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Support skip_rep_levels in ColumnLevelDecoder #2108

@Ted-Jiang

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@Ted-Jiang

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

pub trait RepetitionLevelDecoder: ColumnLevelDecoder {
/// Skips over repetition level corresponding to `num_records` records, where a record
/// is delimited by a repetition level of 0
///
/// Returns the number of records skipped, and the number of levels skipped
fn skip_rep_levels(&mut self, num_records: usize) -> Result<(usize, usize)>;
}

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