PARQUET-1246: Ignore float/double statistics in case of NaN - #461
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gszadovszky wants to merge 2 commits into
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PARQUET-1246: Ignore float/double statistics in case of NaN#461gszadovszky wants to merge 2 commits into
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zivanfi
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Mar 14, 2018
| Float max = stats.genericGetMax(); | ||
| // Drop min/max values in case of NaN as the sorting order of values is undefined for this case | ||
| if (min.isNaN() || max.isNaN()) { | ||
| stats.setMinMax(0.0f, 0.0f); |
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This seems unnecessary. On the other hand, this is the default value when it's unset, so I'm fine with leaving this.
| ((Statistics<?>) stats).hasNonNullValue = false; | ||
| } else { | ||
| // Updating min to -0.0 and max to +0.0 to ensure that no 0.0 values would be skipped | ||
| if (min == 0.0f) { |
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+0 and -0 are equal according to ==. Please use Float.compareTo() instead.
| // Updating min to -0.0 and max to +0.0 to ensure that no 0.0 values would be skipped | ||
| if (min == 0.0f) { | ||
| stats.setMinMax(-0.0f, max); | ||
| min = -0.0f; |
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(nit) In my opinion,
min = -0.0f;
stats.setMinMax(min, max);
would be cleaner. Similar for the max case (although max is not used any more in this function).
| } | ||
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| @Override | ||
| public Statistics<?> build() { |
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Same comments as for the float case.
| assertEquals(max, stats.genericGetMax()); | ||
| } | ||
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| @Test |
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Please add test case for -0 and +0.
zivanfi
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Mar 14, 2018
zivanfi
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LGTM, thanks. I'll merge this on Monday if nobody else requests any more changes.
legend-hua
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Mar 23, 2018
Because of the ambigous sorting order of float/double the following changes made at the reading path of the related statistics: - Ignoring statistics in case of it contains a NaN value. - Using -0.0 as min value and +0.0 as max value independently from which 0.0 value was saved in the statistics. Author: Gabor Szadovszky <gabor.szadovszky@cloudera.com> Closes apache#461 from gszadovszky/PARQUET-1246 and squashes the following commits: 20e9332 [Gabor Szadovszky] PARQUET-1246: Changes according to zi's comments 3447938 [Gabor Szadovszky] PARQUET-1246: Ignore float/double statistics in case of NaN
gszadovszky
pushed a commit
to gszadovszky/parquet-mr
that referenced
this pull request
Apr 24, 2018
Because of the ambigous sorting order of float/double the following changes made at the reading path of the related statistics: - Ignoring statistics in case of it contains a NaN value. - Using -0.0 as min value and +0.0 as max value independently from which 0.0 value was saved in the statistics. Author: Gabor Szadovszky <gabor.szadovszky@cloudera.com> Closes apache#461 from gszadovszky/PARQUET-1246 and squashes the following commits: 20e9332 [Gabor Szadovszky] PARQUET-1246: Changes according to zi's comments 3447938 [Gabor Szadovszky] PARQUET-1246: Ignore float/double statistics in case of NaN This change is based on 0a86429 but is not a clean cherry-pick.
zivanfi
pushed a commit
that referenced
this pull request
Apr 25, 2018
Because of the ambigous sorting order of float/double the following changes made at the reading path of the related statistics: - Ignoring statistics in case of it contains a NaN value. - Using -0.0 as min value and +0.0 as max value independently from which 0.0 value was saved in the statistics. Author: Gabor Szadovszky <gabor.szadovszky@cloudera.com> Closes #461 from gszadovszky/PARQUET-1246 and squashes the following commits: 20e9332 [Gabor Szadovszky] PARQUET-1246: Changes according to zi's comments 3447938 [Gabor Szadovszky] PARQUET-1246: Ignore float/double statistics in case of NaN This change is based on 0a86429 but is not a clean cherry-pick.
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Because of the ambigous sorting order of float/double the following changes made at the reading path of the related statistics: