/*
* transformTargetEntry()
* Transform any ordinary "expression-type" node into a targetlist entry.
* This is exported so that parse_clause.c can generate targetlist entries
* for ORDER/GROUP BY items that are not already in the targetlist.
*
* node the (untransformed) parse tree for the value expression.
* expr the transformed expression, or NULL if caller didn't do it yet.
* colname the column name to be assigned, or NULL if none yet set.
* resjunk true if the target should be marked resjunk, ie, it is not
* wanted in the final projected tuple.
*/
TargetEntry *
transformTargetEntry(ParseState *pstate,
Node *node,
Node *expr,
char *colname,
bool resjunk)
{
/* Transform the node if caller didn't do it already */
if (expr == NULL)
expr = transformExpr(pstate, node);
if (colname == NULL && !resjunk)
{
/*
* Generate a suitable column name for a column without any explicit
* 'AS ColumnName' clause.
*/
colname = FigureColname(node);
}
return makeTargetEntry((Expr *) expr,
(AttrNumber) pstate->p_next_resno++,
colname,
resjunk);
}
/*
* add_coltypes
*
* Given a target list, add the types the entries to a list of types seen
* for the same column across all streams
*/
static void
add_coltypes(StreamTargetsEntry *stream, List *targetlist)
{
ListCell *lc;
foreach(lc, targetlist)
{
bool found;
TypeCast *tc = (TypeCast *) lfirst(lc);
StreamColumnsEntry *entry;
char *name = FigureColname((Node *) tc);
entry = (StreamColumnsEntry *) hash_search(stream->colstotypes, name, HASH_ENTER, &found);
if (!found)
entry->types = NIL;
entry->types = lappend(entry->types, tc);
}
/*
* xfrm_tgt_entry()
* Transform any ordinary "expression-type" node into a targetlist entry.
* This is exported so that parse_clause.c can generate targetlist entries
* for ORDER/GROUP BY items that are not already in the targetlist.
*
* node the (untransformed) parse tree for the value expression.
* expr the transformed expression, or NULL if caller didn't do it yet.
* colname the column name to be assigned, or NULL if none yet set.
* resjunk true if the target should be marked resjunk, ie, it is not
* wanted in the final projected tuple.
*/
tgt_entry_xp*
xfrm_tgt_entry(
parse_state_s* pstate,
node_n* node,
node_n* expr,
char* colname,
bool resjunk)
{
/* Transform the node if caller didn't do it already */
if (expr == NULL)
expr = xfrm_expr(pstate, node);
if (colname == NULL && !resjunk) {
/*
* Generate a suitable column name for a column without any explicit
* 'AS ColumnName' clause.
*/
colname = FigureColname(node);
}
return makeTargetEntry((expr_n*) expr, (attr_nr_t) pstate->p_next_resno++, colname, resjunk);
}