{
  "B": {"column": "equipment_version.create_time", "type": "DATETIME", "precision": 0, "observed_version_time_fields": 11, "original_length19": 11, "zero_fraction_fields": 0},
  "C": {"column": "equipment_version.create_time", "type": "DATETIME", "precision": 6, "observed_version_time_fields": 11, "original_length19": 0, "zero_fraction_fields": 11},
  "unknown_or_nonzero_fraction_fields_in_sample": 0,
  "final_C_source26_to_wire19_fields": 11,
  "final_B_unchanged19_fields": 11,
  "normalization": "DM-only; valid calendar and clock; only all-zero fractional suffix up to 6 digits",
  "nonzero_fraction_semantics_closed": false,
  "source_queries_are_metadata_only": true
}