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https://issues.apache.org/jira/browse/DRILL-5796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16513972#comment-16513972
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ASF GitHub Bot commented on DRILL-5796:
---------------------------------------
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_r195776815
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/stat/ParquetFilterPredicate.java
##########
@@ -18,5 +18,17 @@
package org.apache.drill.exec.expr.stat;
public interface ParquetFilterPredicate<T extends Comparable<T>> {
- boolean canDrop(RangeExprEvaluator<T> evaluator);
+
+ /**
+ * Define the validity of a row group against a filter
+ * <ul>
+ * <li>ALL : all rows match the filter (can not drop the row group and
prune filter)
+ * <li>NONE : no row matches the filter (can drop the row group)
+ * <li>SOME : some rows only match the filter (can not drop the row group
not the filter)
+ * <li>INAPPLICABLE : filter can not be applied
Review comment:
Suppose I have set/group of rows and a filter. Applying the filter to the
set of rows may result in an empty set (`NONE`), partial set (`SOME`) and the
same set as original one (`ALL`). What does `INAPPLICABLE` mean? Does it mean
the result is unknown? But does it really matter whether it is partial or
unknown?
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> Filter pruning for multi rowgroup parquet file
> ----------------------------------------------
>
> Key: DRILL-5796
> URL: https://issues.apache.org/jira/browse/DRILL-5796
> Project: Apache Drill
> Issue Type: Improvement
> Components: Storage - Parquet
> Reporter: Damien Profeta
> Assignee: Jean-Blas IMBERT
> Priority: Major
> Fix For: 1.14.0
>
>
> Today, filter pruning use the file name as the partitioning key. This means
> you can remove a partition only if the whole file is for the same partition.
> With parquet, you can prune the filter if the rowgroup make a partition of
> your dataset as the unit of work if the rowgroup not the file.
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