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Asked by: Neyva Zhiryakov
technology and computing databasesWhat is the default data type of fields in pig?
float : It is a 32 bit floating point. This data type is similar to the Float in java. It is the default data type. If you don't specify a data type for a filed, then bytearray datatype is assigned for the field.
Then, what are the complex data types in pig?
Complex Types. Pig has three complex data types: maps, tuples, and bags. All of these types can contain data of any type, including other complex types. So it is possible to have a map where the value field is a bag, which contains a tuple where one of the fields is a map.
Just so, what is flatten in pig?
The FLATTEN operator which is an arithmetic operator looks like a UDF syntactically, but it is actually an operator that changes the structure of tuples and bags in a way that a UDF cannot. Flatten un-nests tuples as well as bags. For tuples, flatten substitutes the fields of a tuple in place of the tuple.
Keywords in Pig Latin are not case-sensitive; for example, LOAD is equivalent to load . But relation and field names are, so A = load 'foo'; is not equivalent to a = load 'foo'; . UDF names are also case-sensitive; thus, COUNT is not the same UDF as count .