npawar commented on a change in pull request #6021:
URL: https://github.com/apache/incubator-pinot/pull/6021#discussion_r489182763
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File path:
pinot-core/src/main/java/org/apache/pinot/core/segment/processing/framework/SegmentMapper.java
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@@ -100,8 +110,11 @@ public void map()
}
// Partitioning
- // TODO: 2 step partitioner. 1) Apply custom partitioner 2) Apply table
config partitioner. Combine both to get final partition.
- String partition = _partitioner.getPartition(reusableRow);
+ int p = 0;
+ for (Partitioner partitioner : _partitioners) {
+ partitions[p++] = partitioner.getPartition(reusableRow);
+ }
+ String partition = StringUtil.join("_", partitions);
Review comment:
Use case: say data in input segments is spread across 3 days. In the
resulting segments, we want to create a segment for each day. Additionally, we
want partitioning on some id column for query purposes.
Partitioning by time column is first step. This doesn't affect segment
metadata or broker routing. This is simply used by the framework, and it's
scope ends with the framework. It's merely helping create date aligned input
files for Segment generation stage.
Partitioning by id column is second step. This is for queries. This will be
whatever is in the table config. Only this partition will get set in the
segment metadata. And even that will happen during segment creation.
See this comment and
discussion:https://github.com/apache/incubator-pinot/pull/5934#discussion_r486006754
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