add the sample data to load for faster evaluating

[itsmesrds]

Its actually good to hav the sample data set used in the demo in repo or somewhere.

[sachinkbansal]

We can use clickhouse playground for sample data #53 (comment).

Alternatively, we can use BigQuery's public datasets
https://console.cloud.google.com/marketplace/product/obfuscated-ga360-data/obfuscated-ga360-data
https://console.cloud.google.com/marketplace/product/iowa-department-of-commerce/iowa-liquor-sales

[sachinkbansal]

BIgQuery sample query with public dataset

SELECT
date_add(PARSE_DATE('%Y%m%d', date), interval DATE_DIFF(CURRENT_DATE(), '2017-08-01',DAY) DAY) as dt,
geoNetwork.country, trafficSource.source,
SUM(totals.visits) AS visits,
SUM(totals.pageviews) AS pageviews
FROM `bigquery-public-data.google_analytics_sample.ga_sessions_*`
WHERE
_TABLE_SUFFIX BETWEEN '20160801' AND '20170731'
GROUP BY 1, 2, 3
ORDER BY 1