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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
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6
src/backend/replication/logical/tablesync.c
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@ -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)