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Make clear that IsTableLocallyAccessible is only for citus local tables (#5075) 

The name and comment of this function did not indicate that it only
really could detect locally accessible citus local tables. This fixes
that, while also cleaning up the function a bit.
pull/4994/head
Jelte Fennema 2021-06-28 11:47:21 +02:00 committed by GitHub
parent fe5907ad2d
commit 802225940e
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 13 additions and 14 deletions
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27
src/backend/distributed/planner/multi_router_planner.c
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@ -174,7 +174,7 @@ static void ReorderTaskPlacementsByTaskAssignmentPolicy(Job *job,
List *placementList);
static bool ModifiesLocalTableWithRemoteCitusLocalTable(List *rangeTableList);
static DeferredErrorMessage * DeferErrorIfUnsupportedLocalTableJoin(List *rangeTableList);
static bool IsTableLocallyAccessible(Oid relationId);
static bool IsLocallyAccessibleCitusLocalTable(Oid relationId);
/*
@ -794,7 +794,7 @@ ModifiesLocalTableWithRemoteCitusLocalTable(List *rangeTableList)
}
if (IsCitusTableType(rangeTableEntry->relid, CITUS_LOCAL_TABLE))
{
if (!IsTableLocallyAccessible(rangeTableEntry->relid))
if (!IsLocallyAccessibleCitusLocalTable(rangeTableEntry->relid))
{
containsRemoteCitusLocalTable = true;
}
@ -809,19 +809,23 @@ ModifiesLocalTableWithRemoteCitusLocalTable(List *rangeTableList)
/*
* IsTableLocallyAccessible returns true if the given table
* can be accessed in local.
* IsLocallyAccessibleCitusLocalTable returns true if the given table
* is a citus local table that can be accessed using local execution.
*/
static bool
IsTableLocallyAccessible(Oid relationId)
IsLocallyAccessibleCitusLocalTable(Oid relationId)
{
if (!IsCitusTable(relationId))
if (!IsCitusTableType(relationId, CITUS_LOCAL_TABLE))
{
/* local tables are locally accessible */
return true;
return false;
}
List *shardIntervalList = LoadShardIntervalList(relationId);
/*
* Citus local tables should always have exactly one shard, but we have
* this check for safety.
*/
if (list_length(shardIntervalList) != 1)
{
return false;
@ -831,12 +835,7 @@ IsTableLocallyAccessible(Oid relationId)
uint64 shardId = shardInterval->shardId;
ShardPlacement *localShardPlacement =
ShardPlacementOnGroup(shardId, GetLocalGroupId());
if (localShardPlacement != NULL)
{
/* the table has a placement on this node */
return true;
}
return false;
return localShardPlacement != NULL;
}