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Recognize functional dependency on primary keys. This allows a table's

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other columns to be referenced without listing them in GROUP BY, so long as
the primary key column(s) are listed in GROUP BY.

Eventually we should also allow functional dependency on a UNIQUE constraint
when the columns are marked NOT NULL, but that has to wait until NOT NULL
constraints are represented in pg_constraint, because we need to have
pg_constraint OIDs for all the conditions needed to ensure functional
dependency.

Peter Eisentraut, reviewed by Alex Hunsaker and Tom Lane
This commit is contained in:
Tom Lane
2010-08-07 02:44:09 +00:00
parent ce6ce1a09d
commit e49ae8d3bc
16 changed files with 684 additions and 35 deletions
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3
src/backend/nodes/readfuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/readfuncs.c,v 1.232 2010/02/16 22:34:43 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/readfuncs.c,v 1.233 2010/08/07 02:44:07 tgl Exp $
*
* NOTES
* Path and Plan nodes do not have any readfuncs support, because we
@ -218,6 +218,7 @@ _readQuery(void)
READ_NODE_FIELD(limitCount);
READ_NODE_FIELD(rowMarks);
READ_NODE_FIELD(setOperations);
READ_NODE_FIELD(constraintDeps);
READ_DONE();
}