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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _rows_from_json(values, schema):
 """Convert JSON row data to rows with appropriate types."""

    from google.cloud.bigquery import Row

    field_to_index = _field_to_index_mapping(schema)
    return [Row(_row_tuple_from_json(r, schema), field_to_index) for r in values]