src/treeview.c

   1 /*
   2 ** 2015-06-08
   3 **
   4 ** The author disclaims copyright to this source code.  In place of
   5 ** a legal notice, here is a blessing:
   6 **
   7 **    May you do good and not evil.
   8 **    May you find forgiveness for yourself and forgive others.
   9 **    May you share freely, never taking more than you give.
  10 **
  11 *************************************************************************
  12 **
  13 ** This file contains C code to implement the TreeView debugging routines.
  14 ** These routines print a parse tree to standard output for debugging and
  15 ** analysis.
  16 **
  17 ** The interfaces in this file is only available when compiling
  18 ** with SQLITE_DEBUG.
  19 */
  20 #include "sqliteInt.h"
  21 #ifdef SQLITE_DEBUG
  22
  23 /*
  24 ** Add a new subitem to the tree.  The moreToFollow flag indicates that this
  25 ** is not the last item in the tree.
  26 */
  27 static TreeView *sqlite3TreeViewPush(TreeView *p, u8 moreToFollow){
  28   if( p==0 ){
  29     p = sqlite3_malloc64( sizeof(*p) );
  30     if( p==0 ) return 0;
  31     memset(p, 0, sizeof(*p));
  32   }else{
  33     p->iLevel++;
  34   }
  35   assert( moreToFollow==0 || moreToFollow==1 );
  36   if( p->iLevel<sizeof(p->bLine) ) p->bLine[p->iLevel] = moreToFollow;
  37   return p;
  38 }
  39
  40 /*
  41 ** Finished with one layer of the tree
  42 */
  43 static void sqlite3TreeViewPop(TreeView *p){
  44   if( p==0 ) return;
  45   p->iLevel--;
  46   if( p->iLevel<0 ) sqlite3_free(p);
  47 }
  48
  49 /*
  50 ** Generate a single line of output for the tree, with a prefix that contains
  51 ** all the appropriate tree lines
  52 */
  53 static void sqlite3TreeViewLine(TreeView *p, const char *zFormat, ...){
  54   va_list ap;
  55   int i;
  56   StrAccum acc;
  57   char zBuf[500];
  58   sqlite3StrAccumInit(&acc, 0, zBuf, sizeof(zBuf), 0);
  59   if( p ){
  60     for(i=0; i<p->iLevel && i<sizeof(p->bLine)-1; i++){
  61       sqlite3StrAccumAppend(&acc, p->bLine[i] ? "|   " : "    ", 4);
  62     }
  63     sqlite3StrAccumAppend(&acc, p->bLine[i] ? "|-- " : "'-- ", 4);
  64   }
  65   va_start(ap, zFormat);
  66   sqlite3VXPrintf(&acc, zFormat, ap);
  67   va_end(ap);
  68   assert( acc.nChar>0 );
  69   if( zBuf[acc.nChar-1]!='\n' ) sqlite3StrAccumAppend(&acc, "\n", 1);
  70   sqlite3StrAccumFinish(&acc);
  71   fprintf(stdout,"%s", zBuf);
  72   fflush(stdout);
  73 }
  74
  75 /*
  76 ** Shorthand for starting a new tree item that consists of a single label
  77 */
  78 static void sqlite3TreeViewItem(TreeView *p, const char *zLabel,u8 moreFollows){
  79   p = sqlite3TreeViewPush(p, moreFollows);
  80   sqlite3TreeViewLine(p, "%s", zLabel);
  81 }
  82
  83 /*
  84 ** Generate a human-readable description of a WITH clause.
