--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Foreign Scan
Output: ft4.c1, ft4_1.c1, ft5.c1
- Relations: (public.ft4) FULL JOIN ((public.ft4) FULL JOIN (public.ft5))
+ Relations: (public.ft4) FULL JOIN ((public.ft4 ft4_1) FULL JOIN (public.ft5))
Remote SQL: SELECT s4.c1, s10.c1, s10.c2 FROM ((SELECT c1 FROM "S 1"."T 3" WHERE ((c1 >= 50)) AND ((c1 <= 60))) s4(c1) FULL JOIN (SELECT s8.c1, s9.c1 FROM ((SELECT c1 FROM "S 1"."T 3" WHERE ((c1 >= 50)) AND ((c1 <= 60))) s8(c1) FULL JOIN (SELECT c1 FROM "S 1"."T 4" WHERE ((c1 >= 50)) AND ((c1 <= 60))) s9(c1) ON (((s8.c1 = s9.c1)))) WHERE (((s8.c1 IS NULL) OR (s8.c1 IS NOT NULL)))) s10(c1, c2) ON (((s4.c1 = s10.c1)))) ORDER BY s4.c1 ASC NULLS LAST, s10.c1 ASC NULLS LAST, s10.c2 ASC NULLS LAST
(4 rows)
Remote SQL: SELECT r1."C 1", r2."C 1" FROM ("S 1"."T 1" r1 INNER JOIN "S 1"."T 1" r2 ON (((r1."C 1" = r2."C 1"))))
-> Foreign Scan
Output: t1_1.c1, t2_1.c1
- Relations: (public.ft1 t1) INNER JOIN (public.ft2 t2)
+ Relations: (public.ft1 t1_1) INNER JOIN (public.ft2 t2_1)
Remote SQL: SELECT r1."C 1", r2."C 1" FROM ("S 1"."T 1" r1 INNER JOIN "S 1"."T 1" r2 ON (((r1."C 1" = r2."C 1"))))
(20 rows)
Output: x.b, x.a
-> Foreign Scan
Output: ft1_1.c2, (sum(ft1_1.c1))
- Relations: Aggregate on (public.ft1)
+ Relations: Aggregate on (public.ft1 ft1_1)
Remote SQL: SELECT c2, sum("C 1") FROM "S 1"."T 1" GROUP BY 1
(21 rows)
-- inner join three tables
EXPLAIN (COSTS OFF)
SELECT t1.a,t2.b,t3.c FROM fprt1 t1 INNER JOIN fprt2 t2 ON (t1.a = t2.b) INNER JOIN fprt1 t3 ON (t2.b = t3.a) WHERE t1.a % 25 =0 ORDER BY 1,2,3;
- QUERY PLAN
---------------------------------------------------------------------------------------------------------------------
+ QUERY PLAN
+--------------------------------------------------------------------------------------------------------------------------
Sort
Sort Key: t1.a, t3.c
-> Append
-> Foreign Scan
Relations: ((public.ftprt1_p1 t1) INNER JOIN (public.ftprt2_p1 t2)) INNER JOIN (public.ftprt1_p1 t3)
-> Foreign Scan
- Relations: ((public.ftprt1_p2 t1) INNER JOIN (public.ftprt2_p2 t2)) INNER JOIN (public.ftprt1_p2 t3)
+ Relations: ((public.ftprt1_p2 t1_1) INNER JOIN (public.ftprt2_p2 t2_1)) INNER JOIN (public.ftprt1_p2 t3_1)
(7 rows)
SELECT t1.a,t2.b,t3.c FROM fprt1 t1 INNER JOIN fprt2 t2 ON (t1.a = t2.b) INNER JOIN fprt1 t3 ON (t2.b = t3.a) WHERE t1.a % 25 =0 ORDER BY 1,2,3;
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Foreign Scan
Output: t1.a, ftprt2_p1.b, ftprt2_p1.c
- Relations: (public.ftprt1_p1 t1) LEFT JOIN (public.ftprt2_p1 fprt2)
+ Relations: (public.ftprt1_p1 t1) LEFT JOIN (public.ftprt2_p1)
Remote SQL: SELECT r5.a, r6.b, r6.c FROM (public.fprt1_p1 r5 LEFT JOIN public.fprt2_p1 r6 ON (((r5.a = r6.b)) AND ((r5.b = r6.a)) AND ((r6.a < 10)))) WHERE ((r5.a < 10)) ORDER BY r5.a ASC NULLS LAST, r6.b ASC NULLS LAST, r6.c ASC NULLS LAST
(4 rows)
-- join with lateral reference
EXPLAIN (COSTS OFF)
SELECT t1.a,t1.b FROM fprt1 t1, LATERAL (SELECT t2.a, t2.b FROM fprt2 t2 WHERE t1.a = t2.b AND t1.b = t2.a) q WHERE t1.a%25 = 0 ORDER BY 1,2;
- QUERY PLAN
----------------------------------------------------------------------------------
+ QUERY PLAN
+-------------------------------------------------------------------------------------
Sort
Sort Key: t1.a, t1.b
-> Append
-> Foreign Scan
Relations: (public.ftprt1_p1 t1) INNER JOIN (public.ftprt2_p1 t2)
-> Foreign Scan
