Aggregate ranges by merging
-
07-10-2020 - |
Question
There aren't any Aggregate functions for Range types in PostgreSQL.
How to aggregate ranges using a merge operation?
This solution works but does not look optimal:
CREATE TEMPORARY TABLE test_ranges (r int4range);
INSERT INTO test_ranges VALUES ('[4, 8)'), ('[12, 45)'), (NULL);
SELECT int4range(min(lower(r)), max(upper(r))) FROM test_ranges;
=> '[4,45)'
Solution
Create an aggregate using the range_merge(anyrange, anyrange)
function.
CREATE AGGREGATE range_merge(anyrange)
(
sfunc = range_merge,
stype = anyrange
);
SELECT range_merge(r) FROM test_ranges;
=> '[4,45)'
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