197f9018a4
## What changes were proposed in this pull request? 1. add instructions of 'cast' function When using 'show functions' and 'desc function cast' command in spark-sql 2. Modify the instructions of functions,such as boolean,tinyint,smallint,int,bigint,float,double,decimal,date,timestamp,binary,string ## How was this patch tested? Before modification: 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`. After modification: spark-sql> desc function boolean; Function: boolean Class: org.apache.spark.sql.catalyst.expressions.Cast Usage: boolean(expr) - Casts the value `expr` to the target data type `boolean`. spark-sql> desc function cast Function: cast Class: org.apache.spark.sql.catalyst.expressions.Cast Usage: cast(expr AS type) - Casts the value `expr` to the target data type `type`. Author: liuxian <liu.xian3@zte.com.cn> Closes #17698 from 10110346/wip_lx_0418. |
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