On Fri, May 19, 2017 at 1:16 PM, Higuchi, Daisuke
<higuchi.dais...@jp.fujitsu.com> wrote:
> The reason of this problem is that sending 'show transaction_read_only' is 
> failed.
> 'show' must be in uppercase letters because the streaming replication 
> protocol only accepts capital letters.
> In psql and libpq applications that do not use the streaming replication 
> protocol, this error does not occur.
> The attached patch fixes this. This patch changes 'show 
> transaction_read_only' to 'SHOW transaction_read_only'.

                     if (!PQsendQuery(conn,
-                                     "show transaction_read_only"))
+                                     "SHOW transaction_read_only"))
Or perhaps the replication command parser could be made more flexible
with lower-case characters for replication commands?

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