class_docstr: PipelineLoader for US Equity Pricing data
  
  Delegates loading of baselines and adjustments.
class_docstr_tok: ["PipelineLoader","for","US","Equity","Pricing","data","Delegates","loading","of","baselines","and","adjustments","."]
code: def columns(self):
      return self._columns
  
file_path: catalyst/catalyst/pipeline/loaders/equity_pricing_loader.py
imports: from numpy import iinfo, uint32
  from catalyst.data.us_equity_pricing import BcolzDailyBarReader, SQLiteAdjustmentReader
  from catalyst.lib.adjusted_array import AdjustedArray
  from catalyst.errors import NoFurtherDataError
  from catalyst.utils.calendars import get_calendar
  from .base import PipelineLoader
label_desc: Use image node_id 4 for calling the USEquityPricingLoader obj's underlying member method code with example usage: obj.columns() and returns: self