SQLite

  u8 op,                /* Comparison operator */
  u8 p5                 /* SQLITE_NULLEQ or zero */
){
  Vdbe *v = pParse->pVdbe;
  Expr *pLeft = pExpr->pLeft;
  Expr *pRight = pExpr->pRight;
  int nLeft = sqlite3ExprVectorSize(pLeft);







    int i;
    int regLeft = 0;
    int regRight = 0;
    u8 opx = op;
    int addrDone = sqlite3VdbeMakeLabel(v);

  assert( nLeft==sqlite3ExprVectorSize(pRight) );
    assert( pExpr->op==TK_EQ || pExpr->op==TK_NE 
         || pExpr->op==TK_IS || pExpr->op==TK_ISNOT 
         || pExpr->op==TK_LT || pExpr->op==TK_GT 
         || pExpr->op==TK_LE || pExpr->op==TK_GE 
    );
    assert( pExpr->op==op || (pExpr->op==TK_IS && op==TK_EQ)
              || (pExpr->op==TK_ISNOT && op==TK_NE) );

        VdbeCoverageIf(v, op==TK_LE);
        VdbeCoverageIf(v, op==TK_GE);
        if( i==nLeft-2 ) opx = op;
      }
    }
    sqlite3VdbeResolveLabel(v, addrDone);
  }


#if SQLITE_MAX_EXPR_DEPTH>0
/*
** Check that argument nHeight is less than or equal to the maximum
** expression depth allowed. If it is not, leave an error message in
** pParse.
*/

        }
      }
      break;
    }
    case TK_VARIABLE: {
      notValid(pParse, pNC, "parameters", NC_IsCheck|NC_PartIdx|NC_IdxExpr);
      break;
    }
    case TK_EQ:
    case TK_NE:
    case TK_LT:
    case TK_LE:
    case TK_GT:
    case TK_GE:
    case TK_IS:
    case TK_ISNOT: {
      int nLeft, nRight;
      if( pParse->db->mallocFailed ) break;
      assert( pExpr->pRight!=0 );
      assert( pExpr->pLeft!=0 );
      nLeft = sqlite3ExprVectorSize(pExpr->pLeft);
      nRight = sqlite3ExprVectorSize(pExpr->pRight);
      if( nLeft!=nRight ){
        testcase( pExpr->op==TK_EQ );
        testcase( pExpr->op==TK_NE );
        testcase( pExpr->op==TK_LT );
        testcase( pExpr->op==TK_LE );
        testcase( pExpr->op==TK_GT );
        testcase( pExpr->op==TK_GE );
        testcase( pExpr->op==TK_IS );
        testcase( pExpr->op==TK_ISNOT );
        sqlite3ErrorMsg(pParse, "row value misused");
      }
      break; 
    }
  }
  return (pParse->nErr || pParse->db->mallocFailed) ? WRC_Abort : WRC_Continue;
}

/*
** pEList is a list of expressions which are really the result set of the

  if( pWC->op==TK_AND 
  && (pExpr->op==TK_EQ || pExpr->op==TK_IS)
  && sqlite3ExprIsVector(pExpr->pLeft)
  && ( (pExpr->pLeft->flags & EP_xIsSelect)==0 
    || (pExpr->pRight->flags & EP_xIsSelect)==0
  )){
    int nLeft = sqlite3ExprVectorSize(pExpr->pLeft);

      int i;
    assert( nLeft==sqlite3ExprVectorSize(pExpr->pRight) );
    for(i=0; i<nLeft; i++){
        int idxNew;
        Expr *pNew;
        Expr *pLeft = sqlite3ExprForVectorField(pParse, pExpr->pLeft, i);
        Expr *pRight = sqlite3ExprForVectorField(pParse, pExpr->pRight, i);

        pNew = sqlite3PExpr(pParse, pExpr->op, pLeft, pRight, 0);
        idxNew = whereClauseInsert(pWC, pNew, TERM_DYNAMIC);
        exprAnalyze(pSrc, pWC, idxNew);
      }
      pTerm = &pWC->a[idxTerm];
      pTerm->wtFlags = TERM_CODED|TERM_VIRTUAL;  /* Disable the original */
      pTerm->eOperator = 0;
    }


  /* If there is a vector IN term - e.g. "(a, b) IN (SELECT ...)" - create
  ** a virtual term for each vector component. The expression object
  ** used by each such virtual term is pExpr (the full vector IN(...) 
  ** expression). The WhereTerm.iField variable identifies the index within
  ** the vector on the LHS that the virtual term represents.  */
  if( pWC->op==TK_AND && pExpr->op==TK_IN && pTerm->iField==0

  CREATE TABLE t3(a TEXT,b TEXT,c TEXT,d TEXT,e TEXT,f TEXT);
  CREATE INDEX t3x ON t3(b,c,d,e,f);

  SELECT a FROM t3
    WHERE (c,d) IN (SELECT 'c','d' FROM dual)
    AND (a,b,e) IN (SELECT 'a','b','d' FROM dual);
}

do_catchsql_test 11.1 {
  CREATE TABLE t11(a);
  SELECT * FROM t11 WHERE (a,a)<=1;
} {1 {row value misused}}
do_catchsql_test 11.2 {
  SELECT * FROM t11 WHERE (a,a)<1;
} {1 {row value misused}}
do_catchsql_test 11.3 {
  SELECT * FROM t11 WHERE (a,a)>=1;
} {1 {row value misused}}
do_catchsql_test 11.4 {
  SELECT * FROM t11 WHERE (a,a)>1;
} {1 {row value misused}}
do_catchsql_test 11.5 {
  SELECT * FROM t11 WHERE (a,a)==1;
} {1 {row value misused}}
do_catchsql_test 11.6 {
  SELECT * FROM t11 WHERE (a,a)<>1;
} {1 {row value misused}}
do_catchsql_test 11.7 {
  SELECT * FROM t11 WHERE (a,a) IS 1;
} {1 {row value misused}}
do_catchsql_test 11.8 {
  SELECT * FROM t11 WHERE (a,a) IS NOT 1;
} {1 {row value misused}}


finish_test

  CREATE TABLE c3(d);
}
do_catchsql_test 8.2 {
  SELECT * FROM c2 CROSS JOIN c3 WHERE 
    ( (a, b) == (SELECT x, y FROM c1) AND c3.d = c ) OR
    ( c == (SELECT x, y FROM c1) AND c3.d = c )
} {1 {row value misused}}

finish_test

} {3 4}

# Try a select with more than one result column.
#
do_test subselect-1.2 {
  set v [catch {execsql {SELECT * FROM t1 WHERE a = (SELECT * FROM t1)}} msg]
  lappend v $msg
} {1 {row value misused}}

# A subselect without an aggregate.
#
do_test subselect-1.3a {
  execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=2)}
} {2}
do_test subselect-1.3b {