emkornfield commented on code in PR #17877:
URL: https://github.com/apache/arrow/pull/17877#discussion_r1080690591
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cpp/src/parquet/column_reader_test.cc:
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@@ -757,6 +760,63 @@ TEST_F(RecordReaderTest, BasicReadRepeatedField) {
/*levels_position=*/0);
}
+// Tests reading the nullable values without saving a space for nulls.
+TEST_F(RecordReaderTest, ReadDenseForNullable) {
+ Init(/*max_def_level=*/1, /*max_rep_level=*/1, Repetition::REPEATED,
+ /*read_dense_for_nullable=*/true);
+
+ // Records look like: {[10], null, [20, 20], null, [30, 30, 30], null}
+ std::vector<std::shared_ptr<Page>> pages;
+ std::vector<int32_t> values = {10, 20, 20, 30, 30, 30};
+ std::vector<int16_t> def_levels = {1, 0, 1, 1, 0, 1, 1, 1, 0};
Review Comment:
we should probably add a test for when 3 level encoding lists so we can
check behavior for a list containing a null element and an empty list?
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