Fix ReorderBufferCheckMemoryLimit() comment.

Commit 7259736a6 updated the comment but it was not correct since
ReorderBufferLargestStreamableTopTXN() returns only top-level
transactions.

Reviewed-by: Amit Kapila
Discussion: https://postgr.es/m/CAD21AoA9XB7OR86BqvrCe2dMYX%2BZv3-BvVmjF%3DGY2z6jN-kqjg%40mail.gmail.com
Backpatch-through: 14

diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index 721fa652d25d8df0611dec280e21a68231704fe8..264c253a878cd9ba58ace97f10f50491c3c25ac5 100644 (file)
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -3500,8 +3500,8 @@ ReorderBufferCheckMemoryLimit(ReorderBuffer *rb)
    while (rb->size >= logical_decoding_work_mem * 1024L)
    {
        /*
-        * Pick the largest transaction (or subtransaction) and evict it from
-        * memory by streaming, if possible.  Otherwise, spill to disk.
+        * Pick the largest transaction and evict it from memory by streaming,
+        * if possible.  Otherwise, spill to disk.
         */
        if (ReorderBufferCanStartStreaming(rb) &&
            (txn = ReorderBufferLargestTopTXN(rb)) != NULL)