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GH-3574: Preserve null counts when min/max exceed limit - #3819
efegokdemir wants to merge 2 commits into
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Signed-off-by: Efe Gökdemir <efe@rexcode.co.uk>
divjotarora
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divjotarora
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Thanks @efegokdemir!
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@efegokdemir My previous comment was not addressed, the current code still sets NaN count stats after the withinLimit check. I suggest we set null + NaN stats unconditionally and guard only min/max by the withinLimit check.
Proposed code:
formatStats.setNull_count(stats.getNumNulls());
if (stats.isNanCountSet()) {
formatStats.setNan_count(stats.getNanCount());
}
if (!withinLimit(stats, truncateLength)) {
return formatStats;
}
Signed-off-by: Efe Gökdemir <gokdemirefe1903@gmail.com>
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Moved |
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Thanks for flagging #3688. At the current head, this change emits |
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@divjotarora Sorry I cannot find any concrete evidence right now. If I remember it correctly, that change may break Iceberg to consume Parquet statistics. Perhaps @kevinjqliu @Fokko could provide more detail. |
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Summary
Preserve
null_countwhen a column's min/max statistics exceed the metadata size limit.The size guard is needed for min/max values, but
null_countis a compact independent statistic and remains useful to readers. This keeps the null count available without reintroducing oversized min/max metadata.Changes
null_countandnan_countbefore applying the min/max size limit for non-empty statistics.Testing
git diff --checkpassed.Compatibility note
For oversized, non-empty statistics, this changes the result from no statistics to counts without min/max. This is narrower than the unconditional null-count change reverted in #3688, but it still changes the previous all-or-nothing behavior. That compatibility question is under discussion.
Fixes #3574