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_r202422357
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/stat/ParquetIsPredicate.java
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@@ -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()
+ exprStat.hasNonNullValue() && ((BooleanStatistics) exprStat).getMin() ||
isAllNulls(exprStat, evaluator.getRowCount()) ? RowsMatch.NONE :
checkNull(exprStat)
Review comment:
@jbimbert
- If all rows are null, what are the values for min and max, should not
`hasNonNullValue` be false?
- Please point me to the specific test that validates that condition.
- I would prefer to see a unit test, not an integration test. For this
particular case, the integration test validates results of a query, but it does
not validate what is the result of
`((ParquetFilterPredicate<Boolean>)createIsFalsePredicate(expr)).canDrop(evaluator)`
is.
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