Package org.apache.flink.table.api

Interface OverWindowedTable

  • @PublicEvolving
public interface OverWindowedTable
    A table that has been windowed for OverWindows.

    Unlike group windows, which are specified in the GROUP BY clause, over windows do not collapse rows. Instead over window aggregates compute an aggregate for each input row over a range of its neighboring rows.

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      Table select​(org.apache.flink.table.expressions.Expression... fields)
      Performs a selection operation on a over windowed table.

    • Method Detail

      • select

        Table select​(org.apache.flink.table.expressions.Expression... fields)
        Performs a selection operation on a over windowed table. Similar to an SQL SELECT statement. The field expressions can contain complex expressions and aggregations.

        Example: 

        
 overWindowedTable.select(
    $("c"),
    $("b").count().over($("ow")),
    $("e").sum().over($("ow"))
 );

        Scala Example: 

        
 overWindowedTable.select('c, 'b.count over 'ow, 'e.sum over 'ow)