  85 */
  86 void sqlite3TreeViewWith(TreeView *pView, const With *pWith, u8 moreToFollow){
  87   int i;
  88   if( pWith==0 ) return;
  89   if( pWith->nCte==0 ) return;
  90   if( pWith->pOuter ){
  91     sqlite3TreeViewLine(pView, "WITH (0x%p, pOuter=0x%p)",pWith,pWith->pOuter);
  92   }else{
  93     sqlite3TreeViewLine(pView, "WITH (0x%p)", pWith);
  94   }
  95   if( pWith->nCte>0 ){
  96     pView = sqlite3TreeViewPush(pView, 1);
  97     for(i=0; i<pWith->nCte; i++){
  98       StrAccum x;
  99       char zLine[1000];
 100       const struct Cte *pCte = &pWith->a[i];
 101       sqlite3StrAccumInit(&x, 0, zLine, sizeof(zLine), 0);
 102       sqlite3XPrintf(&x, "%s", pCte->zName);
 103       if( pCte->pCols && pCte->pCols->nExpr>0 ){
 104         char cSep = '(';
 105         int j;
 106         for(j=0; j<pCte->pCols->nExpr; j++){
 107           sqlite3XPrintf(&x, "%c%s", cSep, pCte->pCols->a[j].zName);
 108           cSep = ',';
 109         }
 110         sqlite3XPrintf(&x, ")");
 111       }
 112       sqlite3XPrintf(&x, " AS");
 113       sqlite3StrAccumFinish(&x);
 114       sqlite3TreeViewItem(pView, zLine, i<pWith->nCte-1);
 115       sqlite3TreeViewSelect(pView, pCte->pSelect, 0);
 116       sqlite3TreeViewPop(pView);
 117     }
 118     sqlite3TreeViewPop(pView);
 119   }
 120 }
 121
 122
 123 /*
 124 ** Generate a human-readable description of a Select object.
 125 */
 126 void sqlite3TreeViewSelect(TreeView *pView, const Select *p, u8 moreToFollow){
 127   int n = 0;
 128   int cnt = 0;
 129   if( p==0 ){
 130     sqlite3TreeViewLine(pView, "nil-SELECT");
 131     return;
 132   }
 133   pView = sqlite3TreeViewPush(pView, moreToFollow);
 134   if( p->pWith ){
 135     sqlite3TreeViewWith(pView, p->pWith, 1);
 136     cnt = 1;
 137     sqlite3TreeViewPush(pView, 1);
 138   }
 139   do{
 140 #if SELECTTRACE_ENABLED
 141     sqlite3TreeViewLine(pView,
 142       "SELECT%s%s (%s/%d/%p) selFlags=0x%x nSelectRow=%d",
 143       ((p->selFlags & SF_Distinct) ? " DISTINCT" : ""),
 144       ((p->selFlags & SF_Aggregate) ? " agg_flag" : ""),
 145       p->zSelName, p->iSelectId, p, p->selFlags,
 146       (int)p->nSelectRow
 147     );
 148 #else
 149     sqlite3TreeViewLine(pView, "SELECT%s%s (0x%p) selFlags=0x%x nSelectRow=%d",
 150       ((p->selFlags & SF_Distinct) ? " DISTINCT" : ""),
 151       ((p->selFlags & SF_Aggregate) ? " agg_flag" : ""), p, p->selFlags,
 152       (int)p->nSelectRow
 153     );
 154 #endif
 155     if( cnt++ ) sqlite3TreeViewPop(pView);
 156     if( p->pPrior ){
 157       n = 1000;
 158     }else{
 159       n = 0;
 160       if( p->pSrc && p->pSrc->nSrc ) n++;
 161       if( p->pWhere ) n++;
 162       if( p->pGroupBy ) n++;
 163       if( p->pHaving ) n++;
 164       if( p->pOrderBy ) n++;
 165       if( p->pLimit ) n++;
 166     }
 167     sqlite3TreeViewExprList(pView, p->pEList, (n--)>0, "result-set");
 168     if( p->pSrc && p->pSrc->nSrc ){
 169       int i;
 170       pView = sqlite3TreeViewPush(pView, (n--)>0);
 171       sqlite3TreeViewLine(pView, "FROM");
 172       for(i=0; i<p->pSrc->nSrc; i++){
 173         struct SrcList_item *pItem = &p->pSrc->a[i];
 174         StrAccum x;
 175         char zLine[100];
 176         sqlite3StrAccumInit(&x, 0, zLine, sizeof(zLine), 0);
 177         sqlite3XPrintf(&x, "{%d,*}", pItem->iCursor);
 178         if( pItem->zDatabase ){
 179           sqlite3XPrintf(&x, " %s.%s", pItem->zDatabase, pItem->zName);
 180         }else if( pItem->zName ){
