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Handle heap rewrites even better in logical decoding

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Logical decoding should not publish anything about tables created as
part of a heap rewrite during DDL.  Those tables don't exist externally,
so consumers of logical decoding cannot do anything sensible with that
information.  In ab28feae2b, we worked
around this for built-in logical replication, but that was hack.

This is a more proper fix: We mark such transient heaps using the new
field pg_class.relwrite, linking to the original relation OID.  By
default, we ignore them in logical decoding before they get to the
output plugin.  Optionally, a plugin can register their interest in
getting such changes, if they handle DDL specially, in which case the
new field will help them get information about the actual table.

Reviewed-by: Craig Ringer <craig@2ndquadrant.com>
This commit is contained in:
Peter Eisentraut
2018-03-21 09:13:24 -04:00
parent be8a7a6866
commit 325f2ec555
20 changed files with 113 additions and 103 deletions
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14
contrib/test_decoding/test_decoding.c
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@ -101,6 +101,7 @@ pg_decode_startup(LogicalDecodingContext *ctx, OutputPluginOptions *opt,
ctx->output_plugin_private = data;
opt->output_type = OUTPUT_PLUGIN_TEXTUAL_OUTPUT;
opt->receive_rewrites = false;
foreach(option, ctx->output_plugin_options)
{
@ -166,6 +167,17 @@ pg_decode_startup(LogicalDecodingContext *ctx, OutputPluginOptions *opt,
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "include-rewrites") == 0)
{
if (elem->arg == NULL)
continue;
else if (!parse_bool(strVal(elem->arg), &opt->receive_rewrites))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else
{
ereport(ERROR,
@ -412,6 +424,8 @@ pg_decode_change(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
quote_qualified_identifier(
get_namespace_name(
get_rel_namespace(RelationGetRelid(relation))),
class_form->relrewrite ?
get_rel_name(class_form->relrewrite) :
NameStr(class_form->relname)));
appendStringInfoChar(ctx->out, ':');