Question
How Apache Pig deals with the schema and schema-less data?
Answers
The Apache Pig handles both, schema as well as schema-less data.

If the schema only includes the field name, the data type of field is considered as a byte array.
If you assign a name to the field you can access the field by both, the field name and the positional notation, whereas if field name is missing we can only access it by the positional notation i.e. $ followed by the index number.
If you perform any operation which is a combination of relations (like JOIN, COGROUP, etc.) and if any of the relation is missing schema, the resulting relation will have null schema.
If the schema is null, Pig will consider it as a byte array and the real data type of field will be determined dynamically.   Your Comment




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