Commit Graph

25 Commits

Author SHA1 Message Date
Alexey Milovidov
8ff93487e3 Miscellaneous [#CLICKHOUSE-2]. 2017-12-25 07:01:46 +03:00
Alexey Milovidov
14b0397500 Better semantic of sharing columns: development [#CLICKHOUSE-2]. 2017-12-16 08:21:04 +03:00
Alexey Milovidov
7284a64740 Better semantic of sharing columns: development [#CLICKHOUSE-2]. 2017-12-16 00:32:25 +03:00
Alexey Milovidov
f3bb24a3bf Better semantic of sharing columns: development [#CLICKHOUSE-2]. 2017-12-14 04:43:19 +03:00
Alexey Milovidov
3def5f03f5 Cleanup semantics of data types [#CLICKHOUSE-2]. 2017-12-09 19:17:37 +03:00
Alexey Milovidov
d2cfda4d9b Cleanup semantics of data types [#CLICKHOUSE-2]. 2017-12-09 19:17:37 +03:00
Alexey Milovidov
c748493a86 Better [#CLICKHOUSE-2]. 2017-12-02 05:47:12 +03:00
proller
ed848a7186 Fix warning on arm 2017-09-24 16:59:18 +03:00
Alexey Milovidov
565902fc4d Added comment; fixed test [#CLICKHOUSE-2]. 2017-09-17 20:58:30 +03:00
Alexey Milovidov
b80788a2f4 Better implementation of "roundToExp2" function [#CLICKHOUSE-2]. 2017-09-17 01:12:24 +03:00
Alexey Milovidov
c2595934f1 FunctionsRound: continue [#CLICKHOUSE-2]. 2017-09-16 23:17:19 +03:00
Alexey Milovidov
d48725f9a7 FunctionsRound: continue [#CLICKHOUSE-2]. 2017-09-16 22:33:49 +03:00
Alexey Milovidov
84d61b501c FunctionsRound: continue [#CLICKHOUSE-2]. 2017-09-16 22:31:20 +03:00
Alexey Milovidov
ad13a8c79d Fixed half of bad code [#CLICKHOUSE-2]. 2017-09-16 21:36:16 +03:00
Alexey Milovidov
0002507598 Added function "trunc"; simplifications [#CLICKHOUSE-2]. 2017-09-16 19:47:05 +03:00
Alexey Milovidov
25f2f032d1 Added function "trunc"; simplifications [#CLICKHOUSE-2]. 2017-09-16 19:38:27 +03:00
Alexey Milovidov
86c46ad1bd Unification [#CLICKHOUSE-2]. 2017-09-15 15:16:12 +03:00
Alexey Milovidov
306070d2cc Fixed error in one of prev. revisions [#CLICKHOUSE-3150]. 2017-07-30 22:47:32 +03:00
Alexey Milovidov
ee81d53bd5 Functions simplification [#CLICKHOUSE-2]. 2017-07-25 01:44:13 +03:00
alexey-milovidov
d4d266fa18 ColumnConst unification (#1011)
* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* Fixed error in ColumnArray::replicateGeneric [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].

* ColumnConst: unification (incomplete) [#CLICKHOUSE-3150].
2017-07-21 09:35:58 +03:00
Marek Vavruša
ff73394124 PKCondition: infer index use with pk subexpression
By default only constraints explicitly matching
primary key expression (or expression wrapped in
a monotonic function) are eligible for part and
range selection. So for example, if index is:

(toStartOfHour(dt), UserID)

Then a query such as this resorts to full scan:

SELECT count() FROM t WHERE dt = now()

Intuitively, only parts with toStartOfHour(now())
could be selected, but it is less trivial to prove.
The primary key currently can be wrapped in a chain
of monotonic functions, so following would work:

toStartOfHour(dt) = toStartOfHour(now()) AND dt = now()

It must be however explicitly stated, if we wanted
to infer that we’d have to know the inverse function,
and prove that the inverse function is monotonic
on given interval. This is not practical as
there is no inverse function that for example undos
rounding, it isn’t strictly monotonic.

There are however functions that don’t transform
output range and preserve monotonicity on the
complete input range, such as rounding or casts
to a same or wider numeric type. This eliminates
the need to find inverse function, as no check for monotonicity over arbitrary interval is needed,
and thus makes this optimisation possible.
2017-07-09 17:13:51 +03:00
Alexey Milovidov
782fe332b1 Miscellaneous [#CLICKHOUSE-31]. 2017-06-13 07:13:54 +03:00
f1yegor
0882092c20 translate comments: functions 2017-05-27 17:45:25 +02:00
orantius
da83036326 Add age 55 for function roundAge. [#CLICKHOUSE-3001] 2017-05-15 22:42:39 +04:00
Alexey Milovidov
310736cd7e Moved headers and sources to same place [#CLICKHOUSE-3]. 2017-04-01 12:22:42 +03:00