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946 Commits

Author SHA1 Message Date
Denny Crane
95b701a37c
Update table.md 2023-02-24 13:17:30 -04:00
Denny Crane
9974f45ab0
Update table.md 2023-02-24 13:15:35 -04:00
Rich Raposa
25a759d8d1
Update insert-into.md 
Fix the formatting
 2023-02-23 14:41:45 -07:00
robot-ch-test-poll1
300dfbbef6
Merge pull request #46460 from ClickHouse/group-by-use-nulls-docs 
Add documentation for `group_by_use_nulls` setting
 2023-02-16 18:41:34 +01:00
Dmitry Novik
c95df21324 Review fixes 2023-02-16 15:38:25 +00:00
Dmitry Novik
b908fa32df Add documentation for group_by_use_nulls 2023-02-16 00:57:53 +00:00
Denny Crane
6d1b3dcd78
Update prewhere.md 2023-02-14 13:07:01 -04:00
Denny Crane
e07c723032
Update prewhere.md 2023-02-14 13:03:44 -04:00
Antonio Andelic
a58653820e Update docs 2023-02-03 18:19:12 +00:00
DanRoscigno
c9244335ef move title to frontmatter 2023-02-03 09:21:30 -05:00
DanRoscigno
7889b632d6 add metadata 2023-02-03 09:16:33 -05:00
DanRoscigno
26a6c5a25b combine guide and reference for lightweight deletes 2023-02-03 09:13:48 -05:00
Alexander Tokmakov
cce6d1989e
Update system.md 2023-02-02 22:01:00 +03:00
Robert Schulze
b512316586
Merge pull request #45682 from ClickHouse/rename-qrc-to-qc 
Rename "Query Result Cache" to "Query Cache"
 2023-02-01 11:23:29 +01:00
Alexander Gololobov
e705f11ad1
Merge pull request #45786 from ClickHouse/delete_on_cluster 
Support DELETE ON CLUSTER
 2023-02-01 10:52:01 +01:00
robot-ch-test-poll2
202fa9fa37
Merge pull request #45859 from FArthur-cmd/show_engines_support 
Add support for SHOW ENGINES query
 2023-02-01 07:32:56 +01:00
FArthur-cmd
63e8eef9de add documentation and test 2023-02-01 02:50:53 +03:00
Dan Roscigno
2f64ba187f
Update docs/en/sql-reference/statements/alter/ttl.md 2023-01-31 14:55:13 -05:00
rfraposa
8d0908cb0f Update ttl.md 2023-01-31 11:43:09 -07:00
Dan Roscigno
9ada816d5a
Update table.md 2023-01-31 10:59:08 -05:00
Robert Schulze
325c6bdf3d
Renaming: "Query Result Cache" --> "Query Cache" 
Reasons:

- The cache will at some point store intermediate results as opposed to
  only query results. We should change the terminology now without
  having to worry about backward compat.

- Equivalent caches in MySQL (1) and Starrocks (2) are called "query
  cache".

- The new name is ca. 13.8% more catchy.

(1) https://dev.mysql.com/doc/refman/5.6/en/query-cache.html
(2) https://docs.starrocks.io/en-us/2.5/using_starrocks/query_cache
 2023-01-31 09:54:34 +00:00
Alexander Gololobov
65d39a616d Added ON CLUSTER 2023-01-30 17:02:29 +01:00
Derek Chia
692b7ab211
Update dictionary.md 
Remove "statement:" from a query
 2023-01-30 17:56:17 +08:00
freedomDR
876a92d4d1 add doc about system sync file cache. 2023-01-28 04:27:10 +00:00
Alexey Milovidov
bc2f454522
Merge branch 'master' into block-non-float-gorilla-v2 2023-01-28 03:30:12 +03:00
Alexey Milovidov
0ffc8f048b
Merge pull request #45464 from lesandie/patch-1 
Update skipping-index.md
 2023-01-28 03:27:44 +03:00
Diego Nieto
836e14e52b
Update skipping-index.md 
Deleted the confusing comment and added implemented as a mutation, like MATERIALIZE INDEX.
 2023-01-26 17:23:39 +01:00
Diego Nieto
ec378fc4d6
Merge branch 'ClickHouse:master' into patch-1 2023-01-26 17:17:35 +01:00
Dan Roscigno
b4ab361366
Merge branch 'master' into docs_optimize_skip_merged_partitions 2023-01-25 19:45:32 -05:00
Dan Roscigno
55c9b03c47
Update docs/en/sql-reference/statements/optimize.md 2023-01-25 19:45:25 -05:00
Robert Schulze
da7a657f1f
Docs: fix docs of EXPLAIN PLAN indexes=1 2023-01-25 11:02:50 +00:00
AVMusorin
5f8658b2d6
docs: added optimize_skip_merged_partitions setting 2023-01-24 14:56:39 +01:00
Robert Schulze
574cab5d7e
Remove transitory parameter 2023-01-24 11:05:29 +00:00
Robert Schulze
aaf7653108
Merge remote-tracking branch 'origin/master' into block-non-float-gorilla-v2 2023-01-24 10:14:10 +00:00
rfraposa
33770303a0 Add DISTINCT to INTERSECT and EXCEPT 2023-01-23 17:10:30 -07:00
Diego Nieto
c4266588c6
Merge branch 'master' into patch-1 2023-01-23 20:50:37 +01:00
Dan Roscigno
ee31da9e1e
Merge pull request #45366 from gingerwizard/cross-link-docs 
link docs to blogs
 2023-01-23 14:04:59 -05:00
Robert Schulze
0ab7ae6c17
Merge pull request #43797 from ClickHouse/query-result-cache 
Query result cache [experimental]
 2023-01-23 19:54:35 +01:00
Denny Crane
531ad1661e
Update column.md 2023-01-23 09:57:42 -04:00
Denny Crane
4d9be1ef4f
Update column.md 2023-01-23 09:57:04 -04:00
Denny Crane
2bf59fd48c
Update column.md 2023-01-23 09:55:30 -04:00
Robert Schulze
e6167d6b36
Deprecate Gorilla compression of non-float columns 
Reasons:

