public interface Statistic
Table
.
Each of the methods may return null
meaning "not known".
Statistics
Modifier and Type | Method and Description |
---|---|
java.util.List<RelCollation> |
getCollations()
Returns the collections of columns on which this table is sorted.
|
RelDistribution |
getDistribution()
Returns the distribution of the data in this table.
|
java.util.List<RelReferentialConstraint> |
getReferentialConstraints()
Returns the collection of referential constraints (foreign-keys)
for this table.
|
java.lang.Double |
getRowCount()
Returns the approximate number of rows in the table.
|
boolean |
isKey(ImmutableBitSet columns)
Returns whether the given set of columns is a unique key, or a superset
of a unique key, of the table.
|
java.lang.Double getRowCount()
boolean isKey(ImmutableBitSet columns)
java.util.List<RelReferentialConstraint> getReferentialConstraints()
java.util.List<RelCollation> getCollations()
RelDistribution getDistribution()
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