org.apache.calcite.adapter.druid

Interface DruidSqlOperatorConverter

All Known Implementing Classes:

BinaryOperatorConversion, CeilOperatorConversion, DirectOperatorConversion, DruidSqlCastConverter, ExtractOperatorConversion, FloorOperatorConversion, NaryOperatorConverter, SubstringOperatorConversion, UnaryPrefixOperatorConversion, UnarySuffixOperatorConversion

public interface DruidSqlOperatorConverter

Defines how to convert RexNode with a given calcite SQL operator to Druid expressions

Method Summary

Modifier and Type	Method and Description
SqlOperator	calciteOperator() Returns the calcite SQL operator corresponding to Druid operator.
String	toDruidExpression(RexNode rexNode, RelDataType rowType, DruidQuery druidQuery) Translate rexNode to valid Druid expression.

Method Detail

calciteOperator

SqlOperator calciteOperator()

Returns the calcite SQL operator corresponding to Druid operator.

Returns:

operator

toDruidExpression

@Nullable
String toDruidExpression(RexNode rexNode,
                                   RelDataType rowType,
                                   DruidQuery druidQuery)

Translate rexNode to valid Druid expression.

Parameters:

rexNode - rexNode to translate to Druid expression

rowType - row type associated with rexNode

druidQuery - druid query used to figure out configs/fields related like timeZone

Returns:

valid Druid expression or null if it can not convert the rexNode