Don't pass "ONLY" options specified in TRUNCATE to foreign data wrapper.

Commit 8ff1c94649 allowed TRUNCATE command to truncate foreign tables.
Previously the information about "ONLY" options specified in TRUNCATE
command were passed to the foreign data wrapper. Then postgres_fdw
constructed the TRUNCATE command to issue the remote server and
included "ONLY" options in it based on the passed information.

On the other hand, "ONLY" options specified in SELECT, UPDATE or DELETE
have no effect when accessing or modifying the remote table, i.e.,
are not passed to the foreign data wrapper. So it's inconsistent to
make only TRUNCATE command pass the "ONLY" options to the foreign data
wrapper. Therefore this commit changes the TRUNCATE command so that
it doesn't pass the "ONLY" options to the foreign data wrapper,
for the consistency with other statements. Also this commit changes
postgres_fdw so that it always doesn't include "ONLY" options in
the TRUNCATE command that it constructs.

Author: Fujii Masao
Reviewed-by: Bharath Rupireddy, Kyotaro Horiguchi, Justin Pryzby, Zhihong Yu
Discussion: https://postgr.es/m/551ed8c1-f531-818b-664a-2cecdab99cd8@oss.nttdata.com

1 files changed, 4 insertions, 9 deletions

diff --git a/contrib/postgres_fdw/deparse.c b/contrib/postgres_fdw/deparse.c
index bdc4c3620d0..7a798530e3a 100644
--- a/contrib/postgres_fdw/deparse.c
+++ b/contrib/postgres_fdw/deparse.c
@@ -2179,24 +2179,19 @@ deparseAnalyzeSql(StringInfo buf, Relation rel, List **retrieved_attrs)
 void
 deparseTruncateSql(StringInfo buf,
 				   List *rels,
-				   List *rels_extra,
 				   DropBehavior behavior,
 				   bool restart_seqs)
 {
-	ListCell   *lc1,
-			   *lc2;
+	ListCell   *cell;
 
 	appendStringInfoString(buf, "TRUNCATE ");
 
-	forboth(lc1, rels, lc2, rels_extra)
+	foreach(cell, rels)
 	{
-		Relation	rel = lfirst(lc1);
-		int			extra = lfirst_int(lc2);
+		Relation	rel = lfirst(cell);
 
-		if (lc1 != list_head(rels))
+		if (cell != list_head(rels))
 			appendStringInfoString(buf, ", ");
-		if (extra & TRUNCATE_REL_CONTEXT_ONLY)
-			appendStringInfoString(buf, "ONLY ");
 
 		deparseRelation(buf, rel);
 	}