Package org.apache.druid.sql.calcite.external

Class DruidExternTableMacroConversion

java.lang.Object

org.apache.druid.sql.calcite.external.DruidExternTableMacroConversion

All Implemented Interfaces:

SqlOperatorConversion

Direct Known Subclasses:

ExternalOperatorConversion

public class DruidExternTableMacroConversion
extends Object
implements SqlOperatorConversion

Operator conversion for the `EXTERN` table macros (functions) based on the TableFunction abstraction defined by the catalog.

Constructor Summary

Constructors

Constructor	Description
DruidExternTableMacroConversion(String name, TableFunction fn, com.fasterxml.jackson.databind.ObjectMapper jsonMapper)

Method Summary

Modifier and Type	Method	Description
org.apache.calcite.sql.SqlOperator	calciteOperator()	Returns the SQL operator corresponding to this function.
DruidExpression	toDruidExpression(PlannerContext plannerContext, RowSignature rowSignature, org.apache.calcite.rex.RexNode rexNode)	Translate a Calcite RexNode to a Druid expression.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.sql.calcite.expression.SqlOperatorConversion

toDruidExpressionWithPostAggOperands, toDruidFilter, toPostAggregator

Constructor Details

DruidExternTableMacroConversion

public DruidExternTableMacroConversion(String name,
 TableFunction fn,
 com.fasterxml.jackson.databind.ObjectMapper jsonMapper)

Method Details

calciteOperator

public org.apache.calcite.sql.SqlOperator calciteOperator()

Description copied from interface: SqlOperatorConversion

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

Specified by:

calciteOperator in interface SqlOperatorConversion

Returns:

operator

toDruidExpression

@Nullable
public DruidExpression toDruidExpression(PlannerContext plannerContext,
 RowSignature rowSignature,
 org.apache.calcite.rex.RexNode rexNode)

Description copied from interface: SqlOperatorConversion

Translate a Calcite RexNode to a Druid expression.

Specified by:

toDruidExpression in interface SqlOperatorConversion

Parameters:

plannerContext - SQL planner context

rowSignature - signature of the rows to be extracted from

rexNode - expression meant to be applied on top of the rows

Returns:

Druid expression, or null if translation is not possible

See Also:

• Expressions.toDruidExpression(PlannerContext, RowSignature, RexNode)