io.druid.sql.calcite.expression

Class SubstringExpressionConversion

java.lang.Object

io.druid.sql.calcite.expression.AbstractExpressionConversion

io.druid.sql.calcite.expression.SubstringExpressionConversion

All Implemented Interfaces:

ExpressionConversion

public class SubstringExpressionConversion
extends AbstractExpressionConversion

Method Summary

Modifier and Type	Method and Description
RowExtraction	convert(ExpressionConverter converter, PlannerContext plannerContext, List<String> rowOrder, org.apache.calcite.rex.RexNode expression) Translate a row-expression to a Druid column reference.
static SubstringExpressionConversion	instance()

Methods inherited from class io.druid.sql.calcite.expression.AbstractExpressionConversion

operatorName, sqlKind

Methods inherited from class java.lang.Object

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

Method Detail

instance

public static SubstringExpressionConversion instance()

convert

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

Description copied from interface: ExpressionConversion

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

Parameters:

converter - converter that can be used to convert sub-expressions

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