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New comment. This func/column things has always confused me.

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/*
 *  parse function
 *  This code is confusing because the database can accept
 *  relation.column, column.function, or relation.column.function.
 *  In these cases, funcname is the last parameter, and fargs are
 *  the rest.
 *
 *  It can also be called as func(col) or func(col,col).
 *  In this case, Funcname is the part before parens, and fargs
 *  are the part in parens.
 *
 */
Node *
ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
                  bool agg_star, bool agg_distinct,
                  int precedence)
This commit is contained in:
Bruce Momjian
2001-05-19 00:33:20 +00:00
parent f61d70c2ac
commit 5ec8474323
3 changed files with 20 additions and 16 deletions
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8
src/backend/parser/parse_expr.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_expr.c,v 1.94 2001/05/18 22:35:50 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_expr.c,v 1.95 2001/05/19 00:33:20 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -173,7 +173,7 @@ transformExpr(ParseState *pstate, Node *expr, int precedence)
a->lexpr,
precedence);
result = ParseColumnOrFunc(pstate,
result = ParseFuncOrColumn(pstate,
"nullvalue",
makeList1(lexpr),
false, false,
@@ -186,7 +186,7 @@ transformExpr(ParseState *pstate, Node *expr, int precedence)
a->lexpr,
precedence);
result = ParseColumnOrFunc(pstate,
result = ParseFuncOrColumn(pstate,
"nonnullvalue",
makeList1(lexpr),
false, false,
@@ -273,7 +273,7 @@ transformExpr(ParseState *pstate, Node *expr, int precedence)
lfirst(args) = transformExpr(pstate,
(Node *) lfirst(args),
precedence);
result = ParseColumnOrFunc(pstate,
result = ParseFuncOrColumn(pstate,
fn->funcname,
fn->args,
fn->agg_star,