Answer / Hari Keshwar Prasad

"count_star" in Apache Pig is a UDF (User Defined Function) used to calculate the number of non-null values or star-level cardinality of a schema. It's particularly useful for counting the number of rows or tuples in a relation when the schema isn't known beforehand.nnExample usage:n`DEFINE count_star UDF(); data = FOREACH input_data GENERATE count_star();`

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