org.apache.flink.table.planner.expressions.converter

Class CustomizedConvertRule

java.lang.Object

org.apache.flink.table.planner.expressions.converter.CustomizedConvertRule

All Implemented Interfaces:

CallExpressionConvertRule

public class CustomizedConvertRule
extends Object
implements CallExpressionConvertRule

Customized CallExpressionConvertRule, Functions conversion here all require special logic, and there may be some special rules, such as needing get the literal values of inputs, such as converting to combinations of functions, to convert to RexNode of calcite.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.table.planner.expressions.converter.CallExpressionConvertRule

CallExpressionConvertRule.ConvertContext

Constructor Summary

Constructors

Constructor and Description
CustomizedConvertRule()

Method Summary

Modifier and Type	Method and Description
Optional<org.apache.calcite.rex.RexNode>	convert(org.apache.flink.table.expressions.CallExpression call, CallExpressionConvertRule.ConvertContext context) Convert call expression with context to RexNode.

Methods inherited from class java.lang.Object

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

Constructor Detail

CustomizedConvertRule

public CustomizedConvertRule()

Method Detail

convert

public Optional<org.apache.calcite.rex.RexNode> convert(org.apache.flink.table.expressions.CallExpression call,
                                                        CallExpressionConvertRule.ConvertContext context)

Description copied from interface: CallExpressionConvertRule

Convert call expression with context to RexNode.

Specified by:

convert in interface CallExpressionConvertRule

Returns:

Success return RexNode of Optional.of(T), Fail return Optional.empty().