org.apache.flink.table.functions
所有的内置函数
org.apache.flink.table.functions.BuiltInFunctionDefinitions
以Date_Format为例
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public static final BuiltInFunctionDefinition DATE_FORMAT = new BuiltInFunctionDefinition.Builder() .name("dateFormat") .kind(SCALAR) .outputTypeStrategy(TypeStrategies.MISSING) .build();
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