Github user jinfengni commented on a diff in the pull request: https://github.com/apache/drill/pull/805#discussion_r111504302 --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/Metadata.java --- @@ -1668,9 +1666,25 @@ public ColumnMetadata_v3(String[] name, PrimitiveTypeName primitiveType, Object return nulls; } + /** + * Checks that the column chunk has single value. + * Returns true if minValue and maxValue are the same, but not null, + * and all column chunk values are not null. + * Returns true if minValue and maxValue are null and null values count in + * the column chunk is greater than 0. + * + * @return true if column has single value + */ @Override public boolean hasSingleValue() { - return (minValue !=null && maxValue != null && minValue.equals(maxValue)); + if (nulls != null) { --- End diff -- Should this applies to v2 and v1 of ColumnMetadata?
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