Package org.apache.flink.table.planner.functions.casting

Interface ExpressionCodeGeneratorCastRule<IN,OUT>

Type Parameters:

IN - Input internal type

OUT - Output internal type

All Superinterfaces:

CastRule<IN,OUT>, CodeGeneratorCastRule<IN,OUT>

@Internal
public interface ExpressionCodeGeneratorCastRule<IN,OUT>
extends CodeGeneratorCastRule<IN,OUT>

Cast rule that is able to generate a single expression containing all the casting logic.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.table.planner.functions.casting.CodeGeneratorCastRule

CodeGeneratorCastRule.Context

Method Summary

Modifier and Type	Method	Description
String	generateExpression(CodeGeneratorCastRule.Context context, String inputTerm, LogicalType inputLogicalType, LogicalType targetLogicalType)	Generate a Java expression performing the casting.

Methods inherited from interface org.apache.flink.table.planner.functions.casting.CastRule

canFail, create, getPredicateDefinition

Methods inherited from interface org.apache.flink.table.planner.functions.casting.CodeGeneratorCastRule

generateCodeBlock

Method Detail

generateExpression

String generateExpression(CodeGeneratorCastRule.Context context,
                          String inputTerm,
                          LogicalType inputLogicalType,
                          LogicalType targetLogicalType)

Generate a Java expression performing the casting. This expression can be wrapped in another expression, or assigned to a variable or returned from a function.

NOTE: the inputTerm is always either a primitive or a non-null object, while the expression result is either a primitive or a nullable object.