liuxian created SPARK-20403:
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             Summary: It is wrong to the instructions of some functions,such as 
 
boolean,tinyint,smallint,int,bigint,float,double,decimal,date,timestamp,binary,string
                 Key: SPARK-20403
                 URL: https://issues.apache.org/jira/browse/SPARK-20403
             Project: Spark
          Issue Type: Bug
          Components: Documentation, SQL
    Affects Versions: 2.1.0
            Reporter: liuxian
            Priority: Trivial


spark-sql>desc function boolean;
Function: boolean
Class: org.apache.spark.sql.catalyst.expressions.Cast
Usage: boolean(expr AS type) - Casts the value `expr` to the target data type 
`type`.

spark-sql>desc function int;
Function: int
Class: org.apache.spark.sql.catalyst.expressions.Cast
Usage: int(expr AS type) - Casts the value `expr` to the target data type 
`type`.



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