com.yahoo.bard.webservice.sql.evaluator

Class FilterEvaluator

java.lang.Object

com.yahoo.bard.webservice.sql.evaluator.FilterEvaluator

All Implemented Interfaces:

org.apache.calcite.util.ReflectiveVisitor

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

Evaluates filters to find all the dimensions used in them and to build a RexNode with an equivalent sql filter. To use this call evaluateFilter(Filter, RelBuilder, ApiToFieldMapper).

Constructor Summary

Constructors

Constructor and Description
FilterEvaluator() Constructor.

Method Summary

Modifier and Type	Method and Description
org.apache.calcite.rex.RexNode	evaluate(AndFilter andFilter, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Evaluates an AndFilter.
org.apache.calcite.rex.RexNode	evaluate(Filter filter, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Top level evaluate call meant to capture Filter which could not be mapped to a specific "evaluate" method.
org.apache.calcite.rex.RexNode	evaluate(InFilter inFilter, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Evaluates an Infilter filter.
org.apache.calcite.rex.RexNode	evaluate(NotFilter notFilter, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Evaluates an NotFilter.
org.apache.calcite.rex.RexNode	evaluate(OrFilter orFilter, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Evaluates an OrFilter.
org.apache.calcite.rex.RexNode	evaluate(RegularExpressionFilter regexFilter, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Evaluates a regular expression filter.
org.apache.calcite.rex.RexNode	evaluate(SearchFilter searchFilter, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Evaluates a SearchFilter filter.
org.apache.calcite.rex.RexNode	evaluate(SelectorFilter selectorFilter, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Evaluates a Selector filter.
org.apache.calcite.rex.RexNode	evaluateFilter(Filter filter, org.apache.calcite.tools.RelBuilder builder, ApiToFieldMapper apiToFieldMapper) Evaluates and builds a filter and finds all the dimension names used in all filters.

Methods inherited from class java.lang.Object

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

Constructor Detail

FilterEvaluator

public FilterEvaluator()

Constructor.

Method Detail

evaluateFilter

public org.apache.calcite.rex.RexNode evaluateFilter(Filter filter,
                                                     org.apache.calcite.tools.RelBuilder builder,
                                                     ApiToFieldMapper apiToFieldMapper)

Evaluates and builds a filter and finds all the dimension names used in all filters.

Parameters:

filter - The filter to be evaluated.

builder - The RelBuilder used to build queries with Calcite.

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

Returns:

a RexNode containing an equivalent filter to the one given.

Throws:

UnsupportedOperationException - for filters which couldn't be evaluated.

evaluate

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

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

Parameters:

filter - The filter to be evaluated.

builder - The RelBuilder used to build queries with Calcite.

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

Returns:

only throws exception.

Throws:

UnsupportedOperationException - for filters which couldn't be evaluated.

evaluate

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

Evaluates a regular expression filter.

Parameters:

regexFilter - A regexFilter to be evaluated.

builder - The RelBuilder used to build queries with Calcite.

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

Returns:

a RexNode containing an equivalent filter to the one given.

evaluate

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

Evaluates a Selector filter.

Parameters:

selectorFilter - A selectorFilter to be evaluated.

builder - The RelBuilder used to build queries with Calcite.

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

Returns:

a RexNode containing an equivalent filter to the one given.

evaluate

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

Evaluates a SearchFilter filter. Currently doesn't support Fragment mode.

Parameters:

searchFilter - A searchFilter to be evaluated.

builder - The RelBuilder used to build queries with Calcite.

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

Returns:

a RexNode containing an equivalent filter to the one given.

evaluate

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

Evaluates an Infilter filter.

Parameters:

inFilter - An inFilter to be evaluated.

builder - The RelBuilder used to build queries with Calcite.

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

Returns:

a RexNode containing an equivalent filter to the one given.

evaluate

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

Evaluates an OrFilter.

Parameters:

orFilter - An orFilter to be evaluated.

builder - The RelBuilder used to build queries with Calcite.

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

Returns:

a RexNode containing an equivalent filter which ORs over the inner filters.

evaluate

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

Evaluates an AndFilter.

Parameters:

andFilter - An andFilter to be evaluated.

builder - The RelBuilder used to build queries with Calcite.

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

Returns:

a RexNode containing an equivalent filter which ANDs over the inner filters.

evaluate

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

Evaluates an NotFilter.

Parameters:

notFilter - An notFilter to be evaluated.

builder - The RelBuilder used to build queries with Calcite.

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

Returns:

a RexNode containing an equivalent filter which NOTs over the inner filters.