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Clean up handling of dropped columns in NAMEDTUPLESTORE RTEs.

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The NAMEDTUPLESTORE patch piggybacked on the infrastructure for
TABLEFUNC/VALUES/CTE RTEs, none of which can ever have dropped columns,
so the possibility was ignored most places.  Fix that, including adding a
specification to parsenodes.h about what it's supposed to look like.

In passing, clean up assorted comments that hadn't been maintained
properly by said patch.

Per bug #14799 from Philippe Beaudoin.  Back-patch to v10.

Discussion: https://postgr.es/m/20170906120005.25630.84360@wrigleys.postgresql.org
This commit is contained in:
Tom Lane
2017-09-06 10:41:05 -04:00
parent 0b554e4e63
commit 8689e38263
5 changed files with 77 additions and 38 deletions
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98
src/backend/parser/parse_relation.c
View File

@ -2014,11 +2014,13 @@ addRangeTableEntryForENR(ParseState *pstate,
/*
* Build the list of effective column names using user-supplied aliases
* and/or actual column names. Also build the cannibalized fields.
* and/or actual column names.
*/
tupdesc = ENRMetadataGetTupDesc(enrmd);
rte->eref = makeAlias(refname, NIL);
buildRelationAliases(tupdesc, alias, rte->eref);
/* Record additional data for ENR, including column type info */
rte->enrname = enrmd->name;
rte->enrtuples = enrmd->enrtuples;
rte->coltypes = NIL;
@ -2028,16 +2030,24 @@ addRangeTableEntryForENR(ParseState *pstate,
{
Form_pg_attribute att = TupleDescAttr(tupdesc, attno - 1);
if (att->atttypid == InvalidOid &&
!(att->attisdropped))
elog(ERROR, "atttypid was invalid for column which has not been dropped from \"%s\"",
rv->relname);
rte->coltypes =
lappend_oid(rte->coltypes, att->atttypid);
rte->coltypmods =
lappend_int(rte->coltypmods, att->atttypmod);
rte->colcollations =
lappend_oid(rte->colcollations, att->attcollation);
if (att->attisdropped)
{
/* Record zeroes for a dropped column */
rte->coltypes = lappend_oid(rte->coltypes, InvalidOid);
rte->coltypmods = lappend_int(rte->coltypmods, 0);
rte->colcollations = lappend_oid(rte->colcollations, InvalidOid);
}
else
{
/* Let's just make sure we can tell this isn't dropped */
if (att->atttypid == InvalidOid)
elog(ERROR, "atttypid is invalid for non-dropped column in \"%s\"",
rv->relname);
rte->coltypes = lappend_oid(rte->coltypes, att->atttypid);
rte->coltypmods = lappend_int(rte->coltypmods, att->atttypmod);
rte->colcollations = lappend_oid(rte->colcollations,
att->attcollation);
}
}
/*
@ -2416,7 +2426,7 @@ expandRTE(RangeTblEntry *rte, int rtindex, int sublevels_up,
case RTE_CTE:
case RTE_NAMEDTUPLESTORE:
{
/* Tablefunc, Values or CTE RTE */
/* Tablefunc, Values, CTE, or ENR RTE */
ListCell *aliasp_item = list_head(rte->eref->colnames);
ListCell *lct;
ListCell *lcm;
@ -2436,23 +2446,43 @@ expandRTE(RangeTblEntry *rte, int rtindex, int sublevels_up,
if (colnames)
{
/* Assume there is one alias per output column */
char *label = strVal(lfirst(aliasp_item));
if (OidIsValid(coltype))
{
char *label = strVal(lfirst(aliasp_item));
*colnames = lappend(*colnames,
makeString(pstrdup(label)));
}
else if (include_dropped)
*colnames = lappend(*colnames,
makeString(pstrdup("")));
*colnames = lappend(*colnames,
makeString(pstrdup(label)));
aliasp_item = lnext(aliasp_item);
}
if (colvars)
{
Var *varnode;
if (OidIsValid(coltype))
{
Var *varnode;
varnode = makeVar(rtindex, varattno,
coltype, coltypmod, colcoll,
sublevels_up);
varnode->location = location;
varnode = makeVar(rtindex, varattno,
coltype, coltypmod, colcoll,
sublevels_up);
varnode->location = location;
*colvars = lappend(*colvars, varnode);
*colvars = lappend(*colvars, varnode);
}
else if (include_dropped)
{
/*
* It doesn't really matter what type the Const
* claims to be.
*/
*colvars = lappend(*colvars,
makeNullConst(INT4OID, -1,
InvalidOid));
}
}
}
}
@ -2831,13 +2861,21 @@ get_rte_attribute_type(RangeTblEntry *rte, AttrNumber attnum,
case RTE_NAMEDTUPLESTORE:
{
/*
* tablefunc, VALUES or CTE RTE --- get type info from lists
* in the RTE
* tablefunc, VALUES, CTE, or ENR RTE --- get type info from
* lists in the RTE
*/
Assert(attnum > 0 && attnum <= list_length(rte->coltypes));
*vartype = list_nth_oid(rte->coltypes, attnum - 1);
*vartypmod = list_nth_int(rte->coltypmods, attnum - 1);
*varcollid = list_nth_oid(rte->colcollations, attnum - 1);
/* For ENR, better check for dropped column */
if (!OidIsValid(*vartype))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("column %d of relation \"%s\" does not exist",
attnum,
rte->eref->aliasname)));
}
break;
default:
@ -2888,15 +2926,11 @@ get_rte_attribute_is_dropped(RangeTblEntry *rte, AttrNumber attnum)
break;
case RTE_NAMEDTUPLESTORE:
{
Assert(rte->enrname);
/*
* We checked when we loaded coltypes for the tuplestore that
* InvalidOid was only used for dropped columns, so it is safe
* to count on that here.
*/
result =
((list_nth_oid(rte->coltypes, attnum - 1) == InvalidOid));
/* Check dropped-ness by testing for valid coltype */
if (attnum <= 0 ||
attnum > list_length(rte->coltypes))
elog(ERROR, "invalid varattno %d", attnum);
result = !OidIsValid((list_nth_oid(rte->coltypes, attnum - 1)));
}
break;
case RTE_JOIN: