org.apache.hadoop.hive.ql.optimizer.calcite.stats.HiveRelMdCollation Maven / Gradle / Ivy
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package org.apache.hadoop.hive.ql.optimizer.calcite.stats;
import org.apache.calcite.rel.RelCollation;
import org.apache.calcite.rel.RelCollationTraitDef;
import org.apache.calcite.rel.RelFieldCollation;
import org.apache.calcite.rel.metadata.ChainedRelMetadataProvider;
import org.apache.calcite.rel.metadata.ReflectiveRelMetadataProvider;
import org.apache.calcite.rel.metadata.RelMdCollation;
import org.apache.calcite.rel.metadata.RelMetadataProvider;
import org.apache.calcite.util.BuiltInMethod;
import org.apache.hadoop.hive.ql.optimizer.calcite.HiveRelCollation;
import org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveAggregate;
import org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveJoin;
import com.google.common.collect.ImmutableList;
public class HiveRelMdCollation {
public static final RelMetadataProvider SOURCE =
ChainedRelMetadataProvider.of(
ImmutableList.of(
ReflectiveRelMetadataProvider.reflectiveSource(
BuiltInMethod.COLLATIONS.method, new HiveRelMdCollation()),
RelMdCollation.SOURCE));
//~ Constructors -----------------------------------------------------------
private HiveRelMdCollation() {}
//~ Methods ----------------------------------------------------------------
public ImmutableList collations(HiveAggregate aggregate) {
// Compute collations
ImmutableList.Builder collationListBuilder =
new ImmutableList.Builder();
for (int pos : aggregate.getGroupSet().asList()) {
final RelFieldCollation fieldCollation = new RelFieldCollation(pos);
collationListBuilder.add(fieldCollation);
}
// Return aggregate collations
return ImmutableList.of(
RelCollationTraitDef.INSTANCE.canonize(
new HiveRelCollation(collationListBuilder.build())));
}
public ImmutableList collations(HiveJoin join) {
return join.getCollation();
}
}