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https://issues.apache.org/jira/browse/KUDU-1363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15241628#comment-15241628
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Sameer Abhyankar commented on KUDU-1363:
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Thanks Dan! The overview is very helpful! I haven't gotten to reviewing the
code yet to understand why scanning for an IN list predicate will be
inefficient. However, my plan is to do that tomorrow.
Given that, does it make sense for me to start working on adding an IN
predicate and the associated processing components?
> 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
>
> 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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