 181           sqlite3XPrintf(&x, " %s", pItem->zName);
 182         }
 183         if( pItem->pTab ){
 184           sqlite3XPrintf(&x, " tabname=%Q", pItem->pTab->zName);
 185         }
 186         if( pItem->zAlias ){
 187           sqlite3XPrintf(&x, " (AS %s)", pItem->zAlias);
 188         }
 189         if( pItem->fg.jointype & JT_LEFT ){
 190           sqlite3XPrintf(&x, " LEFT-JOIN");
 191         }
 192         sqlite3StrAccumFinish(&x);
 193         sqlite3TreeViewItem(pView, zLine, i<p->pSrc->nSrc-1);
 194         if( pItem->pSelect ){
 195           sqlite3TreeViewSelect(pView, pItem->pSelect, 0);
 196         }
 197         if( pItem->fg.isTabFunc ){
 198           sqlite3TreeViewExprList(pView, pItem->u1.pFuncArg, 0, "func-args:");
 199         }
 200         sqlite3TreeViewPop(pView);
 201       }
 202       sqlite3TreeViewPop(pView);
 203     }
 204     if( p->pWhere ){
 205       sqlite3TreeViewItem(pView, "WHERE", (n--)>0);
 206       sqlite3TreeViewExpr(pView, p->pWhere, 0);
 207       sqlite3TreeViewPop(pView);
 208     }
 209     if( p->pGroupBy ){
 210       sqlite3TreeViewExprList(pView, p->pGroupBy, (n--)>0, "GROUPBY");
 211     }
 212     if( p->pHaving ){
 213       sqlite3TreeViewItem(pView, "HAVING", (n--)>0);
 214       sqlite3TreeViewExpr(pView, p->pHaving, 0);
 215       sqlite3TreeViewPop(pView);
 216     }
 217     if( p->pOrderBy ){
 218       sqlite3TreeViewExprList(pView, p->pOrderBy, (n--)>0, "ORDERBY");
 219     }
 220     if( p->pLimit ){
 221       sqlite3TreeViewItem(pView, "LIMIT", (n--)>0);
 222       sqlite3TreeViewExpr(pView, p->pLimit->pLeft, p->pLimit->pRight!=0);
 223       if( p->pLimit->pRight ){
 224         sqlite3TreeViewItem(pView, "OFFSET", (n--)>0);
 225         sqlite3TreeViewExpr(pView, p->pLimit->pRight, 0);
 226         sqlite3TreeViewPop(pView);
 227       }
 228       sqlite3TreeViewPop(pView);
 229     }
 230     if( p->pPrior ){
 231       const char *zOp = "UNION";
 232       switch( p->op ){
 233         case TK_ALL:         zOp = "UNION ALL";  break;
 234         case TK_INTERSECT:   zOp = "INTERSECT";  break;
 235         case TK_EXCEPT:      zOp = "EXCEPT";     break;
 236       }
 237       sqlite3TreeViewItem(pView, zOp, 1);
 238     }
 239     p = p->pPrior;
 240   }while( p!=0 );
 241   sqlite3TreeViewPop(pView);
 242 }
 243
 244 /*
 245 ** Generate a human-readable explanation of an expression tree.
 246 */
 247 void sqlite3TreeViewExpr(TreeView *pView, const Expr *pExpr, u8 moreToFollow){
 248   const char *zBinOp = 0;   /* Binary operator */
 249   const char *zUniOp = 0;   /* Unary operator */
 250   char zFlgs[60];
 251   pView = sqlite3TreeViewPush(pView, moreToFollow);
 252   if( pExpr==0 ){
 253     sqlite3TreeViewLine(pView, "nil");
 254     sqlite3TreeViewPop(pView);
 255     return;
 256   }
 257   if( pExpr->flags ){
 258     if( ExprHasProperty(pExpr, EP_FromJoin) ){
 259       sqlite3_snprintf(sizeof(zFlgs),zFlgs,"  flags=0x%x iRJT=%d",
 260                        pExpr->flags, pExpr->iRightJoinTable);
 261     }else{
 262       sqlite3_snprintf(sizeof(zFlgs),zFlgs,"  flags=0x%x",pExpr->flags);
 263     }
 264   }else{
 265     zFlgs[0] = 0;
 266   }
 267   switch( pExpr->op ){
 268     case TK_AGG_COLUMN: {
 269       sqlite3TreeViewLine(pView, "AGG{%d:%d}%s",
 270             pExpr->iTable, pExpr->iColumn, zFlgs);
 271       break;
 272     }
 273     case TK_COLUMN: {
 274       if( pExpr->iTable<0 ){
