vrozov commented on a change in pull request #1298: DRILL-5796: Filter pruning
for multi rowgroup parquet file
URL: https://github.com/apache/drill/pull/1298#discussion_r204099135
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/stat/ParquetIsPredicate.java
##########
@@ -124,8 +124,7 @@ private static LogicalExpression
createIsTruePredicate(LogicalExpression expr) {
*/
private static LogicalExpression createIsFalsePredicate(LogicalExpression
expr) {
return new ParquetIsPredicate<Boolean>(expr, (exprStat, evaluator) ->
- //if min value is not false or if there are all nulls -> canDrop
- isAllNulls(exprStat, evaluator.getRowCount()) ||
exprStat.hasNonNullValue() && ((BooleanStatistics) exprStat).getMin()
+ isAllNulls(exprStat, evaluator.getRowCount()) ||
exprStat.hasNonNullValue() && ((BooleanStatistics) exprStat).getMin() ?
RowsMatch.NONE : checkNull(exprStat)
Review comment:
I don't understand how it works for the use cases you provided, but I would
expect the following unit test to pass while it actually fails:
```
public void testSOME() {
LogicalExpression le = mock(LogicalExpression.class);
BooleanStatistics booleanStatistics = mock(BooleanStatistics.class);
doReturn(booleanStatistics).when(le).accept(ArgumentMatchers.any(),
ArgumentMatchers.any());
RangeExprEvaluator<Boolean> re = mock(RangeExprEvaluator.class);
when(re.getRowCount()).thenReturn(Long.valueOf(2)); // 2 rows
when(booleanStatistics.isEmpty()).thenReturn(FALSE); // stat is not empty
when(booleanStatistics.isNumNullsSet()).thenReturn(TRUE); // num_nulls
set
when(booleanStatistics.getNumNulls()).thenReturn(Long.valueOf(0)); // no
nulls
when(booleanStatistics.hasNonNullValue()).thenReturn(TRUE); // min/max
set
when(booleanStatistics.getMin()).thenReturn(Boolean.FALSE); // min false
when(booleanStatistics.getMax()).thenReturn(TRUE); // max true
assertEquals(SOME, ((ParquetIsPredicate<Boolean>)
createIsPredicate(IS_TRUE, le)).matches(re));
assertEquals(SOME, ((ParquetIsPredicate<Boolean>)
createIsPredicate(IS_FALSE, le)).matches(re));
}
```
```
java.lang.AssertionError:
Expected :SOME
Actual :ALL
```
I would prefer to see similar unit tests and not the integration tests that
you point me to and that may succeed for a different reason (I'd like to see an
explanation why they succeed as well).
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