Fucun Chu created IMPALA-10520:
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Summary: Implement ds_theta_intersect() builtin function
Key: IMPALA-10520
URL: https://issues.apache.org/jira/browse/IMPALA-10520
Project: IMPALA
Issue Type: New Feature
Components: Backend, Frontend
Reporter: Fucun Chu
Fix For: Impala 4.0
ds_theta_intersect() is an aggregate function that accepts a sketch and
produces a single sketch, which is the intersection of the received sketches.
Example from Hive:
{code:java}
create temporary table sketch_intermediate (category char(1), sketch binary);
insert into sketch_intermediate select category, ds_theta_sketch(id) from
sketch_input group by category;
select ds_theta_estimate(ds_theta_intersect(sketch)) from
sketch_intermediate;{code}
Some test data for the example:
{code:java}
create temporary table sketch_input (id int, category char(1));
insert into table sketch_input values
(1, 'a'), (2, 'a'), (3, 'a'), (4, 'a'), (5, 'a'), (6, 'a'), (7, 'a'), (8,
'a'), (9, 'a'), (10, 'a'),
(6, 'b'), (7, 'b'), (8, 'b'), (9, 'b'), (10, 'b'), (11, 'b'), (12, 'b'), (13,
'b'), (14, 'b'), (15, 'b');{code}
Approximate result:
{code:java}
5.0{code}
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