 275         /* This only happens when coding check constraints */
 276         sqlite3TreeViewLine(pView, "COLUMN(%d)%s", pExpr->iColumn, zFlgs);
 277       }else{
 278         sqlite3TreeViewLine(pView, "{%d:%d}%s",
 279                              pExpr->iTable, pExpr->iColumn, zFlgs);
 280       }
 281       break;
 282     }
 283     case TK_INTEGER: {
 284       if( pExpr->flags & EP_IntValue ){
 285         sqlite3TreeViewLine(pView, "%d", pExpr->u.iValue);
 286       }else{
 287         sqlite3TreeViewLine(pView, "%s", pExpr->u.zToken);
 288       }
 289       break;
 290     }
 291 #ifndef SQLITE_OMIT_FLOATING_POINT
 292     case TK_FLOAT: {
 293       sqlite3TreeViewLine(pView,"%s", pExpr->u.zToken);
 294       break;
 295     }
 296 #endif
 297     case TK_STRING: {
 298       sqlite3TreeViewLine(pView,"%Q", pExpr->u.zToken);
 299       break;
 300     }
 301     case TK_NULL: {
 302       sqlite3TreeViewLine(pView,"NULL");
 303       break;
 304     }
 305     case TK_TRUEFALSE: {
 306       sqlite3TreeViewLine(pView,
 307          sqlite3ExprTruthValue(pExpr) ? "TRUE" : "FALSE");
 308       break;
 309     }
 310 #ifndef SQLITE_OMIT_BLOB_LITERAL
 311     case TK_BLOB: {
 312       sqlite3TreeViewLine(pView,"%s", pExpr->u.zToken);
 313       break;
 314     }
 315 #endif
 316     case TK_VARIABLE: {
 317       sqlite3TreeViewLine(pView,"VARIABLE(%s,%d)",
 318                           pExpr->u.zToken, pExpr->iColumn);
 319       break;
 320     }
 321     case TK_REGISTER: {
 322       sqlite3TreeViewLine(pView,"REGISTER(%d)", pExpr->iTable);
 323       break;
 324     }
 325     case TK_ID: {
 326       sqlite3TreeViewLine(pView,"ID \"%w\"", pExpr->u.zToken);
 327       break;
 328     }
 329 #ifndef SQLITE_OMIT_CAST
 330     case TK_CAST: {
 331       /* Expressions of the form:   CAST(pLeft AS token) */
 332       sqlite3TreeViewLine(pView,"CAST %Q", pExpr->u.zToken);
 333       sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
 334       break;
 335     }
 336 #endif /* SQLITE_OMIT_CAST */
 337     case TK_LT:      zBinOp = "LT";     break;
 338     case TK_LE:      zBinOp = "LE";     break;
 339     case TK_GT:      zBinOp = "GT";     break;
 340     case TK_GE:      zBinOp = "GE";     break;
 341     case TK_NE:      zBinOp = "NE";     break;
 342     case TK_EQ:      zBinOp = "EQ";     break;
 343     case TK_IS:      zBinOp = "IS";     break;
 344     case TK_ISNOT:   zBinOp = "ISNOT";  break;
 345     case TK_AND:     zBinOp = "AND";    break;
 346     case TK_OR:      zBinOp = "OR";     break;
 347     case TK_PLUS:    zBinOp = "ADD";    break;
 348     case TK_STAR:    zBinOp = "MUL";    break;
 349     case TK_MINUS:   zBinOp = "SUB";    break;
 350     case TK_REM:     zBinOp = "REM";    break;
 351     case TK_BITAND:  zBinOp = "BITAND"; break;
 352     case TK_BITOR:   zBinOp = "BITOR";  break;
 353     case TK_SLASH:   zBinOp = "DIV";    break;
 354     case TK_LSHIFT:  zBinOp = "LSHIFT"; break;
 355     case TK_RSHIFT:  zBinOp = "RSHIFT"; break;
 356     case TK_CONCAT:  zBinOp = "CONCAT"; break;
 357     case TK_DOT:     zBinOp = "DOT";    break;
 358
 359     case TK_UMINUS:  zUniOp = "UMINUS"; break;
 360     case TK_UPLUS:   zUniOp = "UPLUS";  break;
 361     case TK_BITNOT:  zUniOp = "BITNOT"; break;
 362     case TK_NOT:     zUniOp = "NOT";    break;
 363     case TK_ISNULL:  zUniOp = "ISNULL"; break;
 364     case TK_NOTNULL: zUniOp = "NOTNULL"; break;
 365
 366     case TK_TRUTH: {
 367       int x;
