yordan-pavlov commented on issue #1111:
URL: https://github.com/apache/arrow-rs/issues/1111#issuecomment-1003446768
I have been able to reproduce the issue where `RleDecoder` returns more keys
than values (as explained by @tustvold above) by adding a test very similar to
the existing `test_arrow_array_reader_string` but using dictionary encoding
instead of plain. Next, I will looking for a short-term fix.
Here is some sample output from the test:
running 1 test
page num_values: 100, values.len(): 33
page num_values: 100, values.len(): 38
VariableLenPlainDecoder::new, num_values: 9
---------- reading a batch of 50 values ----------
VariableLenDictionaryDecoder::new, num_values: 100
VariableLenDictionaryDecoder::read_value_bytes - begin, self.num_values:
100, num_values: 14
VariableLenDictionaryDecoder::read_value_bytes - end, values_read: 14,
self.num_values: 86
**// ok so far, 33 actual values - 14 values read = 19 values still left in
first page**
---------- reading a batch of 100 values ----------
VariableLenPlainDecoder::new, num_values: 10
VariableLenDictionaryDecoder::new, num_values: 100
VariableLenDictionaryDecoder::read_value_bytes - begin, self.num_values: 86,
num_values: 37
VariableLenDictionaryDecoder::read_value_bytes - end, values_read: 26,
self.num_values: 0
**// this is a problem - only 19 values were left in the first page, but 26
values have been read**
VariableLenDictionaryDecoder::read_value_bytes - begin, self.num_values: 0,
num_values: 11
VariableLenDictionaryDecoder::read_value_bytes - end, values_read: 0,
self.num_values: 0
VariableLenDictionaryDecoder::read_value_bytes - begin, self.num_values:
100, num_values: 11
VariableLenDictionaryDecoder::read_value_bytes - end, values_read: 11,
self.num_values: 89
thread
'arrow::arrow_array_reader::tests::test_arrow_array_reader_dict_string'
panicked at 'assertion failed: `(left == right)`
left: `"H"`,
right: `"He"`', parquet\src\arrow\arrow_array_reader.rs:1745:17
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