org.apache.hadoop.hive.ql.optimizer.calcite.stats

Class HiveRelMdColumnUniqueness

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.calcite.stats.HiveRelMdColumnUniqueness

All Implemented Interfaces:

org.apache.calcite.rel.metadata.MetadataHandler<org.apache.calcite.rel.metadata.BuiltInMetadata.ColumnUniqueness>

public final class HiveRelMdColumnUniqueness
extends Object
implements org.apache.calcite.rel.metadata.MetadataHandler<org.apache.calcite.rel.metadata.BuiltInMetadata.ColumnUniqueness>

HiveRelMdColumnUniqueness implements the ability to get unique keys for table scan op.

Field Summary

Fields

Modifier and Type	Field and Description
static org.apache.calcite.rel.metadata.RelMetadataProvider	SOURCE

Method Summary

Modifier and Type	Method and Description
Boolean	areColumnsUnique(HiveTableScan rel, org.apache.calcite.rel.metadata.RelMetadataQuery mq, org.apache.calcite.util.ImmutableBitSet columns, boolean ignoreNulls)
org.apache.calcite.rel.metadata.MetadataDef<org.apache.calcite.rel.metadata.BuiltInMetadata.ColumnUniqueness>	getDef()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

SOURCE

public static final org.apache.calcite.rel.metadata.RelMetadataProvider SOURCE

Method Detail

getDef

public org.apache.calcite.rel.metadata.MetadataDef<org.apache.calcite.rel.metadata.BuiltInMetadata.ColumnUniqueness> getDef()

Specified by:

getDef in interface org.apache.calcite.rel.metadata.MetadataHandler<org.apache.calcite.rel.metadata.BuiltInMetadata.ColumnUniqueness>

areColumnsUnique

public Boolean areColumnsUnique(HiveTableScan rel,
                                org.apache.calcite.rel.metadata.RelMetadataQuery mq,
                                org.apache.calcite.util.ImmutableBitSet columns,
                                boolean ignoreNulls)