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-rw-r--r--src/bin/pg_upgrade/dump.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/bin/pg_upgrade/dump.c b/src/bin/pg_upgrade/dump.c
index 4d730adfe24..20e73be3615 100644
--- a/src/bin/pg_upgrade/dump.c
+++ b/src/bin/pg_upgrade/dump.c
@@ -52,9 +52,11 @@ generate_old_dump(void)
parallel_exec_prog(log_file_name, NULL,
"\"%s/pg_dump\" %s --schema-only --quote-all-identifiers "
- "--binary-upgrade --format=custom %s --file=\"%s\" %s",
+ "--binary-upgrade --format=custom %s %s --file=\"%s\" %s",
new_cluster.bindir, cluster_conn_opts(&old_cluster),
log_opts.verbose ? "--verbose" : "",
+ user_opts.ind_coll_unknown ?
+ "--index-collation-versions-unknown" : "",
sql_file_name, escaped_connstr.data);
termPQExpBuffer(&escaped_connstr);