1. The original Gorilla paper proposed a compression schema for pairs of
   time stamps and double-precision FP values. ClickHouse's Gorilla
   codec only implements compression of the latter and it does not
   impose any data type restrictions.
   - Data types != Float* or (U)Int* (e.g. Decimal, Point etc.) are
     definitely not supposed to be used with Gorilla.
   - (U)Int* types are debatable. The paper only considers
     integers-stored-as-FP-values, a practical use case for which
     Gorilla works well. Standalone integers are not considered which
     makes them at least suspicious.

2. Achieve consistency with FPC, another specialized floating-point
   timeseries codec, which rejects non-float data.

3. On practical datasets, ZSTD is often "good enough" (**) so it should
   be okay to disincentive non-ZSTD codecs a little bit. If needed,
   Delta and DoubleDelta codecs are viable alternative for slowly
   changing (time-series-like) integer sequences.

Since on-prem and hosted users may still have Gorilla-compressed
non-float data, this combination is only deprecated for now. No warning
or error will be emitted. Users are encouraged to migrate
Gorilla-compressed non-float data to an alternative codec. It is planned
to treat Gorilla-compressed non-float columns as "suspicious" six months
after this commit (i.e. in v23.6). Even then, it will still be possible
to set "allow_suspicious_codecs = true" and read and write
Gorilla-compressed non-float data.

(*) Sec. 4.1.2, "Gorilla restricts the value element in its tuple to a
    double floating point type.", https://doi.org/10.14778/2824032.2824078

(**) https://clickhouse.com/blog/optimize-clickhouse-codecs-compression-schema
 2023-01-20 17:31:16 +00:00
Diego Nieto
a2b342bcbe
Update skipping-index.md 
ADD and DROP are not such lightweight command they generate mutations to deal with the changes and they will take time to complete depending on how much data the table has.
 2023-01-20 12:32:50 +01:00
Dale Mcdiarmid
9c4d3e0ffb link docs to blogs 2023-01-17 15:38:10 +00:00
Robert Schulze
099e30ef2a
Merge remote-tracking branch 'origin/master' into query-result-cache 2023-01-16 08:04:49 +00:00
Kseniia Sumarokova
db3e0219fc
Merge pull request #41687 from ClickHouse/40907_Parameterized_views_as_table_functions 
40907 Parameterized views as table functions
 2023-01-12 14:24:32 +01:00
Sergei Trifonov
1b94c839d5
Add docs for SYSTEM RELOAD USERS 2023-01-11 21:16:22 +01:00
Robert Schulze
cbc18318ff
Merge pull request #45114 from ClickHouse/less-awkward-comment-about-debugging 
Docs: Rewrite awkwardly phrased sentence about flush interval
 2023-01-10 14:15:43 +01:00
Robert Schulze
6497ddd882
Docs: Rewrite awkwardly phrased sentence about flush interval 2023-01-10 13:13:35 +00:00
Robert Schulze
0c3b034887
Merge remote-tracking branch 'origin/master' into query-result-cache 2023-01-10 09:02:41 +00:00