)->data;
 }
-#ifdef SQLITE_ENABLE_NORMALIZE
-void *sqlite3HashFindN(const Hash *pH, const char *pKey, int nKey){
-  assert( pH!=0 );
-  assert( pKey!=0 );
-  assert( nKey>=0 );
-  return findElementWithHashN(pH, pKey, nKey, 0)->data;
-}
-#endif /* SQLITE_ENABLE_NORMALIZE */
 
 /* Insert an element into the hash table pH.  The key is pKey
 ** and the data is "data".
diff --git a/src/hash.h b/src/hash.h
index cf773663b7..90540eda50 100644
--- a/src/hash.h
+++ b/src/hash.h
@@ -68,9 +68,6 @@ struct HashElem {
 void sqlite3HashInit(Hash*);
 void *sqlite3HashInsert(Hash*, const char *pKey, void *pData);
 void *sqlite3HashFind(const Hash*, const char *pKey);
-#ifdef SQLITE_ENABLE_NORMALIZE
-void *sqlite3HashFindN(const Hash *pH, const char *pKey, int nKey);
-#endif
 void sqlite3HashClear(Hash*);
 
 /*
diff --git a/src/prepare.c b/src/prepare.c
index 86afac5350..7ac96a68f6 100644
--- a/src/prepare.c
+++ b/src/prepare.c
@@ -728,27 +728,41 @@ static int shouldTreatAsIdentifier(
   Hash *pHash;        /* Hash table of tables for current database. */
   HashElem *e;        /* Hash element for hash table iteration. */
   Table *pTab;        /* Database table for columns being checked. */
+  char *zId;          /* Zero terminated name of the identifier */
+  char zSpace[50];    /* Static space for the zero-terminated name */
 
-  if( sqlite3IsRowidN(zToken, nToken) ){
-    return 1;
+  if( nToken<sizeof(zSpace) ){
+    memcpy(zSpace, zToken, nToken);
+    zSpace[nToken] = 0;
+    zId = zSpace;
+  }else{
+    zId = sqlite3DbStrNDup(db, zToken, nToken);
+    if( zId==0 ) return 0;
+  }
+  if( sqlite3IsRowid(zId) ){
+    bFound = 1;
+    goto done;
   }
   if( nToken>0 ){
     int hash = SQLITE_FUNC_HASH(sqlite3UpperToLower[(u8)zToken[0]], nToken);
-    if( sqlite3FunctionSearchN(hash, zToken, nToken) ) return 1;
+    if( sqlite3FunctionSearch(hash, zId) ){
+      bFound = 1;
+      goto done;
+    }
   }
   assert( db!=0 );
   sqlite3_mutex_enter(db->mutex);
   sqlite3BtreeEnterAll(db);
   for(i=0; i<db->nDb; i++){
     pHash = &db->aFunc;
-    if( sqlite3HashFindN(pHash, zToken, nToken) ){
+    if( sqlite3HashFind(pHash, zId) ){
       bFound = 1;
       break;
     }
     pSchema = db->aDb[i].pSchema;
     if( pSchema==0 ) continue;
     pHash = &pSchema->tblHash;
-    if( sqlite3HashFindN(pHash, zToken, nToken) ){
+    if( sqlite3HashFind(pHash, zId) ){
       bFound = 1;
       break;
     }
@@ -770,7 +784,7 @@ static int shouldTreatAsIdentifier(
           goto done;
         }
       }
-      if( pHash && sqlite3HashFindN(pHash, zToken, nToken) ){
+      if( pHash && sqlite3HashFind(pHash, zId) ){
         bFound = 1;
         goto done;
       }
@@ -779,6 +793,7 @@ static int shouldTreatAsIdentifier(
 done:
   sqlite3BtreeLeaveAll(db);
   sqlite3_mutex_leave(db->mutex);
+  if( zId!=zSpace ) sqlite3DbFree(db, zId);
   return bFound;
 }
 
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index fc52fecfe2..9373accf8d 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -4056,9 +4056,7 @@ ExprList *sqlite3ExprListDup(sqlite3*,ExprList*,int);
 SrcList *sqlite3SrcListDup(sqlite3*,SrcList*,int);
 IdList *sqlite3IdListDup(sqlite3*,IdList*);
 Select *sqlite3SelectDup(sqlite3*,Select*,int);
-#ifdef SQLITE_ENABLE_NORMALIZE
-FuncDef *sqlite3FunctionSearchN(int,const char*,int);
-#endif
+FuncDef *sqlite3FunctionSearch(int,const char*);
 void sqlite3InsertBuiltinFuncs(FuncDef*,int);
 FuncDef *sqlite3FindFunction(sqlite3*,const char*,int,u8,u8);
 void sqlite3RegisterBuiltinFunctions(void);