static void
plainnode(PLAINTREE *state, NODE *node)
{
/* since this function recurses, it could be driven to stack overflow. */
check_stack_depth();
if (state->cur == state->len)
{
state->len *= 2;
state->ptr = (QueryItem *) repalloc((void *) state->ptr, state->len * sizeof(QueryItem));
}
memcpy((void *) &(state->ptr[state->cur]), (void *) node->valnode, sizeof(QueryItem));
if (node->valnode->type == QI_VAL)
state->cur++;
else if (node->valnode->qoperator.oper == OP_NOT)
{
state->ptr[state->cur].qoperator.left = 1;
state->cur++;
plainnode(state, node->right);
}
else
{
int cur = state->cur;
state->cur++;
plainnode(state, node->right);
state->ptr[cur].qoperator.left = state->cur - cur;
plainnode(state, node->left);
}
pfree(node);
}
/*
* make plain view of tree from a NODE-tree representation
*/
static QueryItem *
plaintree(NODE *root, int *len)
{
PLAINTREE pl;
pl.cur = 0;
pl.len = 16;
if (root && (root->valnode->type == QI_VAL || root->valnode->type == QI_OPR))
{
pl.ptr = (QueryItem *) palloc(pl.len * sizeof(QueryItem));
plainnode(&pl, root);
}
else
pl.ptr = NULL;
*len = pl.cur;
return pl.ptr;
}
/*
* make plain view of tree from 'normal' view of tree
*/
static ITEM *
plaintree(NODE * root, int4 *len)
{
PLAINTREE pl;
pl.cur = 0;
pl.len = 16;
if (root && (root->valnode->type == VAL || root->valnode->type == OPR))
{
pl.ptr = (ITEM *) palloc(pl.len * sizeof(ITEM));
plainnode(&pl, root);
}
else
pl.ptr = NULL;
*len = pl.cur;
return pl.ptr;
}