After a deeper analysis, this post supersedes my
previous one with the same subject.
I got the error message:
ERROR: pltcl: Cache lookup for attribute
'........pg.droppped.7........' type 0 failed
when a pltcl trigger handler is fired.
Attribute names beginning with a dot are filtered
just in one place, in pltcl_trigger_handler().
(version 7.3.5)
Attached is a patch to :
- Add a filter in two other places, in relation
with the mentioned error message:
pltcl_set_tuple_values()
pltcl_build_tuple_argument()
- Add the same filter in the build of TG_relatts.
This will prevent a tcl script which loops on
TG_relattrs to fail in trying to use a dropped
column.
Note 1: the filter method is changed from testing if
attname begins with a dot to testing the setting
of attisdropped.
I presume (to be confirmed or contradicted by a
more authoritative developer than me) that the
original dot filtering intent was to filter
dropped columns. In other words, there is no
case where a column name begins with '.' except
dropped columns. If this is right, testing
attisdropped
is an adequate and more readable replacement.
Note 2: with the addition of the filter in
pltcl_build_tuple_argument(), filtering in
pltcl_trigger_handler() is no more needed, so I
put these lines in comments (may be removed in
a final release).
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--- pltcl.orig 2003-10-30 03:00:44.000000000 +0100
+++ pltclDotFilter2.c 2004-01-23 09:28:33.359375000 +0100
@@ -678,8 +678,9 @@
/* A list of attribute names for argument TG_relatts */
Tcl_DStringAppendElement(&tcl_trigtup, "");
for (i = 0; i < tupdesc->natts; i++)
- Tcl_DStringAppendElement(&tcl_trigtup,
-
NameStr(tupdesc->attrs[i]->attname));
+ if (!tupdesc->attrs[i]->attisdropped)
+ Tcl_DStringAppendElement(&tcl_trigtup,
+
NameStr(tupdesc->attrs[i]->attname));
Tcl_DStringAppendElement(&tcl_cmd, Tcl_DStringValue(&tcl_trigtup));
Tcl_DStringFree(&tcl_trigtup);
Tcl_DStringInit(&tcl_trigtup);
@@ -863,11 +864,11 @@
/************************************************************
* Ignore pseudo elements with a dot name
************************************************************/
- if (*(ret_values[i]) == '.')
- {
- i += 2;
- continue;
- }
+ //if (*(ret_values[i]) == '.')
+ //{
+ // i += 2;
+ // continue;
+ //}
/************************************************************
* Get the attribute number
@@ -2352,6 +2353,12 @@
for (i = 0; i < tupdesc->natts; i++)
{
/************************************************************
+ * Ignore dropped columns (attname begins with a dot,
+ * such as "........pg.dropped.7........")
+ ************************************************************/
+ if (tupdesc->attrs[i]->attisdropped) continue;
+
+ /************************************************************
* Get the attribute name
************************************************************/
attname = NameStr(tupdesc->attrs[i]->attname);
@@ -2424,6 +2431,12 @@
for (i = 0; i < tupdesc->natts; i++)
{
/************************************************************
+ * Ignore dropped columns (attname begins with a dot,
+ * such as "........pg.dropped.7........")
+ ************************************************************/
+ if (tupdesc->attrs[i]->attisdropped) continue;
+
+ /************************************************************
* Get the attribute name
************************************************************/
attname = NameStr(tupdesc->attrs[i]->attname);
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