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Allow generalized expression syntax for partition bounds

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Previously, only literals were allowed.  This change allows general
expressions, including functions calls, which are evaluated at the
time the DDL command is executed.

Besides offering some more functionality, it simplifies the parser
structures and removes some inconsistencies in how the literals were
handled.

Author: Kyotaro Horiguchi, Tom Lane, Amit Langote
Reviewed-by: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Discussion: https://www.postgresql.org/message-id/flat/9f88b5e0-6da2-5227-20d0-0d7012beaa1c@lab.ntt.co.jp/
This commit is contained in:
Peter Eisentraut
2019-01-25 11:27:59 +01:00
parent e3565fd61c
commit 7c079d7417
14 changed files with 315 additions and 168 deletions
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5
src/backend/parser/parse_expr.c
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@ -1843,6 +1843,9 @@ transformSubLink(ParseState *pstate, SubLink *sublink)
case EXPR_KIND_TRIGGER_WHEN:
err = _("cannot use subquery in trigger WHEN condition");
break;
case EXPR_KIND_PARTITION_BOUND:
err = _("cannot use subquery in partition bound");
break;
case EXPR_KIND_PARTITION_EXPRESSION:
err = _("cannot use subquery in partition key expression");
break;
@ -3474,6 +3477,8 @@ ParseExprKindName(ParseExprKind exprKind)
return "EXECUTE";
case EXPR_KIND_TRIGGER_WHEN:
return "WHEN";
case EXPR_KIND_PARTITION_BOUND:
return "partition bound";
case EXPR_KIND_PARTITION_EXPRESSION:
return "PARTITION BY";
case EXPR_KIND_CALL_ARGUMENT: