Raised (or returned) when a record or value cannot be turned into CSV without losing or inventing data.
BeamExport refuses to guess: lists, maps, tuples and other values without an
obvious text form must be converted explicitly in your :mapper, and headers
must match the records they extract from. The message never includes record
values, only types, positions and header names.
Fields:
:reason- one of:{:unsupported_value, type}- a field value has no CSV representation.{:invalid_row, type}- a record is not a list, tuple, map or struct.:map_without_headers- a map/struct record without:headersor:mapper.{:unknown_header, header, struct_module}- a header is not a field of the struct.{:no_matching_headers, headers}- none of the headers is a key of the map.
:row- 1-based data row (header row not counted), ornilfor the header row.:column- 1-based column, when known.