com.yahoo.bard.webservice.sql.evaluator

Class HavingEvaluator

java.lang.Object

com.yahoo.bard.webservice.sql.evaluator.HavingEvaluator

All Implemented Interfaces:

org.apache.calcite.util.ReflectiveVisitor

public class HavingEvaluator
extends Object
implements org.apache.calcite.util.ReflectiveVisitor

Evaluates Having filters on aggregated metrics to build an equivalent RexNode for making a sql query. To use this call evaluateHaving(Having, RelBuilder, ApiToFieldMapper).

Constructor Summary

Constructors

Constructor and Description
HavingEvaluator() Constructor.

Method Summary

Modifier and Type	Method and Description
org.apache.calcite.rex.RexNode	evaluate(AndHaving andHaving, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Evaluates a AndHaving.
org.apache.calcite.rex.RexNode	evaluate(Having having, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Top level evaluate function meant to capture Having which could not be mapped to a specific "evaluate" method.
org.apache.calcite.rex.RexNode	evaluate(NotHaving notHaving, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Evaluates a NotHaving filter.
org.apache.calcite.rex.RexNode	evaluate(NumericHaving having, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Evaluates a NumericHaving.
org.apache.calcite.rex.RexNode	evaluate(OrHaving orHaving, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Evaluates a OrHaving.
org.apache.calcite.rex.RexNode	evaluateHaving(Having having, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Creates an RexNode which contains the given Having.
org.apache.calcite.rex.RexNode	listEvaluate(MultiClauseHaving multiClauseHaving, org.apache.calcite.sql.SqlOperator operator, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Evaluates a MultiClauseHaving filter by performing it's operation over a list of other havings.

Methods inherited from class java.lang.Object

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

Constructor Detail

HavingEvaluator

public HavingEvaluator()

Constructor.

Method Detail

evaluateHaving

public org.apache.calcite.rex.RexNode evaluateHaving(Having having,
                                                     org.apache.calcite.tools.RelBuilder builder,
                                                     ApiToFieldMapper apiToFieldMapper)

Creates an RexNode which contains the given Having.

Parameters:

having - The having filter being evaluated.

builder - The RelBuilder used with Calcite to make queries.

apiToFieldMapper - A function to get the aliased aggregation's name from the metric name.

Returns:

the equivalent RexNode to be used in a sql query.

Throws:

UnsupportedOperationException - for havings which couldn't be evaluated.

evaluate

public org.apache.calcite.rex.RexNode evaluate(Having having,
                                               org.apache.calcite.tools.RelBuilder builder,
                                               ApiToFieldMapper apiToFieldMapper)

Top level evaluate function meant to capture Having which could not be mapped to a specific "evaluate" method.

Parameters:

having - The having filter being evaluated.

builder - The RelBuilder used with Calcite to make queries.

apiToFieldMapper - A function to get the aliased aggregation's name from the metric name.

Returns:

only throws exception.

Throws:

UnsupportedOperationException - for havings which couldn't be evaluated.

evaluate

public org.apache.calcite.rex.RexNode evaluate(NumericHaving having,
                                               org.apache.calcite.tools.RelBuilder builder,
                                               ApiToFieldMapper apiToFieldMapper)

Evaluates a NumericHaving.

Parameters:

having - The NumericHaving filter to be evaluated.

builder - The RelBuilder used with Calcite to make queries.

apiToFieldMapper - A function to get the aliased aggregation's name from the metric name.

Returns:

the equivalent RexNode to be used in a sql query.

evaluate

public org.apache.calcite.rex.RexNode evaluate(NotHaving notHaving,
                                               org.apache.calcite.tools.RelBuilder builder,
                                               ApiToFieldMapper apiToFieldMapper)

Evaluates a NotHaving filter.

Parameters:

notHaving - The not having filter to be converted to be evaluated.

builder - The RelBuilder used with Calcite to make queries.

apiToFieldMapper - A function to get the aliased aggregation's name from the metric name.

Returns:

the equivalent RexNode to be used in a sql query.

evaluate

public org.apache.calcite.rex.RexNode evaluate(OrHaving orHaving,
                                               org.apache.calcite.tools.RelBuilder builder,
                                               ApiToFieldMapper apiToFieldMapper)

Evaluates a OrHaving.

Parameters:

orHaving - The OrHaving to be evaluated.

builder - The RelBuilder used with Calcite to make queries.

apiToFieldMapper - A function to get the aliased aggregation's name from the metric name.

Returns:

the equivalent RexNode to be used which ORs over the inner havings.

evaluate

public org.apache.calcite.rex.RexNode evaluate(AndHaving andHaving,
                                               org.apache.calcite.tools.RelBuilder builder,
                                               ApiToFieldMapper apiToFieldMapper)

Evaluates a AndHaving.

Parameters:

andHaving - The AndHaving to be evaluated.

builder - The RelBuilder used with Calcite to make queries.

apiToFieldMapper - A function to get the aliased aggregation's name from the metric name.

Returns:

the equivalent RexNode to be used which ANDs over the inner havings.

listEvaluate

public org.apache.calcite.rex.RexNode listEvaluate(MultiClauseHaving multiClauseHaving,
                                                   org.apache.calcite.sql.SqlOperator operator,
                                                   org.apache.calcite.tools.RelBuilder builder,
                                                   ApiToFieldMapper apiToFieldMapper)

Evaluates a MultiClauseHaving filter by performing it's operation over a list of other havings.

Parameters:

multiClauseHaving - The MultiClauseHaving filter to be evaluated.

operator - The operator to be performed over the inner clauses of this having filter.

builder - The RelBuilder used with Calcite to make queries.

apiToFieldMapper - A function to get the aliased aggregation's name from the metric name.

Returns:

the equivalent RexNode to be used in a sql query.