foreword
In the process of building the data warehouse, data migration needs to be carried out from the business side! Most companies use data warehouses Hive, while the business side mostly uses Oracledatabases. Recently, a small partner encountered a problem during the migration:
Judging from the error report, Decode()there is a problem with passing parameters when using the function!
Now that the problem has come, let's solve it. Only by constantly solving the problem can the value be reflected!
Decode function in Hive
First look at how the Hivemiddle Decodefunction is defined
desc function extended decode;
Execute the above statement to view Decodethe function definition SQL, the result is as follows:
decode(bin, str)