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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
This commit is contained in:
Amit Kapila 2023-07-11 08:31:11 +05:30
parent 4e9fa6d56b
commit 26dd0284b9
3 changed files with 21 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
contrib/test_decoding/expected/messages.out
View File

@ -58,17 +58,23 @@ SELECT 'ignorethis' FROM pg_logical_emit_message(true, 'test', 'czechtastic');
ignorethis
(1 row)
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'force-binary', '0', 'skip-empty-xacts', '1');
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'force-binary', '0', 'skip-empty-xacts', '1', 'include-xids', '0');
data
--------------------------------------------------------------------
BEGIN
message: transactional: 1 prefix: test, sz: 4 content:msg1
COMMIT
message: transactional: 0 prefix: test, sz: 4 content:msg2
message: transactional: 0 prefix: test, sz: 4 content:msg4
message: transactional: 0 prefix: test, sz: 4 content:msg6
BEGIN
message: transactional: 1 prefix: test, sz: 4 content:msg5
message: transactional: 1 prefix: test, sz: 4 content:msg7
COMMIT
BEGIN
message: transactional: 1 prefix: test, sz: 11 content:czechtastic
(7 rows)
COMMIT
(13 rows)
-- test db filtering
\set prevdb :DBNAME

2
contrib/test_decoding/sql/messages.sql
View File

@ -19,7 +19,7 @@ COMMIT;
SELECT 'ignorethis' FROM pg_logical_emit_message(true, 'test', 'czechtastic');
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'force-binary', '0', 'skip-empty-xacts', '1');
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'force-binary', '0', 'skip-empty-xacts', '1', 'include-xids', '0');
-- test db filtering
\set prevdb :DBNAME

12
contrib/test_decoding/test_decoding.c
View File

@ -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);