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Factor error generation out of ExecPartitionCheck.

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At present, we always raise an ERROR if the partition constraint
is violated, but a pending patch for UPDATE tuple routing will
consider instead moving the tuple to the correct partition.
Refactor to make that simpler.

Amit Khandekar, reviewed by Amit Langote, David Rowley, and me.

Discussion: http://postgr.es/m/CAJ3gD9cue54GbEzfV-61nyGpijvjZgCcghvLsB0_nL8Nm8HzCA@mail.gmail.com
This commit is contained in:
Robert Haas
2018-01-05 15:18:03 -05:00
parent 84a6f63e32
commit 19c47e7c82
6 changed files with 73 additions and 54 deletions
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105
src/backend/executor/execMain.c
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@ -1849,16 +1849,12 @@ ExecRelCheck(ResultRelInfo *resultRelInfo,
* ExecPartitionCheck --- check that tuple meets the partition constraint.
*
* Exported in executor.h for outside use.
* Returns true if it meets the partition constraint, else returns false.
*/
void
bool
ExecPartitionCheck(ResultRelInfo *resultRelInfo, TupleTableSlot *slot,
EState *estate)
{
Relation rel = resultRelInfo->ri_RelationDesc;
TupleDesc tupdesc = RelationGetDescr(rel);
Bitmapset *modifiedCols;
Bitmapset *insertedCols;
Bitmapset *updatedCols;
ExprContext *econtext;
/*
@ -1886,52 +1882,69 @@ ExecPartitionCheck(ResultRelInfo *resultRelInfo, TupleTableSlot *slot,
* As in case of the catalogued constraints, we treat a NULL result as
* success here, not a failure.
*/
if (!ExecCheck(resultRelInfo->ri_PartitionCheckExpr, econtext))
return ExecCheck(resultRelInfo->ri_PartitionCheckExpr, econtext);
}
/*
* ExecPartitionCheckEmitError - Form and emit an error message after a failed
* partition constraint check.
*/
void
ExecPartitionCheckEmitError(ResultRelInfo *resultRelInfo,
TupleTableSlot *slot,
EState *estate)
{
Relation rel = resultRelInfo->ri_RelationDesc;
Relation orig_rel = rel;
TupleDesc tupdesc = RelationGetDescr(rel);
char *val_desc;
Bitmapset *modifiedCols;
Bitmapset *insertedCols;
Bitmapset *updatedCols;
/*
* Need to first convert the tuple to the root partitioned table's row
* type. For details, check similar comments in ExecConstraints().
*/
if (resultRelInfo->ri_PartitionRoot)
{
char *val_desc;
Relation orig_rel = rel;
HeapTuple tuple = ExecFetchSlotTuple(slot);
TupleDesc old_tupdesc = RelationGetDescr(rel);
TupleConversionMap *map;
/* See the comment above. */
if (resultRelInfo->ri_PartitionRoot)
rel = resultRelInfo->ri_PartitionRoot;
tupdesc = RelationGetDescr(rel);
/* a reverse map */
map = convert_tuples_by_name(old_tupdesc, tupdesc,
gettext_noop("could not convert row type"));
if (map != NULL)
{
HeapTuple tuple = ExecFetchSlotTuple(slot);
TupleDesc old_tupdesc = RelationGetDescr(rel);
TupleConversionMap *map;
rel = resultRelInfo->ri_PartitionRoot;
tupdesc = RelationGetDescr(rel);
/* a reverse map */
map = convert_tuples_by_name(old_tupdesc, tupdesc,
gettext_noop("could not convert row type"));
if (map != NULL)
{
tuple = do_convert_tuple(tuple, map);
ExecSetSlotDescriptor(slot, tupdesc);
ExecStoreTuple(tuple, slot, InvalidBuffer, false);
}
tuple = do_convert_tuple(tuple, map);
ExecSetSlotDescriptor(slot, tupdesc);
ExecStoreTuple(tuple, slot, InvalidBuffer, false);
}
insertedCols = GetInsertedColumns(resultRelInfo, estate);
updatedCols = GetUpdatedColumns(resultRelInfo, estate);
modifiedCols = bms_union(insertedCols, updatedCols);
val_desc = ExecBuildSlotValueDescription(RelationGetRelid(rel),
slot,
tupdesc,
modifiedCols,
64);
ereport(ERROR,
(errcode(ERRCODE_CHECK_VIOLATION),
errmsg("new row for relation \"%s\" violates partition constraint",
RelationGetRelationName(orig_rel)),
val_desc ? errdetail("Failing row contains %s.", val_desc) : 0));
}
insertedCols = GetInsertedColumns(resultRelInfo, estate);
updatedCols = GetUpdatedColumns(resultRelInfo, estate);
modifiedCols = bms_union(insertedCols, updatedCols);
val_desc = ExecBuildSlotValueDescription(RelationGetRelid(rel),
slot,
tupdesc,
modifiedCols,
64);
ereport(ERROR,
(errcode(ERRCODE_CHECK_VIOLATION),
errmsg("new row for relation \"%s\" violates partition constraint",
RelationGetRelationName(orig_rel)),
val_desc ? errdetail("Failing row contains %s.", val_desc) : 0));
}
/*
* ExecConstraints - check constraints of the tuple in 'slot'
*
* This checks the traditional NOT NULL and check constraints, as well as
* the partition constraint, if any.
* This checks the traditional NOT NULL and check constraints, and if
* requested, checks the partition constraint.
*
* Note: 'slot' contains the tuple to check the constraints of, which may
* have been converted from the original input tuple after tuple routing.
@ -1939,7 +1952,8 @@ ExecPartitionCheck(ResultRelInfo *resultRelInfo, TupleTableSlot *slot,
*/
void
ExecConstraints(ResultRelInfo *resultRelInfo,
TupleTableSlot *slot, EState *estate)
TupleTableSlot *slot, EState *estate,
bool check_partition_constraint)
{
Relation rel = resultRelInfo->ri_RelationDesc;
TupleDesc tupdesc = RelationGetDescr(rel);
@ -2055,8 +2069,9 @@ ExecConstraints(ResultRelInfo *resultRelInfo,
}
}
if (resultRelInfo->ri_PartitionCheck)
ExecPartitionCheck(resultRelInfo, slot, estate);
if (check_partition_constraint && resultRelInfo->ri_PartitionCheck &&
!ExecPartitionCheck(resultRelInfo, slot, estate))
ExecPartitionCheckEmitError(resultRelInfo, slot, estate);
}