// GetRangeTree fetches the RangeTree proto and sets up the range tree context.
func getRangeTree(txn *client.Txn) (*treeContext, *roachpb.Error) {
tree := new(RangeTree)
if pErr := txn.GetProto(keys.RangeTreeRoot, tree); pErr != nil {
return nil, pErr
}
return &treeContext{
txn: txn,
tree: tree,
dirty: false,
nodes: map[string]cachedNode{},
}, nil
}
// GetRangeTree fetches the RangeTree proto and sets up the range tree context.
func getRangeTree(txn *client.Txn) (*treeContext, error) {
tree := &proto.RangeTree{}
if err := txn.GetProto(keys.RangeTreeRoot, tree); err != nil {
return nil, err
}
return &treeContext{
txn: txn,
tree: tree,
dirty: false,
nodes: map[string]cachedNode{},
}, nil
}
// get the table descriptor for the ID passed in using the planner's txn.
func getTableDescFromID(txn *client.Txn, id ID) (*TableDescriptor, *roachpb.Error) {
desc := &Descriptor{}
descKey := MakeDescMetadataKey(id)
if pErr := txn.GetProto(descKey, desc); pErr != nil {
return nil, pErr
}
tableDesc := desc.GetTable()
if tableDesc == nil {
return nil, roachpb.NewErrorf("ID %d is not a table", id)
}
return tableDesc, nil
}
// getTableDescFromID retrieves the table descriptor for the table
// ID passed in using an existing txn. Teturns an error if the
// descriptor doesn't exist or if it exists and is not a table.
func getTableDescFromID(txn *client.Txn, id sqlbase.ID) (*sqlbase.TableDescriptor, error) {
desc := &sqlbase.Descriptor{}
descKey := sqlbase.MakeDescMetadataKey(id)
if err := txn.GetProto(descKey, desc); err != nil {
return nil, err
}
table := desc.GetTable()
if table == nil {
return nil, errDescriptorNotFound
}
return table, nil
}