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pragma warning("disable", "4520");
$my_table =
SELECT 1 AS id, 1 AS ts, 4 AS value1
UNION ALL
SELECT 2 AS id, 1 AS ts, NULL AS value1
UNION ALL
SELECT 1 AS id, 2 AS ts, 4 AS value1
UNION ALL
SELECT 3 AS id, 2 AS ts, 40 AS value1
UNION ALL
SELECT 3 AS id, 5 AS ts, 2 AS value1
UNION ALL
SELECT 3 AS id, 10 AS ts, 40 AS value1
;
$cnt_create = ($_item, $_parent) -> { return 1ul };
$cnt_add = ($state, $_item, $_parent) -> { return 1ul + $state };
$cnt_merge = ($state1, $state2) -> { return $state1 + $state2 };
$cnt_get_result = ($state) -> { return $state };
$cnt_serialize = ($state) -> { return $state };
$cnt_deserialize = ($state) -> { return $state };
-- non-trivial default value
$cnt_default = 0.0;
$cnt_udaf_factory = AggregationFactory(
"UDAF",
$cnt_create,
$cnt_add,
$cnt_merge,
$cnt_get_result,
$cnt_serialize,
$cnt_deserialize,
$cnt_default
);
SELECT
id
, ts
, value1
, AGGREGATE_BY(value1, $cnt_udaf_factory) OVER lagging AS lagging_opt
, AGGREGATE_BY(value1, $cnt_udaf_factory) OVER generic AS generic_opt
, AGGREGATE_BY(ts, $cnt_udaf_factory) OVER lagging AS lagging
, AGGREGATE_BY(ts, $cnt_udaf_factory) OVER generic AS generic
, AGGREGATE_BY(value1, $cnt_udaf_factory) OVER empty AS empty_opt
, AGGREGATE_BY(ts, $cnt_udaf_factory) OVER empty AS empty
FROM $my_table
WINDOW lagging AS (
ORDER BY ts, id
ROWS BETWEEN UNBOUNDED PRECEDING AND 1 PRECEDING
)
, generic AS (
ORDER BY ts, id
ROWS BETWEEN 10 PRECEDING AND 1 PRECEDING
)
, empty AS (
ORDER BY ts, id
ROWS BETWEEN 10 FOLLOWING AND 1 FOLLOWING
)
ORDER BY ts, id;
|
