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Commit4b10271

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Change get_rule_expr so that when the input is a List, it displays the
list elements comma-separated instead of barfing. This allows eliminationof half a dozen redundant copies of that behavior, and also makes theworld safe again for pg_get_expr() applied to pg_index.indexprs, per gripefrom Alexander Zhiltsov.
1 parent05c561e commit4b10271

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1 file changed

+30
-70
lines changed

1 file changed

+30
-70
lines changed

‎src/backend/utils/adt/ruleutils.c‎

Lines changed: 30 additions & 70 deletions
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@
33
*back to source text
44
*
55
* IDENTIFICATION
6-
* $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.181 2004/09/13 20:07:13 tgl Exp $
6+
* $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.182 2004/10/07 20:36:52 tgl Exp $
77
*
88
* This software is copyrighted by Jan Wieck - Hamburg.
99
*
@@ -2351,15 +2351,7 @@ get_insert_query_def(Query *query, deparse_context *context)
23512351
{
23522352
appendContextKeyword(context,"VALUES (",
23532353
-PRETTYINDENT_STD,PRETTYINDENT_STD,2);
2354-
sep="";
2355-
foreach(l,strippedexprs)
2356-
{
2357-
Node*expr=lfirst(l);
2358-
2359-
appendStringInfo(buf,sep);
2360-
sep=", ";
2361-
get_rule_expr(expr,context, false);
2362-
}
2354+
get_rule_expr((Node*)strippedexprs,context, false);
23632355
appendStringInfoChar(buf,')');
23642356
}
23652357
else
@@ -2938,7 +2930,9 @@ get_rule_expr(Node *node, deparse_context *context,
29382930
/*
29392931
* Each level of get_rule_expr must emit an indivisible term
29402932
* (parenthesized if necessary) to ensure result is reparsed into the
2941-
* same expression tree.
2933+
* same expression tree. The only exception is that when the input
2934+
* is a List, we emit the component items comma-separated with no
2935+
* surrounding decoration; this is convenient for most callers.
29422936
*
29432937
* There might be some work left here to support additional node types.
29442938
*/
@@ -3269,20 +3263,10 @@ get_rule_expr(Node *node, deparse_context *context,
32693263
caseT_ArrayExpr:
32703264
{
32713265
ArrayExpr*arrayexpr= (ArrayExpr*)node;
3272-
ListCell*element;
3273-
char*sep;
32743266

32753267
appendStringInfo(buf,"ARRAY[");
3276-
sep="";
3277-
foreach(element,arrayexpr->elements)
3278-
{
3279-
Node*e= (Node*)lfirst(element);
3280-
3281-
appendStringInfo(buf,sep);
3282-
get_rule_expr(e,context, true);
3283-
sep=", ";
3284-
}
3285-
appendStringInfo(buf,"]");
3268+
get_rule_expr((Node*)arrayexpr->elements,context, true);
3269+
appendStringInfoChar(buf,']');
32863270
}
32873271
break;
32883272

@@ -3348,40 +3332,20 @@ get_rule_expr(Node *node, deparse_context *context,
33483332
caseT_CoalesceExpr:
33493333
{
33503334
CoalesceExpr*coalesceexpr= (CoalesceExpr*)node;
3351-
ListCell*arg;
3352-
char*sep;
33533335

33543336
appendStringInfo(buf,"COALESCE(");
3355-
sep="";
3356-
foreach(arg,coalesceexpr->args)
3357-
{
3358-
Node*e= (Node*)lfirst(arg);
3359-
3360-
appendStringInfo(buf,sep);
3361-
get_rule_expr(e,context, true);
3362-
sep=", ";
3363-
}
3364-
appendStringInfo(buf,")");
3337+
get_rule_expr((Node*)coalesceexpr->args,context, true);
3338+
appendStringInfoChar(buf,')');
33653339
}
33663340
break;
33673341

33683342
caseT_NullIfExpr:
33693343
{
33703344
NullIfExpr*nullifexpr= (NullIfExpr*)node;
3371-
ListCell*arg;
3372-
char*sep;
33733345

33743346
appendStringInfo(buf,"NULLIF(");
3375-
sep="";
3376-
foreach(arg,nullifexpr->args)
3377-
{
3378-
Node*e= (Node*)lfirst(arg);
3379-
3380-
appendStringInfo(buf,sep);
3381-
get_rule_expr(e,context, true);
3382-
sep=", ";
3383-
}
3384-
appendStringInfo(buf,")");
3347+
get_rule_expr((Node*)nullifexpr->args,context, true);
3348+
appendStringInfoChar(buf,')');
33853349
}
33863350
break;
33873351

@@ -3478,6 +3442,21 @@ get_rule_expr(Node *node, deparse_context *context,
34783442
appendStringInfo(buf,"DEFAULT");
34793443
break;
34803444

3445+
caseT_List:
3446+
{
3447+
char*sep;
3448+
ListCell*l;
3449+
3450+
sep="";
3451+
foreach(l, (List*)node)
3452+
{
3453+
appendStringInfo(buf,sep);
3454+
get_rule_expr((Node*)lfirst(l),context,showimplicit);
3455+
sep=", ";
3456+
}
3457+
}
3458+
break;
3459+
34813460
default:
34823461
elog(ERROR,"unrecognized node type: %d", (int)nodeTag(node));
34833462
break;
@@ -3560,7 +3539,6 @@ get_func_expr(FuncExpr *expr, deparse_context *context,
35603539
Oidargtypes[FUNC_MAX_ARGS];
35613540
intnargs;
35623541
ListCell*l;
3563-
char*sep;
35643542

35653543
/*
35663544
* If the function call came from an implicit coercion, then just show
@@ -3613,14 +3591,7 @@ get_func_expr(FuncExpr *expr, deparse_context *context,
36133591

36143592
appendStringInfo(buf,"%s(",
36153593
generate_function_name(funcoid,nargs,argtypes));
3616-
3617-
sep="";
3618-
foreach(l,expr->args)
3619-
{
3620-
appendStringInfo(buf,sep);
3621-
sep=", ";
3622-
get_rule_expr((Node*)lfirst(l),context, true);
3623-
}
3594+
get_rule_expr((Node*)expr->args,context, true);
36243595
appendStringInfoChar(buf,')');
36253596
}
36263597

@@ -3787,8 +3758,6 @@ get_sublink_expr(SubLink *sublink, deparse_context *context)
37873758
{
37883759
StringInfobuf=context->buf;
37893760
Query*query= (Query*) (sublink->subselect);
3790-
ListCell*l;
3791-
char*sep;
37923761
boolneed_paren;
37933762

37943763
if (sublink->subLinkType==ARRAY_SUBLINK)
@@ -3801,19 +3770,10 @@ get_sublink_expr(SubLink *sublink, deparse_context *context)
38013770
need_paren= (list_length(sublink->lefthand)>1);
38023771
if (need_paren)
38033772
appendStringInfoChar(buf,'(');
3804-
3805-
sep="";
3806-
foreach(l,sublink->lefthand)
3807-
{
3808-
appendStringInfo(buf,sep);
3809-
sep=", ";
3810-
get_rule_expr((Node*)lfirst(l),context, true);
3811-
}
3812-
3773+
get_rule_expr((Node*)sublink->lefthand,context, true);
38133774
if (need_paren)
3814-
appendStringInfo(buf,") ");
3815-
else
3816-
appendStringInfoChar(buf,' ');
3775+
appendStringInfoChar(buf,')');
3776+
appendStringInfoChar(buf,' ');
38173777
}
38183778

38193779
need_paren= true;

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