 368       const char *azOp[] = {
 369          "IS-FALSE", "IS-TRUE", "IS-NOT-FALSE", "IS-NOT-TRUE"
 370       };
 371       assert( pExpr->op2==TK_IS || pExpr->op2==TK_ISNOT );
 372       assert( pExpr->pRight );
 373       assert( pExpr->pRight->op==TK_TRUEFALSE );
 374       x = (pExpr->op2==TK_ISNOT)*2 + sqlite3ExprTruthValue(pExpr->pRight);
 375       zUniOp = azOp[x];
 376       break;
 377     }
 378
 379     case TK_SPAN: {
 380       sqlite3TreeViewLine(pView, "SPAN %Q", pExpr->u.zToken);
 381       sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
 382       break;
 383     }
 384
 385     case TK_COLLATE: {
 386       sqlite3TreeViewLine(pView, "COLLATE %Q", pExpr->u.zToken);
 387       sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
 388       break;
 389     }
 390
 391     case TK_AGG_FUNCTION:
 392     case TK_FUNCTION: {
 393       ExprList *pFarg;       /* List of function arguments */
 394       if( ExprHasProperty(pExpr, EP_TokenOnly) ){
 395         pFarg = 0;
 396       }else{
 397         pFarg = pExpr->x.pList;
 398       }
 399       if( pExpr->op==TK_AGG_FUNCTION ){
 400         sqlite3TreeViewLine(pView, "AGG_FUNCTION%d %Q",
 401                              pExpr->op2, pExpr->u.zToken);
 402       }else{
 403         sqlite3TreeViewLine(pView, "FUNCTION %Q", pExpr->u.zToken);
 404       }
 405       if( pFarg ){
 406         sqlite3TreeViewExprList(pView, pFarg, 0, 0);
 407       }
 408       break;
 409     }
 410 #ifndef SQLITE_OMIT_SUBQUERY
 411     case TK_EXISTS: {
 412       sqlite3TreeViewLine(pView, "EXISTS-expr flags=0x%x", pExpr->flags);
 413       sqlite3TreeViewSelect(pView, pExpr->x.pSelect, 0);
 414       break;
 415     }
 416     case TK_SELECT: {
 417       sqlite3TreeViewLine(pView, "SELECT-expr flags=0x%x", pExpr->flags);
 418       sqlite3TreeViewSelect(pView, pExpr->x.pSelect, 0);
 419       break;
 420     }
 421     case TK_IN: {
 422       sqlite3TreeViewLine(pView, "IN flags=0x%x", pExpr->flags);
 423       sqlite3TreeViewExpr(pView, pExpr->pLeft, 1);
 424       if( ExprHasProperty(pExpr, EP_xIsSelect) ){
 425         sqlite3TreeViewSelect(pView, pExpr->x.pSelect, 0);
 426       }else{
 427         sqlite3TreeViewExprList(pView, pExpr->x.pList, 0, 0);
 428       }
 429       break;
 430     }
 431 #endif /* SQLITE_OMIT_SUBQUERY */
 432
 433     /*
 434     **    x BETWEEN y AND z
 435     **
 436     ** This is equivalent to
 437     **
 438     **    x>=y AND x<=z
 439     **
 440     ** X is stored in pExpr->pLeft.
 441     ** Y is stored in pExpr->pList->a[0].pExpr.
 442     ** Z is stored in pExpr->pList->a[1].pExpr.
 443     */
 444     case TK_BETWEEN: {
 445       Expr *pX = pExpr->pLeft;
 446       Expr *pY = pExpr->x.pList->a[0].pExpr;
 447       Expr *pZ = pExpr->x.pList->a[1].pExpr;
 448       sqlite3TreeViewLine(pView, "BETWEEN");
 449       sqlite3TreeViewExpr(pView, pX, 1);
 450       sqlite3TreeViewExpr(pView, pY, 1);
 451       sqlite3TreeViewExpr(pView, pZ, 0);
 452       break;
 453     }
 454     case TK_TRIGGER: {
 455       /* If the opcode is TK_TRIGGER, then the expression is a reference
 456       ** to a column in the new.* or old.* pseudo-tables available to
 457       ** trigger programs. In this case Expr.iTable is set to 1 for the
 458       ** new.* pseudo-table, or 0 for the old.* pseudo-table. Expr.iColumn
 459       ** is set to the column of the pseudo-table to read, or to -1 to
 460       ** read the rowid field.
