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Overview
Comment:Enhance the sqlite3ExprCompare() routine so that it knows to compare the OVER clause of window functions.
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SHA3-256: 0a7649afebc9349bf44a0e3588e81ab595ea85be1c70de08859ea76a7b271f62
User & Date: drh 2018-07-10 06:47:07
Context
2018-07-10
07:25
Assert that if two functions compare equal in every other way, then they must both have OVER clauses, or neither has an OVER clause. Use this fact to simplify expression comparison. check-in: 52559ad5 user: drh tags: trunk
06:47
Enhance the sqlite3ExprCompare() routine so that it knows to compare the OVER clause of window functions. check-in: 0a7649af user: drh tags: trunk
06:32
Enhance the TreeView mechanism so that it shows the window function data structures as part of the abstract syntax tree. check-in: a2c0e1be user: drh tags: trunk
Changes
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Changes to src/expr.c.

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    if( sqlite3ExprListCompare(pA->x.pList, pB->x.pList, iTab) ) return 2;
    assert( (combinedFlags & EP_Reduced)==0 );
    if( pA->op!=TK_STRING && pA->op!=TK_TRUEFALSE ){
      if( pA->iColumn!=pB->iColumn ) return 2;
      if( pA->iTable!=pB->iTable 
       && (pA->iTable!=iTab || NEVER(pB->iTable>=0)) ) return 2;
    }








  }
  return 0;
}

/*
** Compare two ExprList objects.  Return 0 if they are identical and 
** non-zero if they differ in any way.







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    if( sqlite3ExprListCompare(pA->x.pList, pB->x.pList, iTab) ) return 2;
    assert( (combinedFlags & EP_Reduced)==0 );
    if( pA->op!=TK_STRING && pA->op!=TK_TRUEFALSE ){
      if( pA->iColumn!=pB->iColumn ) return 2;
      if( pA->iTable!=pB->iTable 
       && (pA->iTable!=iTab || NEVER(pB->iTable>=0)) ) return 2;
    }
#ifndef SQLITE_OMIT_WINDOWFUNC
    if( pA->pWin!=0 ){
      if( pB->pWin==0 ) return 2;
      if( sqlite3WindowCompare(pParse,pA->pWin,pB->pWin)!=0 ) return 2;
    }else if( pB->pWin!=0 ){
      return 2;
    }
#endif
  }
  return 0;
}

/*
** Compare two ExprList objects.  Return 0 if they are identical and 
** non-zero if they differ in any way.