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

Class HiveRewriteToDataSketchesRules.NTileRewrite

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.hadoop.hive.ql.optimizer.calcite.rules.HiveRewriteToDataSketchesRules.AbstractRankBasedRewriteRule

org.apache.hadoop.hive.ql.optimizer.calcite.rules.HiveRewriteToDataSketchesRules.NTileRewrite

Enclosing class:

HiveRewriteToDataSketchesRules

public static class HiveRewriteToDataSketchesRules.NTileRewrite
extends HiveRewriteToDataSketchesRules.AbstractRankBasedRewriteRule

Rewrites ntile(n) over (order by id).

   SELECT id, NTILE(4) OVER (ORDER BY id) FROM sketch_input;
     ⇒ SELECT id, CASE
                    WHEN CEIL(ds_kll_cdf(ds, CAST(id AS FLOAT) )[0]) < 1
                      THEN 1
                    ELSE CEIL(ds_kll_cdf(ds, CAST(id AS FLOAT) )[0])
                  END
       FROM sketch_input JOIN (
         SELECT ds_kll_sketch(CAST(id AS FLOAT)) AS ds FROM sketch_input
       ) q;
  

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.optimizer.calcite.rules.HiveRewriteToDataSketchesRules.AbstractRankBasedRewriteRule

HiveRewriteToDataSketchesRules.AbstractRankBasedRewriteRule.AbstractRankBasedRewriteBuilder

Nested classes/interfaces inherited from class org.apache.calcite.plan.RelOptRule

org.apache.calcite.plan.RelOptRule.ConverterRelOptRuleOperand

Field Summary

Fields inherited from class org.apache.calcite.plan.RelOptRule

description, operands, relBuilderFactory

Constructor Summary

Constructors

Constructor and Description
NTileRewrite(String sketchType)

Method Summary

Modifier and Type	Method and Description
protected HiveRewriteToDataSketchesRules.WindowingToProjectAggregateJoinProject.VbuilderPAP	buildProcessor(org.apache.calcite.plan.RelOptRuleCall call)

Methods inherited from class org.apache.calcite.plan.RelOptRule

any, convert, convert, convertList, convertOperand, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, operandJ, operandJ, some, toString, unordered

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

NTileRewrite

public NTileRewrite(String sketchType)

Method Detail

buildProcessor

protected HiveRewriteToDataSketchesRules.WindowingToProjectAggregateJoinProject.VbuilderPAP buildProcessor(org.apache.calcite.plan.RelOptRuleCall call)