io.druid.sql.calcite.expression

Class ExpressionConverter

java.lang.Object

io.druid.sql.calcite.expression.ExpressionConverter

public class ExpressionConverter
extends Object

Method Summary

Modifier and Type	Method and Description
RowExtraction	convert(PlannerContext plannerContext, List<String> rowOrder, org.apache.calcite.rex.RexNode expression) Translate a row-expression to a Druid row extraction.
static ExpressionConverter	create(List<ExpressionConversion> conversions)

Methods inherited from class java.lang.Object

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

Method Detail

create

public static ExpressionConverter create(List<ExpressionConversion> conversions)

convert

public RowExtraction convert(PlannerContext plannerContext,
                             List<String> rowOrder,
                             org.apache.calcite.rex.RexNode expression)

Translate a row-expression to a Druid row extraction. Note that this signature will probably need to change once we support extractions from multiple columns.

Parameters:

plannerContext - SQL planner context

rowOrder - order of fields in the Druid rows to be extracted from

expression - expression meant to be applied on top of the table

Returns:

(columnName, extractionFn) or null