code: def _parse_error(hstore_str, pos):
      """format an unmarshalling error."""
  
      ctx = 20
      hslen = len(hstore_str)
  
      parsed_tail = hstore_str[max(pos - ctx - 1, 0) : min(pos, hslen)]
      residual = hstore_str[min(pos, hslen) : min(pos + ctx + 1, hslen)]
  
      if len(parsed_tail) > ctx:
          parsed_tail = "[...]" + parsed_tail[1:]
      if len(residual) > ctx:
          residual = residual[:-1] + "[...]"
  
      return "After %r, could not parse residual at position %d: %r" % (
          parsed_tail,
          pos,
          residual,
      )
  
imports: import re
  from .array import ARRAY
  from .operators import CONTAINED_BY
  from .operators import CONTAINS
  from .operators import GETITEM
  from .operators import HAS_ALL
  from .operators import HAS_ANY
  from .operators import HAS_KEY
  from ...None import types
  from ...sql import functions
label_desc: Use image node_id 1 for calling a global function with example usage: _parse_error(hstore_str, pos) and returns: unknown