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Comment additions in parser.

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This commit is contained in:
Bruce Momjian 2001-05-19 01:57:11 +00:00
parent 5e987038ce
commit 385d271b81
1 changed files with 9 additions and 5 deletions
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14
src/backend/parser/parse_func.c
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@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.107 2001/05/19 00:37:45 momjian Exp $ * $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.108 2001/05/19 01:57:11 momjian Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -106,6 +106,7 @@ ParseNestedFuncOrColumn(ParseState *pstate, Attr *attr, int precedence)
/* /*
* parse function * parse function
*
* This code is confusing because the database can accept * This code is confusing because the database can accept
* relation.column, column.function, or relation.column.function. * relation.column, column.function, or relation.column.function.
* In these cases, funcname is the last parameter, and fargs are * 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 * In this case, Funcname is the part before parens, and fargs
* are the part in parens. * are the part in parens.
* *
* FYI, projection is choosing column from a table.
*
*/ */
Node * Node *
ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs, 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 * Most of the rest of the parser just assumes that functions do
* not have more than FUNC_MAX_ARGS parameters. We have to test * 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) if (nargs > FUNC_MAX_ARGS)
elog(ERROR, "Cannot pass more than %d arguments to a function", 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 * check for projection methods: if function takes one argument, and
* that argument is a relation, param, or PQ function returning a * that argument is a relation, param, or PQ function returning a
* complex * type, then the function could be a projection. * 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; 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; refname = ident->name;
retval = qualifiedNameToVar(pstate, refname, funcname, true); retval = qualifiedNameToVar(pstate, refname, funcname, true);