class_docstr: Concatenates record arrays and/or adds new columns
class_docstr_tok: ["Concatenates","record","arrays","and\/or","adds","new","columns"]
code: def order(self):
      return [
          str(self.tree.topLevelItem(i).text(0))
          for i in range(self.tree.topLevelItemCount())
      ]
  
imports: import numpy
  from ...graphicsItems.LinearRegionItem import LinearRegionItem
  from ...Qt import QtCore, QtWidgets
  from ...widgets.TreeWidget import TreeWidget
  from ..Node import Node
  from .None import functions
  from .common import CtrlNode
label_desc: Use image node_id 6 for calling the ColumnJoinNode obj's underlying member method code with example usage: obj.order() and returns: unknown