- Relations: (public.ftprt1_p2 t1) INNER JOIN (public.ftprt2_p2 t2)
+ Relations: (public.ftprt1_p2 t1_1) INNER JOIN (public.ftprt2_p2 t2_1)
(7 rows)
SELECT t1.a,t1.b FROM fprt1 t1, LATERAL (SELECT t2.a, t2.b FROM fprt2 t2 WHERE t1.a = t2.b AND t1.b = t2.a) q WHERE t1.a%25 = 0 ORDER BY 1,2;
SET enable_partitionwise_aggregate TO true;
EXPLAIN (COSTS OFF)
SELECT a, sum(b), min(b), count(*) FROM pagg_tab GROUP BY a HAVING avg(b) < 22 ORDER BY 1;
- QUERY PLAN
-----------------------------------------------------------------------
+ QUERY PLAN
+-------------------------------------------------------------
Sort
Sort Key: fpagg_tab_p1.a
-> Append
-> Foreign Scan
- Relations: Aggregate on (public.fpagg_tab_p1 pagg_tab)
+ Relations: Aggregate on (public.fpagg_tab_p1)
-> Foreign Scan
- Relations: Aggregate on (public.fpagg_tab_p2 pagg_tab)
+ Relations: Aggregate on (public.fpagg_tab_p2)
-> Foreign Scan
- Relations: Aggregate on (public.fpagg_tab_p3 pagg_tab)
+ Relations: Aggregate on (public.fpagg_tab_p3)
(9 rows)
SELECT a, sum(b), min(b), count(*) FROM pagg_tab GROUP BY a HAVING avg(b) < 22 ORDER BY 1;
*/
#include "postgres.h"
+#include <limits.h>
+
#include "access/htup_details.h"
#include "access/sysattr.h"
#include "access/table.h"
PgFdwRelationInfo *fpinfo;
ListCell *lc;
RangeTblEntry *rte = planner_rt_fetch(baserel->relid, root);
- const char *namespace;
- const char *relname;
- const char *refname;
/*
* We use PgFdwRelationInfo to pass various information to subsequent
}
/*
- * Set the name of relation in fpinfo, while we are constructing it here.
- * It will be used to build the string describing the join relation in
- * EXPLAIN output. We can't know whether VERBOSE option is specified or
- * not, so always schema-qualify the foreign table name.
+ * fpinfo->relation_name gets the numeric rangetable index of the foreign
+ * table RTE. (If this query gets EXPLAIN'd, we'll convert that to a
+ * human-readable string at that time.)
*/
- fpinfo->relation_name = makeStringInfo();
- namespace = get_namespace_name(get_rel_namespace(foreigntableid));
- relname = get_rel_name(foreigntableid);
- refname = rte->eref->aliasname;
- appendStringInfo(fpinfo->relation_name, "%s.%s",
- quote_identifier(namespace),
- quote_identifier(relname));
- if (*refname && strcmp(refname, relname) != 0)
- appendStringInfo(fpinfo->relation_name, " %s",
- quote_identifier(rte->eref->aliasname));
+ fpinfo->relation_name = psprintf("%u", baserel->relid);
/* No outer and inner relations. */
fpinfo->make_outerrel_subquery = false;
makeInteger(fpinfo->fetch_size));
if (IS_JOIN_REL(foreignrel) || IS_UPPER_REL(foreignrel))
fdw_private = lappend(fdw_private,
- makeString(fpinfo->relation_name->data));
+ makeString(fpinfo->relation_name));
/*
* Create the ForeignScan node for the given relation.
static void
postgresExplainForeignScan(ForeignScanState *node, ExplainState *es)
{
- List *fdw_private;
- char *sql;
- char *relations;
-
- fdw_private = ((ForeignScan *) node->ss.ps.plan)->fdw_private;
+ ForeignScan *plan = castNode(ForeignScan, node->ss.ps.plan);
+ List *fdw_private = plan->fdw_private;
/*
- * Add names of relation handled by the foreign scan when the scan is a
- * join
+ * Identify foreign scans that are really joins or upper relations. The
+ * input looks something like "(1) LEFT JOIN (2)", and we must replace the
+ * digit string(s), which are RT indexes, with the correct relation names.
