Add BEGIN/COMMIT for transactional messages during decoding.

In test_decoding module, when skip_empty_xacts option was specified, add
BEGIN/COMMIT for transactional messages. This makes the handling of
transactional messages consistent irrespective of whether skip_empty_xacts
option was specified.

We decided not to backpatch this change because skip_empty_xacts is
primarily used to have consistent test results across different runs and
this change won't help with that.

Author: Vignesh C
Reviewed-by: Ashutosh Bapat, Hou Zhijie
Discussion: https://postgr.es/m/CAExHW5ujRhbOz6_aTq_jQA8NjeFqq9d_8G9viShWvXx8gdSXiQ@mail.gmail.com

1 files changed, 12 insertions, 0 deletions

diff --git a/contrib/test_decoding/test_decoding.c b/contrib/test_decoding/test_decoding.c
index 12d1d0505d7..ab870d9e4dc 100644
--- a/contrib/test_decoding/test_decoding.c
+++ b/contrib/test_decoding/test_decoding.c
@@ -743,6 +743,18 @@ pg_decode_message(LogicalDecodingContext *ctx,
 				  ReorderBufferTXN *txn, XLogRecPtr lsn, bool transactional,
 				  const char *prefix, Size sz, const char *message)
 {
+	TestDecodingData *data = ctx->output_plugin_private;
+	TestDecodingTxnData *txndata;
+
+	txndata = transactional ? txn->output_plugin_private : NULL;
+
+	/* output BEGIN if we haven't yet for transactional messages */
+	if (transactional && data->skip_empty_xacts && !txndata->xact_wrote_changes)
+		pg_output_begin(ctx, data, txn, false);
+
+	if (transactional)
+		txndata->xact_wrote_changes = true;
+
 	OutputPluginPrepareWrite(ctx, true);
 	appendStringInfo(ctx->out, "message: transactional: %d prefix: %s, sz: %zu content:",
 					 transactional, prefix, sz);