Impact of unfilled columns

[ats1999]

Suppose we have 50 columns in a table and data is present for only 5 column, will it create any performance issue, or size issue

[ats1999]

Nullable columns always negatively impacts performance, so we can use to substitute default values https://clickhouse.com/docs/en/cloud/bestpractices/avoid-nullable-columns

[ats1999]

Task Create a table with 50 column

• Run a query to insert into all 50 columns
• Run a query to insert into only few 10,20,25, etc..
• Measure the query execution time and run time memory

[ats1999]

It's taking extra space as compared to fewer number of columns