 461       */
 462       sqlite3TreeViewLine(pView, "%s(%d)",
 463           pExpr->iTable ? "NEW" : "OLD", pExpr->iColumn);
 464       break;
 465     }
 466     case TK_CASE: {
 467       sqlite3TreeViewLine(pView, "CASE");
 468       sqlite3TreeViewExpr(pView, pExpr->pLeft, 1);
 469       sqlite3TreeViewExprList(pView, pExpr->x.pList, 0, 0);
 470       break;
 471     }
 472 #ifndef SQLITE_OMIT_TRIGGER
 473     case TK_RAISE: {
 474       const char *zType = "unk";
 475       switch( pExpr->affinity ){
 476         case OE_Rollback:   zType = "rollback";  break;
 477         case OE_Abort:      zType = "abort";     break;
 478         case OE_Fail:       zType = "fail";      break;
 479         case OE_Ignore:     zType = "ignore";    break;
 480       }
 481       sqlite3TreeViewLine(pView, "RAISE %s(%Q)", zType, pExpr->u.zToken);
 482       break;
 483     }
 484 #endif
 485     case TK_MATCH: {
 486       sqlite3TreeViewLine(pView, "MATCH {%d:%d}%s",
 487                           pExpr->iTable, pExpr->iColumn, zFlgs);
 488       sqlite3TreeViewExpr(pView, pExpr->pRight, 0);
 489       break;
 490     }
 491     case TK_VECTOR: {
 492       sqlite3TreeViewBareExprList(pView, pExpr->x.pList, "VECTOR");
 493       break;
 494     }
 495     case TK_SELECT_COLUMN: {
 496       sqlite3TreeViewLine(pView, "SELECT-COLUMN %d", pExpr->iColumn);
 497       sqlite3TreeViewSelect(pView, pExpr->pLeft->x.pSelect, 0);
 498       break;
 499     }
 500     case TK_IF_NULL_ROW: {
 501       sqlite3TreeViewLine(pView, "IF-NULL-ROW %d", pExpr->iTable);
 502       sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
 503       break;
 504     }
 505     default: {
 506       sqlite3TreeViewLine(pView, "op=%d", pExpr->op);
 507       break;
 508     }
 509   }
 510   if( zBinOp ){
 511     sqlite3TreeViewLine(pView, "%s%s", zBinOp, zFlgs);
 512     sqlite3TreeViewExpr(pView, pExpr->pLeft, 1);
 513     sqlite3TreeViewExpr(pView, pExpr->pRight, 0);
 514   }else if( zUniOp ){
 515     sqlite3TreeViewLine(pView, "%s%s", zUniOp, zFlgs);
 516     sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
 517   }
 518   sqlite3TreeViewPop(pView);
 519 }
 520
 521
 522 /*
 523 ** Generate a human-readable explanation of an expression list.
 524 */
 525 void sqlite3TreeViewBareExprList(
 526   TreeView *pView,
 527   const ExprList *pList,
 528   const char *zLabel
 529 ){
 530   if( zLabel==0 || zLabel[0]==0 ) zLabel = "LIST";
 531   if( pList==0 ){
 532     sqlite3TreeViewLine(pView, "%s (empty)", zLabel);
 533   }else{
 534     int i;
 535     sqlite3TreeViewLine(pView, "%s", zLabel);
 536     for(i=0; i<pList->nExpr; i++){
 537       int j = pList->a[i].u.x.iOrderByCol;
 538       char *zName = pList->a[i].zName;
 539       if( j || zName ){
 540         sqlite3TreeViewPush(pView, 0);
 541       }
 542       if( zName ){
 543         sqlite3TreeViewLine(pView, "AS %s", zName);
 544       }
 545       if( j ){
 546         sqlite3TreeViewLine(pView, "iOrderByCol=%d", j);
 547       }
 548       sqlite3TreeViewExpr(pView, pList->a[i].pExpr, i<pList->nExpr-1);
 549       if( j || zName ){
 550         sqlite3TreeViewPop(pView);
 551       }
 552     }
 553   }
 554 }
 555 void sqlite3TreeViewExprList(
 556   TreeView *pView,
 557   const ExprList *pList,
 558   u8 moreToFollow,
 559   const char *zLabel
 560 ){
 561   pView = sqlite3TreeViewPush(pView, moreToFollow);
 562   sqlite3TreeViewBareExprList(pView, pList, zLabel);
 563   sqlite3TreeViewPop(pView);
 564 }
 565
 566 #endif /* SQLITE_DEBUG */