array_join.sql

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statement
CREATE TABLE test_array_join(arr array<string>) USING parquet

statement
INSERT INTO test_array_join VALUES (array('a', 'b', 'c')), (array('hello', 'world')), (array()), (NULL), (array('a', NULL, 'c'))

query spark_answer_only
SELECT array_join(arr, ',') FROM test_array_join

query spark_answer_only
SELECT array_join(arr, ',', 'NULL') FROM test_array_join