Package com.pervasive.datarush.operators.select

Provides operators for selecting a subset of the data set.

See: Description

Class Summary

Class	Description
FilterRows	Filters records based on a specified predicate.
LimitRows	Truncates a flow to a fixed number of records.
SampleRandomRows	Apply random sampling to the input data.

Enum Summary

Enum	Description
SampleMode	The mode to use when applying random sampling.

Package com.pervasive.datarush.operators.select Description

Provides operators for selecting a subset of the data set. Selection can be performed on various criteria:

• whether a record meets some given requirement, expressed as a logical predicate. Logical predicates are defined as ScalarValuedFunctions which return a boolean result; a number of common predicates are predefined in Predicates.
• whether a record falls within a given range of rows, based on position. Note that position is order-dependent; use on unordered data will yield non-deterministic results.

Random sampling of the data is also supported.

For operators which select a subset of fields from a record, refer to the operators in the record package.