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体验新版 GitCode,发现更多精彩内容 >>
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385d271b
编写于
5月 19, 2001
作者:
B
Bruce Momjian
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差异文件
Comment additions in parser.
上级
5e987038
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
9 addition
and
5 deletion
+9
-5
src/backend/parser/parse_func.c
src/backend/parser/parse_func.c
+9
-5
未找到文件。
src/backend/parser/parse_func.c
浏览文件 @
385d271b
...
...
@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.10
7 2001/05/19 00:37:45
momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.10
8 2001/05/19 01:57:11
momjian Exp $
*
*-------------------------------------------------------------------------
*/
...
...
@@ -106,6 +106,7 @@ ParseNestedFuncOrColumn(ParseState *pstate, Attr *attr, int precedence)
/*
* 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
...
...
@@ -115,6 +116,8 @@ ParseNestedFuncOrColumn(ParseState *pstate, Attr *attr, int precedence)
* In this case, Funcname is the part before parens, and fargs
* are the part in parens.
*
* FYI, projection is choosing column from a table.
*
*/
Node
*
ParseFuncOrColumn
(
ParseState
*
pstate
,
char
*
funcname
,
List
*
fargs
,
...
...
@@ -144,7 +147,8 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
/*
* Most of the rest of the parser just assumes that functions do
* not have more than FUNC_MAX_ARGS parameters. We have to test
* here to protect against array overruns, etc.
* here to protect against array overruns, etc. Of course, this
* may not be a function, but the test doesn't hurt.
*/
if
(
nargs
>
FUNC_MAX_ARGS
)
elog
(
ERROR
,
"Cannot pass more than %d arguments to a function"
,
...
...
@@ -158,6 +162,8 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
}
/*
* test for relation.column
*
* check for projection methods: if function takes one argument, and
* that argument is a relation, param, or PQ function returning a
* complex * type, then the function could be a projection.
...
...
@@ -170,9 +176,7 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
{
Ident
*
ident
=
(
Ident
*
)
first_arg
;
/*
* first arg is a relation. This could be a projection.
*/
/* First arg is a relation. This could be a projection. */
refname
=
ident
->
name
;
retval
=
qualifiedNameToVar
(
pstate
,
refname
,
funcname
,
true
);
...
...
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