From fc22b6623b6b3bab3cb057ccd282c2bfad1a0b30 Mon Sep 17 00:00:00 2001 From: Peter Eisentraut Date: Sat, 30 Mar 2019 08:13:09 +0100 Subject: 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 Reviewed-by: Pavel Stehule Discussion: https://www.postgresql.org/message-id/flat/b151f851-4019-bdb1-699e-ebab07d2f40a@2ndquadrant.com --- src/backend/parser/parse_agg.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'src/backend/parser/parse_agg.c') diff --git a/src/backend/parser/parse_agg.c b/src/backend/parser/parse_agg.c index 183ea0f2c4a..c745fcdd2b7 100644 --- a/src/backend/parser/parse_agg.c +++ b/src/backend/parser/parse_agg.c @@ -520,6 +520,14 @@ check_agglevels_and_constraints(ParseState *pstate, Node *expr) err = _("grouping operations are not allowed in partition key expressions"); break; + case EXPR_KIND_GENERATED_COLUMN: + + if (isAgg) + err = _("aggregate functions are not allowed in column generation expressions"); + else + err = _("grouping operations are not allowed in column generation expressions"); + + break; case EXPR_KIND_CALL_ARGUMENT: if (isAgg) @@ -922,6 +930,9 @@ transformWindowFuncCall(ParseState *pstate, WindowFunc *wfunc, case EXPR_KIND_COPY_WHERE: err = _("window functions are not allowed in COPY FROM WHERE conditions"); break; + case EXPR_KIND_GENERATED_COLUMN: + err = _("window functions are not allowed in column generation expressions"); + break; /* * There is intentionally no default: case here, so that the -- cgit v1.2.3