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https://issues.apache.org/jira/browse/KUDU-1363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15274696#comment-15274696
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Sameer Abhyankar commented on KUDU-1363:
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Hi [~danburkert] I have uploaded an initial cut of the patch for your review.
This is just the C++ client. I still have a little more work to do for
scan_spec, partition_pruner and possibly key_util. However, I can continue to
do that while this is being reviewed. I have added a bunch of test cases for
the new predicates. Once everything looks good with this, I can work on the
Java client (which I think will be much easier now that I am familiar with how
these predicates flow..). I will be happy to make changes based on the review.
Thx!
> Add Multiple column range predicates for the same column in a single scan
> -------------------------------------------------------------------------
>
> Key: KUDU-1363
> URL: https://issues.apache.org/jira/browse/KUDU-1363
> Project: Kudu
> Issue Type: New Feature
> Reporter: Chris George
> Assignee: Sameer Abhyankar
>
> Currently adding multiple column range predicates for the same column does
> essentially an AND between the two predicates which will cause no results to
> be returned.
> This would greatly increase performance were I can complete in one scan what
> would otherwise take two.
> As an example using the java api:
> ColumnRangePredicate columnRangePredicateColumnNameA = new
> ColumnRangePredicate(new ColumnSchema.ColumnSchemaBuilder("column_name",
> Type.STRING).build());
> columnRangePredicateColumnNameA.setLowerBound("A");
> columnRangePredicateColumnNameA.setUpperBound("A");
> ColumnRangePredicate columnRangePredicateColumnNameB = new
> ColumnRangePredicate(new ColumnSchema.ColumnSchemaBuilder("column_name",
> Type.STRING).build());
> columnRangePredicateColumnNameB.setLowerBound("B");
> columnRangePredicateColumnNameB.setUpperBound("B");
> which would be equivalent:
> select * from some_table where column_name="A" or column_name="B"
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