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Generated columns

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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
This commit is contained in:
Peter Eisentraut
2019-03-30 08:13:09 +01:00
parent 6b8b5364dd
commit fc22b6623b
84 changed files with 3067 additions and 157 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
src/backend/replication/logical/proto.c
View File

@@ -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. */

2
src/backend/replication/logical/relation.c
View File

@@ -276,7 +276,7 @@ logicalrep_rel_open(LogicalRepRelId remoteid, LOCKMODE lockmode)
int attnum;
Form_pg_attribute attr = TupleDescAttr(desc, i);
if (attr->attisdropped)
if (attr->attisdropped || attr->attgenerated)
{
entry->attrmap[i] = -1;
continue;

6
src/backend/replication/logical/tablesync.c
View File

@@ -697,10 +697,12 @@ fetch_remote_table_info(char *nspname, char *relname,
" LEFT JOIN pg_catalog.pg_index i"
" ON (i.indexrelid = pg_get_replica_identity_index(%u))"
" WHERE a.attnum > 0::pg_catalog.int2"
" AND NOT a.attisdropped"
" AND NOT a.attisdropped %s"
" AND a.attrelid = %u"
" ORDER BY a.attnum",
lrel->remoteid, lrel->remoteid);
lrel->remoteid,
(walrcv_server_version(wrconn) >= 120000 ? "AND a.attgenerated = ''" : ""),
lrel->remoteid);
res = walrcv_exec(wrconn, cmd.data, 4, attrRow);
if (res->status != WALRCV_OK_TUPLES)

2
src/backend/replication/logical/worker.c
View File

@@ -236,7 +236,7 @@ slot_fill_defaults(LogicalRepRelMapEntry *rel, EState *estate,
{
Expr *defexpr;
if (TupleDescAttr(desc, attnum)->attisdropped)
if (TupleDescAttr(desc, attnum)->attisdropped || TupleDescAttr(desc, attnum)->attgenerated)
continue;
if (rel->attrmap[attnum] >= 0)