1: # include   "../ingres.h"
   2: # include   "../symbol.h"
   3: # include   "../tree.h"
   4: # include   "decomp.h"
   5: 
   6: 
   7: mk_unique(root)
   8: struct querytree    *root;
   9: 
  10: /*
  11: **	create a result relation for a ret_unique
  12: */
  13: 
  14: {
  15:     register int            i, domcnt;
  16:     register struct querytree   *r;
  17: 
  18:     r = root;
  19: 
  20:     /* verify that target list is within range */
  21:     domcnt = r->left->sym.type != TREE ? ((struct qt_res *)r->left)->resno : 0;
  22:     if (findwid(r) > MAXTUP || domcnt > MAXDOM)
  23:         derror(4620);
  24:     i = MAXRANGE - 1;
  25:     Rangev[i].relnum = mak_t_rel(r, "u", -1);
  26:     Resultvar = i;
  27: 
  28:     /* don't count retrieve into portion as a user query */
  29:     ((struct qt_root *)r)->rootuser = 0;
  30: }
  31: 
  32: 
  33: pr_unique(root1, var1)
  34: struct querytree    *root1;
  35: int         var1;
  36: 
  37: /*
  38: **	Retrieve all domains of the variable "var".
  39: **	This routine is used for ret_unique to retrieve
  40: **	the result relation. First duplicates are removed
  41: **	then the original tree is converted to be a
  42: **	retrieve of all domains of "var", and then
  43: **	ovqp is called to retrieve the relation.
  44: */
  45: 
  46: {
  47:     register struct querytree   *root, *r;
  48:     register int            var;
  49:     extern struct querytree     *makavar();
  50: 
  51:     root = root1;
  52:     var = var1;
  53: 
  54:     /* remove duplicates from the unopened relation */
  55:     removedups(var);
  56: 
  57:     /* remove the qual from the tree */
  58:     root->right = Qle;
  59: 
  60:     /* make all resdoms refer to the result relation */
  61:     for (r = root->left; r->sym.type != TREE; r = r->left)
  62:         r->right = makavar(r, var, ((struct qt_res *)r)->resno);
  63: 
  64:     /* count as a user query */
  65:     ((struct qt_root *)root)->rootuser = TRUE;
  66: 
  67:     /* run the retrieve */
  68:     Sourcevar = var;
  69:     Newq = Newr = TRUE;
  70:     call_ovqp(root, mdRETR, NORESULT);
  71: }

Defined functions

mk_unique defined in line 7; used 1 times
pr_unique defined in line 33; used 1 times
Last modified: 1995-04-14
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