Zoltan Haindrich created HIVE-17555:
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Summary: StatsUtils considers all ranges to be 'long'; and loose
precision / introduce bugs in some cases
Key: HIVE-17555
URL: https://issues.apache.org/jira/browse/HIVE-17555
Project: Hive
Issue Type: Bug
Reporter: Zoltan Haindrich
The following test fails because the combined range is: {{\[0:0\]}}
This problem is present in other methods of StatsUtil as well
{code}
package org.apache.hadoop.hive.ql.stats;
import static org.junit.Assert.assertTrue;
import org.apache.hadoop.hive.ql.plan.ColStatistics.Range;
import org.junit.Test;
public class TestStatsUtils {
@Test
public void test1() {
Range r1 = new Range(0.1f, 0.4f);
Range r2 = new Range(0.3f, 0.9f);
assertTrue(rangeContains(r1, 0.2f));
Range r3 = StatsUtils.combineRange(r1, r2);
System.out.println(r3);
assertTrue(rangeContains(r3, 0.2f));
}
private boolean rangeContains(Range range, Number f) {
double m = range.minValue.doubleValue();
double M = range.maxValue.doubleValue();
double v = f.doubleValue();
return m <= v && v <= M;
}
}
{code}
https://github.com/apache/hive/blob/32e854ef1c25f21d53f7932723cfc76bf75a71cd/ql/src/java/org/apache/hadoop/hive/ql/stats/StatsUtils.java#L1955
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