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Preserve replica identity index across ALTER TABLE rewrite

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If an index was explicitly set as replica identity index, this setting
was lost when a table was rewritten by ALTER TABLE.  Because this
setting is part of pg_index but actually controlled by ALTER
TABLE (not part of CREATE INDEX, say), we have to do some extra work
to restore it.

Based-on-patch-by: Quan Zongliang <quanzongliang@gmail.com>
Reviewed-by: Euler Taveira <euler.taveira@2ndquadrant.com>
Discussion: https://www.postgresql.org/message-id/flat/c70fcab2-4866-0d9f-1d01-e75e189db342@gmail.com
This commit is contained in:
Peter Eisentraut
2020-03-13 11:28:11 +01:00
parent 630590d6ff
commit c9ef507e82
5 changed files with 133 additions and 0 deletions
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23
src/backend/utils/cache/lsyscache.c vendored
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@ -3228,6 +3228,29 @@ get_index_column_opclass(Oid index_oid, int attno)
return opclass;
}
/*
* get_index_isreplident
*
* Given the index OID, return pg_index.indisreplident.
*/
bool
get_index_isreplident(Oid index_oid)
{
HeapTuple tuple;
Form_pg_index rd_index;
bool result;
tuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(index_oid));
if (!HeapTupleIsValid(tuple))
return false;
rd_index = (Form_pg_index) GETSTRUCT(tuple);
result = rd_index->indisreplident;
ReleaseSysCache(tuple);
return result;
}
/*
* get_index_isvalid
*