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

Class HiveRewriteToDataSketchesRules.CountDistinctRewrite

java.lang.Object

org.apache.calcite.plan.RelOptRule

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

Enclosing class:

HiveRewriteToDataSketchesRules

public static class HiveRewriteToDataSketchesRules.CountDistinctRewrite
extends org.apache.calcite.plan.RelOptRule

Rewrites count(distinct(x)) to distinct counting sketches.

   SELECT COUNT(DISTINCT id) FROM sketch_input;
   ⇒ SELECT ROUND(ds_hll_estimate(ds_hll_sketch(id))) FROM sketch_input;
 

Nested Class Summary

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
CountDistinctRewrite(String sketchType)

Method Summary

Modifier and Type	Method and Description
protected org.apache.hadoop.hive.ql.optimizer.calcite.rules.HiveRewriteToDataSketchesRules.CountDistinctRewrite.VBuilderPAP	processCall(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

CountDistinctRewrite

public CountDistinctRewrite(String sketchType)

Method Detail

processCall

protected org.apache.hadoop.hive.ql.optimizer.calcite.rules.HiveRewriteToDataSketchesRules.CountDistinctRewrite.VBuilderPAP processCall(org.apache.calcite.plan.RelOptRuleCall call)