array_compact.sql

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-- ConfigMatrix: parquet.enable.dictionary=false,true

statement
CREATE TABLE test_array_compact(
  ints array<int>,
  strs array<string>,
  dbls array<double>,
  nested array<array<int>>
) USING parquet

statement
INSERT INTO test_array_compact VALUES
  (array(1, NULL, 2, NULL, 3), array('a', NULL, 'b', NULL, 'c'), array(1.0, NULL, 2.0), array(array(1, NULL, 3), NULL, array(4, NULL, 6))),
  (array(), array(), array(), array()),
  (NULL, NULL, NULL, NULL),
  (array(NULL, NULL), array(NULL, NULL), array(NULL, NULL), array(NULL, NULL)),
  (array(1, 2, 3), array('x', 'y', 'z'), array(1.5, 2.5), array(array(1, 2), array(3, 4)))

-- integer column
query
SELECT array_compact(ints) FROM test_array_compact

-- string column
query
SELECT array_compact(strs) FROM test_array_compact

-- double column
query
SELECT array_compact(dbls) FROM test_array_compact

-- nested array column: outer nulls removed, inner nulls preserved
query
SELECT array_compact(nested) FROM test_array_compact

-- literal arguments
query
SELECT array_compact(array(1, NULL, 2, NULL, 3))

-- literal string array
query
SELECT array_compact(array('a', NULL, 'b'))

-- all-null literal array
query
SELECT array_compact(array(NULL, NULL, NULL))