Package org.apache.cassandra.cql3.functions

Class AggregateFcts

java.lang.Object
org.apache.cassandra.cql3.functions.AggregateFcts
public abstract class AggregateFcts extends Object
Factory methods for aggregate functions.

  • Field Details

    • countRowsFunction

      public static final AggregateFcts.CountRowsFunction countRowsFunction
      The function used to count the number of rows of a result set. This function is called when COUNT(*) or COUNT(1) is specified.

    • sumFunctionForDecimal

      public static final NativeAggregateFunction sumFunctionForDecimal
      The SUM function for decimal values.

    • avgFunctionForDecimal

      public static final NativeAggregateFunction avgFunctionForDecimal
      The AVG function for decimal values.

      The average of an empty value set returns zero.

    • sumFunctionForVarint

      public static final NativeAggregateFunction sumFunctionForVarint
      The SUM function for varint values.

    • avgFunctionForVarint

      public static final NativeAggregateFunction avgFunctionForVarint
      The AVG function for varint values.

      The average of an empty value set returns zero. The returned value is of the same type as the input values, so the returned average won't have a decimal part.

    • sumFunctionForByte

      public static final NativeAggregateFunction sumFunctionForByte
      The SUM function for byte values (tinyint).

      The returned value is of the same type as the input values, so there is a risk of overflow if the sum of the values exceeds the maximum value that the type can represent.

    • avgFunctionForByte

      public static final NativeAggregateFunction avgFunctionForByte
      AVG function for byte values (tinyint).

      The average of an empty value set returns zero. The returned value is of the same type as the input values, so the returned average won't have a decimal part.

    • sumFunctionForShort

      public static final NativeAggregateFunction sumFunctionForShort
      The SUM function for short values (smallint).

      The returned value is of the same type as the input values, so there is a risk of overflow if the sum of the values exceeds the maximum value that the type can represent.

    • avgFunctionForShort

      public static final NativeAggregateFunction avgFunctionForShort
      AVG function for for short values (smallint).

      The average of an empty value set returns zero. The returned value is of the same type as the input values, so the returned average won't have a decimal part.

    • sumFunctionForInt32

      public static final NativeAggregateFunction sumFunctionForInt32
      The SUM function for int32 values.

      The returned value is of the same type as the input values, so there is a risk of overflow if the sum of the values exceeds the maximum value that the type can represent.

    • avgFunctionForInt32

      public static final NativeAggregateFunction avgFunctionForInt32
      AVG function for int32 values.

      The average of an empty value set returns zero. The returned value is of the same type as the input values, so the returned average won't have a decimal part.

    • sumFunctionForLong

      public static final NativeAggregateFunction sumFunctionForLong
      The SUM function for long values.

      The returned value is of the same type as the input values, so there is a risk of overflow if the sum of the values exceeds the maximum value that the type can represent.

    • avgFunctionForLong

      public static final NativeAggregateFunction avgFunctionForLong
      AVG function for long values.

      The average of an empty value set returns zero. The returned value is of the same type as the input values, so the returned average won't have a decimal part.

    • sumFunctionForFloat

      public static final NativeAggregateFunction sumFunctionForFloat
      The SUM function for float values.

      The returned value is of the same type as the input values, so there is a risk of overflow if the sum of the values exceeds the maximum value that the type can represent.

    • avgFunctionForFloat

      public static final NativeAggregateFunction avgFunctionForFloat
      AVG function for float values.

      The average of an empty value set returns zero.

    • sumFunctionForDouble

      public static final NativeAggregateFunction sumFunctionForDouble
      The SUM function for double values.

      The returned value is of the same type as the input values, so there is a risk of overflow if the sum of the values exceeds the maximum value that the type can represent.

    • avgFunctionForDouble

      public static final NativeAggregateFunction avgFunctionForDouble
      AVG function for double values.

      The average of an empty value set returns zero.

    • sumFunctionForCounter

      public static final NativeAggregateFunction sumFunctionForCounter
      The SUM function for counter column values.

    • avgFunctionForCounter

      public static final NativeAggregateFunction avgFunctionForCounter
      AVG function for counter column values.

    • minFunctionForCounter

      public static final NativeAggregateFunction minFunctionForCounter
      The MIN function for counter column values.

    • maxFunctionForCounter

      public static final NativeAggregateFunction maxFunctionForCounter
      MAX function for counter column values.

  • Constructor Details

    • AggregateFcts

      public AggregateFcts()

  • Method Details

    • addFunctionsTo

      public static void addFunctionsTo(NativeFunctions functions)

    • makeMaxFunction

      public static NativeAggregateFunction makeMaxFunction(AbstractType<?> inputType)
      Creates a MAX function for the specified type.
      Parameters:
      inputType - the function input and output type
      Returns:
      a MAX function for the specified type.

    • makeMinFunction

      public static NativeAggregateFunction makeMinFunction(AbstractType<?> inputType)
      Creates a MIN function for the specified type.
      Parameters:
      inputType - the function input and output type
      Returns:
      a MIN function for the specified type.

    • makeCountFunction

      public static NativeAggregateFunction makeCountFunction(AbstractType<?> inputType)
      Creates a COUNT function for the specified type.
      Parameters:
      inputType - the function input type
      Returns:
      a COUNT function for the specified type.