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Teach \d+ to show partitioning constraints.

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The fact that we didn't have this in the first place is likely why
the problem fixed by f8bffe9e6d
escaped detection.

Patch by Amit Langote, reviewed and slightly adjusted by me.

Discussion: http://postgr.es/m/CA+TgmoYWnV2GMnYLG-Czsix-E1WGAbo4D+0tx7t9NdfYBDMFsA@mail.gmail.com
This commit is contained in:
Robert Haas
2017-05-13 12:04:53 -04:00
parent f8bffe9e6d
commit 1848b73d45
9 changed files with 193 additions and 22 deletions
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32
src/backend/utils/adt/ruleutils.c
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@ -24,6 +24,7 @@
#include "access/sysattr.h"
#include "catalog/dependency.h"
#include "catalog/indexing.h"
#include "catalog/partition.h"
#include "catalog/pg_aggregate.h"
#include "catalog/pg_am.h"
#include "catalog/pg_authid.h"
@ -1728,6 +1729,37 @@ pg_get_partkeydef_worker(Oid relid, int prettyFlags,
return buf.data;
}
/*
* pg_get_partition_constraintdef
*
* Returns partition constraint expression as a string for the input relation
*/
Datum
pg_get_partition_constraintdef(PG_FUNCTION_ARGS)
{
Oid relationId = PG_GETARG_OID(0);
Expr *constr_expr;
int prettyFlags;
List *context;
char *consrc;
constr_expr = get_partition_qual_relid(relationId);
/* Quick exit if not a partition */
if (constr_expr == NULL)
PG_RETURN_NULL();
/*
* Deparse and return the constraint expression.
*/
prettyFlags = PRETTYFLAG_INDENT;
context = deparse_context_for(get_relation_name(relationId), relationId);
consrc = deparse_expression_pretty((Node *) constr_expr, context, false,
false, prettyFlags, 0);
PG_RETURN_TEXT_P(string_to_text(consrc));
}
/*
* pg_get_constraintdef
*