io.druid.sql.calcite.expression

Interface SqlExtractionOperator

All Known Implementing Classes:

CharacterLengthExtractionOperator, ExtractExtractionOperator, FloorExtractionOperator, LookupExtractionOperator, RegexpExtractExtractionOperator, SubstringExtractionOperator

public interface SqlExtractionOperator

Method Summary

Modifier and Type	Method and Description
org.apache.calcite.sql.SqlFunction	calciteFunction() Returns the SQL operator corresponding to this aggregation function.
RowExtraction	convert(PlannerContext plannerContext, List<String> rowOrder, org.apache.calcite.rex.RexNode expression) Returns the Druid RowExtraction corresponding to a SQL RexNode.

Method Detail

calciteFunction

org.apache.calcite.sql.SqlFunction calciteFunction()

Returns the SQL operator corresponding to this aggregation function. Should be a singleton.

Returns:

operator

convert

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

Returns the Druid RowExtraction corresponding to a SQL RexNode.

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

See Also:

Expressions.toRowExtraction(PlannerContext, List, RexNode)