code: public Schema schema(TableSchema schema) {
  		tableSchema.clear();
  		lastField = null;
  		for (int i = 0; i < schema.getFieldCount(); i++) {
  			field(schema.getFieldName(i).get(), schema.getFieldType(i).get());
  		}
  		return this;
  	}
docs: Sets the schema with field names and the types. Required.
  
  <p>This method overwrites existing fields added with {@link #field(String, TypeInformation)}.
  
  @param schema the table schema