thevar1able/ClickHouse
1
0
Fork 0
mirror of https://github.com/ClickHouse/ClickHouse.git synced 2024-11-26 17:41:59 +00:00
Code Issues Packages Projects Releases Wiki Activity

Merge pull request #62690 from peter279k/improve_wikistat_data

Browse Source 
Add the loading data with cleaning approach
This commit is contained in:
Yarik Briukhovetskyi 2024-04-19 12:45:23 +00:00 committed by GitHub
commit 59df591ba1
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 24 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
docs/en/getting-started/example-datasets/wikistat.md
View File

@ -13,7 +13,7 @@ And the presentation: https://presentations.clickhouse.com/fosdem2023/
Data source: https://dumps.wikimedia.org/other/pageviews/
Getting the list of links:
```
``` shell
for i in {2015..2023}; do
for j in {01..12}; do
echo "${i}-${j}" >&2
@ -24,7 +24,7 @@ done | sort | uniq | tee links.txt
```
Downloading the data:
```
``` shell
sed -r 's!pageviews-([0-9]{4})([0-9]{2})[0-9]{2}-[0-9]+\.gz!https://dumps.wikimedia.org/other/pageviews/\1/\1-\2/\0!' \
links.txt | xargs -P3 wget --continue
```
@ -40,8 +40,7 @@ CREATE TABLE wikistat
project LowCardinality(String),
subproject LowCardinality(String),
path String CODEC(ZSTD(3)),
hits UInt64 CODEC(ZSTD(3)),
size UInt64 CODEC(ZSTD(3))
hits UInt64 CODEC(ZSTD(3))
)
ENGINE = MergeTree
ORDER BY (path, time);
@ -49,7 +48,7 @@ ORDER BY (path, time);
Loading the data:
```
``` shell
clickhouse-local --query "
WITH replaceRegexpOne(_path, '^.+pageviews-(\\d{4})(\\d{2})(\\d{2})-(\\d{2})(\\d{2})(\\d{2}).gz$', '\1-\2-\3 \4-\5-\6')::DateTime AS time,
extractGroups(line, '^([^ \\.]+)(\\.[^ ]+)? +([^ ]+) +(\\d+) +(\\d+)$') AS values
@ -58,9 +57,27 @@ clickhouse-local --query "
values[1] AS project,
values[2] AS subproject,
values[3] AS path,
(values[4])::UInt64 AS hits,
(values[5])::UInt64 AS size
(values[4])::UInt64 AS hits
FROM file('pageviews*.gz', LineAsString)
WHERE length(values) = 5 FORMAT Native
" | clickhouse-client --query "INSERT INTO wikistat FORMAT Native"
```
Or loading the cleaning data:
``` sql
INSERT INTO wikistat WITH
parseDateTimeBestEffort(extract(_file, '^pageviews-([\\d\\-]+)\\.gz$')) AS time,
splitByChar(' ', line) AS values,
splitByChar('.', values[1]) AS projects
SELECT
time,
projects[1] AS project,
projects[2] AS subproject,
decodeURLComponent(values[2]) AS path,
CAST(values[3], 'UInt64') AS hits
FROM s3(
'https://clickhouse-public-datasets.s3.amazonaws.com/wikistat/original/pageviews*.gz',
LineAsString)
WHERE length(values) >= 3
```