+ * We do that here, not when the plan is created, because we can't know
+ * what aliases ruleutils.c will assign at plan creation time.
*/
if (list_length(fdw_private) > FdwScanPrivateRelations)
{
- relations = strVal(list_nth(fdw_private, FdwScanPrivateRelations));
- ExplainPropertyText("Relations", relations, es);
+ StringInfo relations;
+ char *rawrelations;
+ char *ptr;
+ int minrti,
+ rtoffset;
+
+ rawrelations = strVal(list_nth(fdw_private, FdwScanPrivateRelations));
+
+ /*
+ * A difficulty with using a string representation of RT indexes is
+ * that setrefs.c won't update the string when flattening the
+ * rangetable. To find out what rtoffset was applied, identify the
+ * minimum RT index appearing in the string and compare it to the
+ * minimum member of plan->fs_relids. (We expect all the relids in
+ * the join will have been offset by the same amount; the Asserts
+ * below should catch it if that ever changes.)
+ */
+ minrti = INT_MAX;
+ ptr = rawrelations;
+ while (*ptr)
+ {
+ if (isdigit((unsigned char) *ptr))
+ {
+ int rti = strtol(ptr, &ptr, 10);
+
+ if (rti < minrti)
+ minrti = rti;
+ }
+ else
+ ptr++;
+ }
+ rtoffset = bms_next_member(plan->fs_relids, -1) - minrti;
+
+ /* Now we can translate the string */
+ relations = makeStringInfo();
+ ptr = rawrelations;
+ while (*ptr)
+ {
+ if (isdigit((unsigned char) *ptr))
+ {
+ int rti = strtol(ptr, &ptr, 10);
+ RangeTblEntry *rte;
+ char *namespace;
+ char *relname;
+ char *refname;
+
+ rti += rtoffset;
+ Assert(bms_is_member(rti, plan->fs_relids));
+ rte = rt_fetch(rti, es->rtable);
+ Assert(rte->rtekind == RTE_RELATION);
+ /* This logic should agree with explain.c's ExplainTargetRel */
+ namespace = get_namespace_name(get_rel_namespace(rte->relid));
+ relname = get_rel_name(rte->relid);
+ appendStringInfo(relations, "%s.%s",
+ quote_identifier(namespace),
+ quote_identifier(relname));
+ refname = (char *) list_nth(es->rtable_names, rti - 1);
+ if (refname == NULL)
+ refname = rte->eref->aliasname;
+ if (strcmp(refname, relname) != 0)
+ appendStringInfo(relations, " %s",
+ quote_identifier(refname));
+ }
+ else
+ appendStringInfoChar(relations, *ptr++);
+ }
+ ExplainPropertyText("Relations", relations->data, es);
}
/*
*/
if (es->verbose)
{
+ char *sql;
+
sql = strVal(list_nth(fdw_private, FdwScanPrivateSelectSql));
ExplainPropertyText("Remote SQL", sql, es);
}
/*
* Set the string describing this join relation to be used in EXPLAIN
- * output of corresponding ForeignScan.
+ * output of corresponding ForeignScan. Note that the decoration we add
+ * to the base relation names mustn't include any digits, or it'll confuse
+ * postgresExplainForeignScan.
*/
- fpinfo->relation_name = makeStringInfo();
- appendStringInfo(fpinfo->relation_name, "(%s) %s JOIN (%s)",
- fpinfo_o->relation_name->data,
- get_jointype_name(fpinfo->jointype),
- fpinfo_i->relation_name->data);
+ fpinfo->relation_name = psprintf("(%s) %s JOIN (%s)",
+ fpinfo_o->relation_name,
+ get_jointype_name(fpinfo->jointype),
+ fpinfo_i->relation_name);
/*
* Set the relation index. This is defined as the position of this
/*
* Set the string describing this grouped relation to be used in EXPLAIN
- * output of corresponding ForeignScan.
+ * output of corresponding ForeignScan. Note that the decoration we add
+ * to the base relation name mustn't include any digits, or it'll confuse
+ * postgresExplainForeignScan.
*/
- fpinfo->relation_name = makeStringInfo();
- appendStringInfo(fpinfo->relation_name, "Aggregate on (%s)",
- ofpinfo->relation_name->data);
+ fpinfo->relation_name = psprintf("Aggregate on (%s)",
+ ofpinfo->relation_name);
return true;
}
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