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withWatermark ( eventTime, delayThreshold ) ¶ĭefines an event time watermark for this DataFrame. For any other return type, the produced object must match the specified type. When the return type is not given it default to a string and conversion will automaticallyīe done. In addition to a name and the function itself, the return type can be optionally specified. Registers a python function (including lambda function) as a UDF register ( name, f, returnType=StringType ) ¶ Wrapper for user-defined function registration. When those change outside of Spark SQL, users shouldĬall this function to invalidate the cache. Library it uses might cache certain metadata about a table, such as the ![]() For performance reasons, Spark SQL or the external data source Invalidate and refresh all the cached the metadata of the given We can also use int as a short name for .ĭeprecated in 2.0.0.
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