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| author | Peter Eisentraut <peter@eisentraut.org> | 2019-03-30 08:13:09 +0100 |
|---|---|---|
| committer | Peter Eisentraut <peter@eisentraut.org> | 2019-03-30 08:15:57 +0100 |
| commit | fc22b6623b6b3bab3cb057ccd282c2bfad1a0b30 (patch) | |
| tree | cda5092955ece5d547d5517ed56a3d480f199d25 /src/backend/replication/logical/proto.c | |
| parent | 6b8b5364ddd0e4d882562615c6b6c28638ade9f2 (diff) | |
Generated columns
This is an SQL-standard feature that allows creating columns that are
computed from expressions rather than assigned, similar to a view or
materialized view but on a column basis.
This implements one kind of generated column: stored (computed on
write). Another kind, virtual (computed on read), is planned for the
future, and some room is left for it.
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/b151f851-4019-bdb1-699e-ebab07d2f40a@2ndquadrant.com
Diffstat (limited to 'src/backend/replication/logical/proto.c')
| -rw-r--r-- | src/backend/replication/logical/proto.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/src/backend/replication/logical/proto.c b/src/backend/replication/logical/proto.c index dffb6cd9fd6..0411963f939 100644 --- a/src/backend/replication/logical/proto.c +++ b/src/backend/replication/logical/proto.c @@ -453,7 +453,7 @@ logicalrep_write_tuple(StringInfo out, Relation rel, HeapTuple tuple) for (i = 0; i < desc->natts; i++) { - if (TupleDescAttr(desc, i)->attisdropped) + if (TupleDescAttr(desc, i)->attisdropped || TupleDescAttr(desc, i)->attgenerated) continue; nliveatts++; } @@ -473,8 +473,7 @@ logicalrep_write_tuple(StringInfo out, Relation rel, HeapTuple tuple) Form_pg_attribute att = TupleDescAttr(desc, i); char *outputstr; - /* skip dropped columns */ - if (att->attisdropped) + if (att->attisdropped || att->attgenerated) continue; if (isnull[i]) @@ -573,7 +572,7 @@ logicalrep_write_attrs(StringInfo out, Relation rel) /* send number of live attributes */ for (i = 0; i < desc->natts; i++) { - if (TupleDescAttr(desc, i)->attisdropped) + if (TupleDescAttr(desc, i)->attisdropped || TupleDescAttr(desc, i)->attgenerated) continue; nliveatts++; } @@ -591,7 +590,7 @@ logicalrep_write_attrs(StringInfo out, Relation rel) Form_pg_attribute att = TupleDescAttr(desc, i); uint8 flags = 0; - if (att->attisdropped) + if (att->attisdropped || att->attgenerated) continue; /* REPLICA IDENTITY FULL means all columns are sent as part of key. */ |