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What Are The Window Functions Provided By Apache Tajo?

Answer»

The functions that execute on a set of rows and RETURN a single value for each row are Window functions. The Window FUNCTION in a query, defines the window using the OVER() clause.

The OVER() clause has the following capabilities:

  • Defines window PARTITIONS to form groups of rows. (PARTITION BY clause)
  • Orders rows within a partition. (ORDER BY clause)

Some of the window functions are:

  • rank()
  • row_num()
  • lead(value[, offset integer[, default any]])
  • lag(value[, offset integer[, default any]])
  • first_value(value)
  • last_value(value)

The functions that execute on a set of rows and return a single value for each row are Window functions. The Window function in a query, defines the window using the OVER() clause.

The OVER() clause has the following capabilities:

Some of the window functions are:


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