Package org.apache.calcite.profile

Interface Profiler

All Known Implementing Classes:

ProfilerImpl, SimpleProfiler

public interface Profiler

Analyzes data sets.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	Profiler.Column	Column.
static class	Profiler.Distribution	Value distribution, including cardinality and optionally values, of a column or set of columns.
static class	Profiler.FunctionalDependency	Functional dependency.
static class	Profiler.Profile	The result of profiling, contains various statistics about the data in a table.
static class	Profiler.RowCount	Whole data set.
static interface	Profiler.Statistic	Statistic produced by the profiler.
static class	Profiler.Unique	Unique key.

Method Summary

Modifier and Type	Method	Description
Profiler.Profile	profile(Iterable<List<Comparable>> rows, List<Profiler.Column> columns, Collection<ImmutableBitSet> initialGroups)	Creates a profile of a data set.

Method Details

profile

Profiler.Profile profile(Iterable<List<Comparable>> rows,
 List<Profiler.Column> columns,
 Collection<ImmutableBitSet> initialGroups)

Creates a profile of a data set.

Parameters:

rows - List of rows. Can be iterated over more than once (maybe not cheaply)

columns - Column definitions

initialGroups - List of combinations of columns that should be profiled early, because they may be interesting

Returns:

A profile describing relationships within the data set