spark-sql> describe function `<>`;
Function: <>
Usage: a <> b - Returns TRUE if a is not equal to b
Spark SQL CLI — spark-sql
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 Caution 
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FIXME | 
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 Tip 
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Read about Spark SQL CLI in Spark’s official documentation in Running the Spark SQL CLI. | 
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Functions are registered in FunctionRegistry. | 
spark-sql> show functions;
spark-sql> explain extended show tables;