Defining Fields for Writing to Hive File

In the Fields tab of the Write to Hive File stage, the schema names and datatypes of the fields in the input data to the stage are listed.

  1. To select the desired fields from the input data, or an existing file, click Quick Add.
    1. Select the specific fields from the input data.
    2. Click OK.
  2. To add new fields, click Add.
    1. Enter the Name of the field.
    2. Select the Type of the field. The stage supports the following data types:
      boolean
      A logical type with two values: true and false.
      date
      A data type that contains a month, day, and year. For example, 2012-01-30 or January 30, 2012. You can specify a default date format in Management Console.
      datetime
      A data type that contains a month, day, year, and hours, minutes, and seconds. For example, 2012/01/30 6:15:00 PM.
      Note: In Parquet files, datetime and time datatypes are mapped as String. In RC files, datetime datatype is mapped as timestamp.
      double
      A numeric data type that contains both negative and positive double precision numbers between 2-1074 and (2-2-52)×21023. In E notation, the range of values is -1.79769313486232E+308 to 1.79769313486232E+308.
      float
      A numeric data type that contains both negative and positive single precision numbers between 2-149 and (2-223)×2127. In E notation, the range of values -3.402823E+38 to 3.402823E+38.
      integer
      A numeric data type that contains both negative and positive whole numbers between -231 (-2,147,483,648) and 231-1 (2,147,483,647).
      bigdecimal
      A numeric data type that supports 38 decimal points of precision. Use this data type for data that will be used in mathematical calculations requiring a high degree of precision, especially those involving financial data. The bigdecimal data type supports more precise calculations than the double data type.
      Note: For RC, Avro, and Parquet Hive files, the bigdecimal datatype is converted to a decimal datatype with precision 38 and scale 10.;
      long
      A numeric data type that contains both negative and positive whole numbers between -263 (-9,223,372,036,854,775,808) and 263-1 (9,223,372,036,854,775,807).
      Note: In RC files, the long datatype is mapped as bigint datatype.
      string
      A sequence of characters.
    3. In the Position field, enter the position of this field within the record.

      For example, in this input file, AddressLine1 is in position 1, City is in position 2, StateProvince is in position 3, and PostalCode is in position 4.

      "AddressLine1"|"City"|"StateProvince"|"PostalCode"
"7200 13TH ST"|"MIAMI"|"FL"|"33144"
"One Global View"|"Troy"|"NY"|12180
  3. If you're overwriting an existing file, click Regenerate to pick the schema from the existing file, and then modify it.
    This generates the schema based on the metadata of the existing file, in case of ORC and Parquet output files. For RC output files, you must add the fields explicitly to overwrite existing fields.

    The Name column lists the names of the various columns of the input data. The Type column lists the datatypes of each respective field of the input data.

    Note: In case of Parquet file type, another column Nullable indicates whether the field is nullable or not. You can check this checkbox for a particular field to make the field nullable, or uncheck it otherwise.
  4. You can modify the names, datatypes and sequence of the selected columns in the output using the below buttons:

    Option Name

    Description

    Add

    Adds a field to the output.

    Modify

    Modifies the selected field's name and datatype.

    Remove

    Removes the selected field from the output.

    Move Up/Move Down

    Reorders the position of the selected field in the output.
  5. Click OK.