Package org.apache.flink.table.planner.expressions.converter
package org.apache.flink.table.planner.expressions.converter
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ClassDescriptionRule to convert
CallExpression.Context ofCallExpressionConvertRule.CustomizedCallExpressionConvertRule, 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.ACallExpressionConvertRulethat performs a simple one-to-one mapping betweenFunctionDefinitionand a correspondingSqlOperator.Visit expression to generatorRexNode.A call expression converter rule that converts calls to user defined functions.CallExpressionConvertRuleto convertScalarFunctionDefinition.ACallExpressionConvertRulethat convertsBuiltInFunctionDefinitions.OVER.